Maxim Markevitch <maxim % head.cfa.harvard.edu>, last change 26 Mar 10

These are ACIS background event files (particle + sky, or particle-only for
ACIS-stowed data) for imaging observations. This README describes the files
and how they were made. The accompanying COOKBOOK has suggestions on their
usage.  For general info about ACIS background, see the calibration web page
(http://cxc.harvard.edu/cal/Acis/, click on "Background", then "General
discussion"). These files (or perhaps their older versions) are also
included in CALDB (after a time lag, possible bug fixes and with filename
and some keyword changes).

The filenames contain the following info, for example:

acisi_D_01236_bg_evt_271103.fits - ACIS-I in aimpoint, period D (see below),
			     chips 0,1,2,3,6 (I0-3,S2), version 27 Nov 2003.

Files with "psu" in their names are processed by PSU CTI corrector (see
below). The particle-only background files ("stowed") are named acis_*
because there is no aciss/acisi distinction for them.

Note that CALDB uses a different naming convention: for example, a CALDB
file acis7sD2000-01-29bkgrndN00* is a copy of aciss_C_7_bg_evt* (see the
history keywords inside the headers of CALDB files for the version
correspondence). A date in the CALDB filename gives the applicability start
date of the file (the beginning of the respective A,B,C,D period), rather
than the version date as in my filenames.

- Period A is from first light until 1999-09-16. The ACIS focal plane
temperature was -100C, and the CTI of the FI chips was rapidly
increasing. The S2 file for this period is made using the early low-CTI data
and so probably not very useful.

- Period B is 1999-09-17 to 2000-01-28: t=-110C, the particle background
rate declined slowly.

- Period C is 2000-01-29 to 2000-11-30: t=-120C, the background further
declined (by about 15% during this period) apparently reaching its minimum,
see the above web page for details.

- Period D is 2000-12-01 to 2005-08-31: t=-120C, the particle background
rate started to pick up. This dataset includes ACIS-I and ACIS-S
observations in VFAINT mode (whose benefits are described in the above cal
web page, click on "Background", then "VFAINT mode").  The C/D changeover
date is rather arbitrary; both the C and D datasets are applicable around
the end of 2000.

- Period E is 2005-09-01 to now (end 2009): t=-120C, the background rate is
at the peak and is about to start declining. This dataset includes ACIS-I
and ACIS-S observations in VFAINT mode. Around mid-2005, the shape of the S3
spectrum has changed slightly w.r.t. the D period, while the FI chips have
the same spectrum, which is why we include an acis*stowed file (which
includes detector background only) combining periods D+E for FI chips.

		  HOW THESE DATASETS WERE MADE:

Each event file is a combination of several observations of relatively empty
fields (with the additional condition of |b|>20 deg and low soft Galactic
brightness in the RASS maps for periods B,C,D).  All observations were
performed using the standard timing mode, no subarrays and no gratings. 

Sources identifiable by eye were masked out in sky coordinates; observations
with large extended sources were not used.  After combining all data for
each chip into one file, sky coords and detector coords (X,Y,DETX,DETY
columns) were reset to their default no-aspect values. The TIME column was
reset to 1 for all events (this column is not removed completely to avoid
problems with some analysis software). Events in each combined file were
sorted by chip coords. In addition, for periods B,C,D, the chip coords were
randomized on the 8x8 pixel scale (taking proper care of bad pixels and
columns). These steps ensure that individual observations cannot be
extracted from the datasets and the proprietary data are protected.

Period B,C,D event files are corrected for the image holes caused by source
exclusion. The correction is performed by creating an "exposure map" in chip
coords (by convolving the source exclusion mask with the reverse aspect
track for each observation, and stacking them together).  Events from chip
areas with exposures <100% were randomly multiplied to fill the holes.  The
final exposure was set slightly below the true full exposure, and a fraction
of events from the fully exposed regions is randomly discarded, in order to
remove the shallowest holes and minimize this artificial event
multiplication.  For illustration, files ./expmaps/acisi_s3_nofill.fits and
acisi_s3_fill.fits (period D, full energy band) show chip images before and
after this correction and the subsequent coordinate randomization.  Although
this procedure slightly changes the statistical properties of the background
in the holes (unfortunately, for aciss_*_7 and acisi_*_3, the deepest holes
are near the usual aimpoints), it simplifies the analysis, and the
systematic uncertainties are dominant anyway in most cases. For user's
information, the "exposure maps" used for this correction are included in
the ./expmaps directory.

The C,D datasets are corrected for CTI using `acis_process_events
apply_cti=yes'. For periods B,C,D, there are also versions (in the directory
./psu) processed with the Penn State's CTI corrector (Townsley et al. 2000,
ApJ 534, L139).  Starting from ver. 271103 in C,D datasets, the gain time
dependence is also corrected. (In the PSU-processed files, it was corrected
from the beginning.)

Each observation was cleaned of ASCA grade 1,5,7 events (after the CTI
correction if applicable) and the background flare intervals (using
lc_clean, for details see the accompanying COOKBOOK file). The period B,C,D
files are cleaned of the cosmic ray afterglow events using the CIAO tool
`acis_detect_afterglows'. The CIAO tool `destreak' is applied to all FI
chips; it has the strongest effect on the S4 chip.

Bad pixels and columns are excluded using the respective bad pixel tables
for each time period, included in this directory.  Unlike in the archival
evt2 files, I do not exclude the columns and pixels adjacent to the true bad
columns/pixels. The status bits that would flag these adjacent events are
reset to 0, so further status filtering won't have any effect (this is to
make the background files usable for both FAINT and VFAINT data).

Please see a note on chip edge filtering (badpix* vs. badpix*noedge) in
./badpix_README.

For period D, all observations included in the datasets were performed in
VFAINT mode, and the respective status bit in the background datasets
is filled (so the datasets can be filteded by this bit for use with a
VFAINT-mode observation, or used as is for a FAINT observation).

For convenience, several chips are combined into single files (e.g.,
aciss_D_57).  Such combined files contain the same set of OBSIDs and time
periods for all included chips, to help in modeling the background flares or
a possible soft Galactic background excess or deficiency.

The combined exposures are written in the file headers as the EXPOSURE,
ONTIME and LIVETIME keywords (all equal; the DTCOR keyword is reset to 1 for
consistency), in a fake GTI extension that contains a single interval from 0
to EXPOSURE, and as keywords TSTART=0 and TSTOP=exposure, so most standard
software should have no problem determining the exposures automatically. The
keywords DATE-OBS, DATE-END correspond to the beginning of the earliest
observation in the dataset and the end of the latest one; this is
inconsistent with the dummy GTIs and may cause warnings by some software
(should this be a problem, simply remove these keywords).

Also included are two PHA files *_vfaint_bg.pha with spectra from the whole
chips I3 and S3 for period D, in PI channels, after the VFAINT mode
cleaning. They can be used for quick simulations.


		   DETAILS FOR EACH DATASET:

############################################################################
aciss_A_* (ACIS-S in aimpoint, period A), ver. 041104:

Observations used:
-----------------------
        Clean expos., s
OBSID   S2	   S3  
-----------------------
62568 	 9101	   9101
62563   31725	  29936
163     10034	   9266
164  	 9692	   9372
166  	 8351	   6239
165  	    0	   9695
-----------------------
Total   68903	  73609
-----------------------

The S3 file includes 0.3-10 keV events, while the S2 file includes 0.4-10
keV events.

Gain table used: acisD1999-08-13gainN0002

bad pixel table: badpix_AB_041104 (in this dir.; filters out chipy=1-9 pix
edges) 

File count rates (cts/s/chip):
---------------------------
E, keV       S2      S3
---------------------------
0.5  2.0    0.1170  0.2319
2.0  5.0    0.1081  0.1889
5.0 10.0    0.2291  0.6187
2.5  7.0    0.1439  0.2396
---------------------------

############################################################################
acisi_B_* (ACIS-I in aimpoint, period B), ver. 041104:

Observations used:
---------------------------------
        Clean exposures, s  R45*
OBSID   I0123,S2     S3        
---------------------------------
536          0	  49184	    100
1431A    17354	      0	    100
580      49512	      0	    100
967      57971	      0	    100
1479     20217	      0	    160
966      56782	      0	    100
1431B    94893	      0	    100
910          0	  13482	    150
---------------------------------
total   296729    62666     100
final** 250000	  55000
---------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the I exposures.
** Final adopted exposure after filling the source holes.

Light curves for FI chips were cleaned using the 0.3-12 kev band; for S3,
the 2.5-7 kev band. Deviations outside a factor of 1.2 from the respective
nominal rate were excluded.

FAINT mode only, VFAINT cleaning not applicable.

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

Gain table used: acisD1999-09-16gainN0005

No CTI or t_gain correction applied, they are not available at present.

bad pixel table: badpix_AB_041104 (in this dir.; filters out chipy=1-9 pix
edges) 

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
----------------------------------------------------------------------
 E, keV        I0      I1      I2      I3      S2      S3    I0123 avg
----------------------------------------------------------------------
 0.3 12.0    0.3947  0.4005  0.3959  0.3921  0.4328  1.5304  0.3958
 2.5  6.0    0.0709  0.0734  0.0707  0.0714  0.0787  0.1475  0.0716
 2.5  7.0    0.0929  0.0961  0.0932  0.0938  0.1025  0.1918  0.0940
 9.0 12.0    0.1373  0.1389  0.1349  0.1357  0.1509  0.8591  0.1367
10.0 12.0    0.0881  0.0889  0.0873  0.0875  0.0982  0.6289  0.0879
2500 3000    0.0913  0.0911  0.0901  0.0894  0.1031  0.7845  0.0905
 0.5  2.0    0.0694  0.0694  0.0729  0.0708  0.0837  0.1705  0.0706
 2.0  5.0    0.0674  0.0695  0.0681  0.0682  0.0766  0.1449  0.0683
 5.0 10.0    0.1550  0.1588  0.1533  0.1540  0.1625  0.5263  0.1553
----------------------------------------------------------------------

############################################################################
psu/acisi_B_*_psu, ver. 041104:

Same as acisi_B_* without "psu" above, except that Penn State CTI corrector
is applied to recalculate PHA, PI, ENERGY and GRADE values (grade filtering
is applied after the corrector.)

bad pixel table: badpix_AB_041104 (in this dir.; filters out chipy=1-9 pix
edges) 

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
-------------------------------------
 E, keV      I0123      S2      S3
-------------------------------------
 0.3 12.0    0.3956  0.4295  1.6980
 2.5  6.0    0.0736  0.0812  0.1536
 2.5  7.0    0.0962  0.1056  0.2019
 9.0 12.0    0.1357  0.1480  0.9857
10.0 12.0    0.0857  0.0945  0.7232
2500 3000    0.0867  0.0955  0.8912
 0.5  2.0    0.0675  0.0781  0.1732
 2.0  5.0    0.0701  0.0779  0.1481
 5.0 10.0    0.1576  0.1645  0.5939         
-------------------------------------

############################################################################
aciss_B_* (ACIS-S in aimpoint, period B), ver. 041104:

Observations used:
-----------------------------------
       Clean exposures, s      R45*
OBSID  I23,S24     S3     S1
-----------------------------------
1423         0      0  11408   130
1458      9593   7259      0   140
 631         0      0  15930   130
 325     97463  78006      0   110
 765     35521  30076      0   170
 870     24113  23853      0   100
 839     18927  16593      0   130
 804         0      0  36299   115
 767     17621  16584      0   110
-----------------------------------
total   203238 172371  63637   120
final** 165000 145000  55000
-----------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the I exposures.
** Final adopted exposure after filling the source holes.

Light curves for FI chips were cleaned using the 0.3-12 kev band; for S3,
the 2.5-7 kev band; for S1, the 2.5-6 kev band. Deviations outside a factor
of 1.2 from the respective nominal rate were excluded.

FAINT mode only, VFAINT cleaning not applicable.

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

Gain: acisD1999-09-16gainN0005 (from CALDB)

No CTI or t_gain correction applied, they are not available at present.

bad pixel table: badpix_AB_041104 (in this dir.; filters out chipy=1-9 pix
edges) 

Datasets for chips I23,S234 (aciss_B_2368 and aciss_B_7) are made from the
same set of observations (although each observation has a different weight
in the FI and BI datasets, due to those chips' different sensitivity to
flares). This is so that one can try using the outlying chips to model the
soft Galactic excess/deficiency in a given observation w.r.t these
background files.

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
------------------------------------------------------------
 E, keV	       I2      I3      S1      S2      S3      S4
------------------------------------------------------------
 0.3 12.0    0.3975  0.3907  2.2413  0.4327  1.4400  0.4424
 2.5  6.0    0.0723  0.0709  0.1449  0.0774  0.1308  0.0750
 2.5  7.0    0.0948  0.0933  0.2495  0.1006  0.1742  0.0991
 9.0 12.0    0.1362  0.1357  1.1348  0.1510  0.8167  0.1508
10.0 12.0    0.0885  0.0873  0.7638  0.0984  0.5993  0.0977
2500 3000    0.0912  0.0891  0.7640  0.1034  0.7480  0.1043
 0.5  2.0    0.0739  0.0710  0.1662  0.0846  0.1569  0.0944
 2.0  5.0    0.0695  0.0676  0.1324  0.0750  0.1292  0.0722
 5.0 10.0    0.1526  0.1537  1.0344  0.1627  0.4985  0.1632
------------------------------------------------------------

############################################################################
psu/aciss_B_*_psu, ver. 041104:

Same as aciss_B_* without "psu" above, except that Penn State CTI corrector
is applied to recalculate PHA, PI, ENERGY and GRADE values (grade filtering
is applied after the corrector.)

bad pixel table: badpix_AB_041104 (in this dir.; filters out chipy=1-9 pix
edges) 

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
--------------------------------------------
 E, keV	       I2      I3      S2      S3
--------------------------------------------
 0.3 12.0    0.3952  0.3898  0.4292  1.5908
 2.5  6.0    0.0738  0.0729  0.0800  0.1383
 2.5  7.0    0.0963  0.0955  0.1042  0.1855
 9.0 12.0    0.1331  0.1338  0.1464  0.9325
10.0 12.0    0.0851  0.0846  0.0937  0.6847
2500 3000    0.0867  0.0847  0.0947  0.8493
 0.5  2.0    0.0714  0.0670  0.0796  0.1582
 2.0  5.0    0.0708  0.0698  0.0766  0.1349
 5.0 10.0    0.1537  0.1550  0.1641  0.5565
--------------------------------------------

############################################################################
Files acisi_C_* (ACIS-I in aimpoint, period C),  ver. 070707:

Observations used:
---------------------------------------
       Clean exposures,s     N_H,  R45
OBSID   I0123,S2    S3	     1e20   *
---------------------------------------
 957      58072      0       1.49  105
1708      52883  10889       2.65  100
 927     125472  41145       2.65  100
 441      54445      0       0.90  120
 582     127460      0       0.90  120
 887      74141      0       1.07  130
 888      70524      0       1.35  140
 915      77777  62745       5.48  140
---------------------------------------
total    640774 114779             120
final**  450000 100000
---------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the I exposures.
** Final adopted exposure after filling the source holes.

Light curves for FI chips were cleaned using the 0.3-12 kev band; for S3,
the 2.5-7 kev band. Deviations outside a factor of 1.2 from the respective
nominal rate were excluded.

FAINT mode only, VFAINT cleaning not applicable.

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_C_041104noedge (in this dir.)

t_gain correction is applied to the PHA (as well as PI and ENERGY) values,
so one can reapply a different gain table if needed (by running
acis_process_events) without losing the tgain correction.

File count rates (cts/s/chip) in various energy bands:
--------------------------------------------------------------------
  E, keV      I0       I1     I2      I3      S2      S3      I0123  
--------------------------------------------------------------------
 0.3 12.0    0.3415  0.3497  0.3434  0.3519  0.3833  1.2499  0.3466
 2.5  7.0    0.0810  0.0820  0.0814  0.0835  0.0903  0.1430  0.0820
 9.0 12.0    0.1232  0.1261  0.1206  0.1263  0.1363  0.6967  0.1241
 9.5 12.0    0.1089  0.1117  0.1066  0.1119  0.1205  0.6180  0.1098
10.0 12.0    0.0776  0.0800  0.0765  0.0800  0.0865  0.5093  0.0785
 0.5  2.0    0.0550  0.0573  0.0581  0.0570  0.0682  0.1414  0.0569
 2.0  5.0    0.0577  0.0582  0.0591  0.0594  0.0669  0.1088  0.0586
 5.0 10.0    0.1388  0.1408  0.1363  0.1431  0.1478  0.4205  0.1398
--------------------------------------------------------------------

############################################################################
psu/acisi_C_*_psu, ver. 010205:

Same as acisi_C_* without "psu" above, except that Penn State CTI corrector
is applied (instead of `acis_process_events') to recalculate PHA, PI, ENERGY
and GRADE values (grade filtering is applied after the corrector.)

FAINT mode only, VFAINT cleaning not applicable.

bad pixel table: badpix_C_041104noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
-----------------------------------
  E, keV     I0123     S2      S3
-----------------------------------
 0.3 12.0    0.3474  0.3837  1.3161
 2.5  6.0    0.0624  0.0697  0.1129
 2.5  7.0    0.0822  0.0908  0.1479
 9.0 12.0    0.1241  0.1361  0.7658
10.0 12.0    0.0784  0.0862  0.5625
2500 3000    0.0795  0.0883  0.6945
 0.5  2.0    0.0566  0.0677  0.1404
 2.0  5.0    0.0589  0.0671  0.1122
 5.0 10.0    0.1398  0.1484  0.4522          
-----------------------------------

############################################################################
Files aciss_C_* (ACIS-S in aimpoint, period C), ver. 070707:

------------------------------------------------------
                 Clean exposures, s         N_H,  R45*
OBSID  	  I1  I23,S2    S1     S3     S4    1e20    
------------------------------------------------------
 809    44589  44589      0  32147      0   1.09  140
 861    21779  21779      0   5704  21779   3.79  110
 326        0  42000  15556  15556  42000   4.29  190
 431    20223  20223      0  19705  20223   5.43   90
1031        0  38373  15038  15038  38373   1.26  100
2126        0  23335  23853  23853  23335   1.18  110
------------------------------------------------------
total   86591 190299  54447 112003 145710         125
final** 86000 180000  54000 110000 140000
------------------------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the S3 exposures.
** Final adopted exposure after filling the source holes.

Light curves for FI chips were cleaned using the 0.3-12 kev band; for S3,
the 2.5-7 kev band; for observations with both S1 and S3, the 2.5-6 kev
band. Deviations outside a factor of 1.2 from the respective nominal rate
were excluded.

FAINT mode only, VFAINT cleaning not applicable.

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_C_041104noedge (in this dir.)

Datasets for chips I23,S23 (aciss_C_236 and aciss_C_7) are made from the
same set of observations (although each observation has a different weight
in the FI and BI datasets, due to those chips' different sensitivity to
flares). This is so that one can try using the outlying chips to model the
soft Galactic excess/deficiency in a given observation w.r.t these
background files. A subset of the S3 data that uses only observations with
both S1 and S3 chips (aciss_C_57) is also included for the same purpose and
for flare modeling.

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
----------------------------------------------------------------------------
  E, keV       I1      I2      I3     S1      S2      S3     S3_57     S4
----------------------------------------------------------------------------
 0.3 12.0    0.3609  0.3476  0.3508  2.0196  0.3864  1.3559  1.3307  0.4087
 2.5  6.0    0.0662  0.0611  0.0631  0.1288  0.0688  0.1174  0.1109  0.0673
 2.5  7.0    0.0868  0.0808  0.0829  0.2191  0.0900  0.1563  0.1482  0.0880
 9.0 12.0    0.1297  0.1207  0.1234  1.0729  0.1366  0.7802  0.7633  0.1314
 9.5 12.0    0.1143  0.1062  0.1090  0.9072  0.1198  0.6950  0.6788  0.1157
10.0 12.0    0.0825  0.0762  0.0784  0.7178  0.0869  0.5732  0.5589  0.0830
2500 3000    0.0817  0.0792  0.0783  0.7275  0.0882  0.7082  0.6866  0.0903
 0.5  2.0    0.0591  0.0624  0.0610  0.1449  0.0712  0.1414  0.1455  0.0934
 2.0  5.0    0.0610  0.0580  0.0599  0.1170  0.0664  0.1136  0.1078  0.0641
 5.0 10.0    0.1462  0.1378  0.1400  0.9519  0.1484  0.4662  0.4556  0.1436
----------------------------------------------------------------------------

############################################################################
nocti/aciss_C_*_bg_nocti_evt_070707:

Same as aciss_C_*_bg_evt_070707, but without the CTI correction for either
FI or BI chips. These may be helpful for observations in Graded mode.

gain, t_gain are ver. N0005 from CALDB.

############################################################################
psu/aciss_C_*_psu, ver. 010205:

Same as aciss_C_* without "psu" (see above), except that Penn State CTI
corrector is applied (instead of `acis_process_events') to recalculate PHA,
PI, ENERGY and GRADE values (grade filtering is applied after the
corrector.)

The file *_57_* combines the uncorrected S1 data (same as in aciss_C above)
and the subset of the PSU-corrected S3 data from the same OBSIDs, see notes
above.

FAINT mode only, VFAINT cleaning not applicable.

bad pixel table: badpix_C_041104noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
------------------------------------------------------------
  E, keV       I1      I2      I3     S2      S3     S3_57
------------------------------------------------------------
 0.3 12.0    0.3605  0.3486  0.3519  0.3886  1.3495  1.3239
 2.5  6.0    0.0660  0.0615  0.0635  0.0695  0.1182  0.1118
 2.5  7.0    0.0869  0.0810  0.0835  0.0909  0.1575  0.1498
 9.0 12.0    0.1295  0.1202  0.1235  0.1368  0.7864  0.7692
10.0 12.0    0.0825  0.0758  0.0784  0.0870  0.5770  0.5626
2500 3000    0.0817  0.0780  0.0785  0.0881  0.7060  0.6830
 0.5  2.0    0.0576  0.0628  0.0603  0.0707  0.1402  0.1448
 2.0  5.0    0.0608  0.0580  0.0605  0.0669  0.1146  0.1085
 5.0 10.0    0.1462  0.1380  0.1409  0.1491  0.4723  0.4601
------------------------------------------------------------

############################################################################
acisi_D_* (ACIS-I in aimpoint, period D), version 300407:

-------------------------------------------------------
                   Clean exposures, s	     N_H,  R45*
OBSID  	  date	   I0123,S2    S3     S4     1e20
-------------------------------------------------------
2252   2001-01-06    72076   72595       0   2.67  130
2240   2001-01-26    27221   18664       0   3.03  110
2452   2001-04-24    65594       0       0   2.10  100
2228   2001-05-04   111801       0       0   1.10  110
2254   2001-05-18        0   80748       0   1.33  130
2235   2001-06-08    30076       0   30076   0.85  120
2236   2001-06-08    29039       0   29039   0.83  120
2237   2001-06-09    29810       0   29810   0.85  120
3130   2002-04-16   108097   79128       0   1.12  150
3346   2002-04-30    38366   35255       0   0.57   95
3347   2002-05-02    38885   37329       0   0.57   95
3348   2002-05-04    39896   39378       0   0.57   95
3482   2002-06-09    50037   34221       0   1.12  150
3307   2002-06-23    29554       0       0   2.79   90
4275   2003-06-08    28002       0       0   2.76   90
4129   2003-06-13   138920       0       0   2.19   90
4497   2004-03-15    65850       0       0  13.80  100
5024   2004-08-23    46706       0       0   0.65   90
5025   2004-08-23    69999       0       0   0.66   90
5026   2004-08-23    68968       0       0   0.66   90
5027   2004-08-23    50297       0       0   0.69   90
5029   2004-08-30    68443       0       0   0.71   90
5030   2004-08-30    65850       0       0   0.72   90
5031   2004-08-30    65325       0       0   0.72   90
5021   2004-11-13    96304       0       0   0.92  100
5020   2004-11-15    77771       0       0   0.93  100
5022   2004-11-15    79333       0       0   0.92  100
5019   2004-11-17   164895       0       0   0.93  100
6164   2004-11-20    67925       0       0   0.92  100
-------------------------------------------------------
total              1825040  397318   88925         105
final**		   1500000  340000   88000
-------------------------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the I exposures.
** Final adopted exposure after filling the source holes.

All of the included observations were performed in VFAINT mode, which
enables additional background filtering. Files were processed with
`acis_process_events check_vf_pha=yes' with default settings, which fills
the corresponding status bit for each event. Be careful not to overwrite
this bit if you have to rerun acis_process_events for any reason.

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_D_041104noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
--------------------------------------------------------------------------
  E, keV     I0      I1      I2      I3      S2      S3      S4      I0123
--------------------------------------------------------------------------
NO VFAINT FILTERING:
 0.3 12.0    0.3874  0.3989  0.3928  0.4035  0.4249  1.3755  0.4020  0.3956
 2.5  6.0    0.0700  0.0718  0.0707  0.0730  0.0772  0.1128  0.0694  0.0714
 2.5  7.0    0.0924  0.0946  0.0932  0.0966  0.1012  0.1509  0.0910  0.0942
 9.0 12.0    0.1445  0.1483  0.1418  0.1487  0.1572  0.8226  0.1390  0.1458
 9.5 12.0    0.1282  0.1313  0.1255  0.1315  0.1388  0.7323  0.1217  0.1291
10.0 12.0    0.0918  0.0941  0.0902  0.0947  0.1006  0.6039  0.0883  0.0927
2500 3000    0.0943  0.0938  0.0926  0.0950  0.1023  0.7512  0.0975  0.0940
 0.5  2.0    0.0582  0.0607  0.0627  0.0616  0.0699  0.1237  0.0781  0.0608
 2.0  5.0    0.0660  0.0674  0.0673  0.0687  0.0744  0.1089  0.0664  0.0674
 5.0 10.0    0.1588  0.1639  0.1590  0.1663  0.1676  0.4827  0.1532  0.1620
--------------------------------------------------------------------------
WITH VFAINT FILTERING:
 0.3 12.0    0.2712  0.2785  0.2758  0.2782  0.2981  1.1451  0.2695  0.2759
 2.5  6.0    0.0614  0.0628  0.0623  0.0638  0.0682  0.1007  0.0600  0.0626
 2.5  7.0    0.0778  0.0796  0.0790  0.0808  0.0860  0.1298  0.0759  0.0793
 9.0 12.0    0.0887  0.0907  0.0880  0.0886  0.0953  0.6949  0.0819  0.0890
 9.5 12.0    0.0795  0.0811  0.0786  0.0790  0.0848  0.6188  0.0722  0.0796
10.0 12.0    0.0513  0.0524  0.0512  0.0511  0.0554  0.5075  0.0472  0.0515
2500 3000    0.0563  0.0526  0.0582  0.0530  0.0607  0.6146  0.0485  0.0550
 0.5  2.0    0.0407  0.0424  0.0427  0.0427  0.0495  0.1095  0.0494  0.0421
 2.0  5.0    0.0593  0.0606  0.0603  0.0617  0.0668  0.1016  0.0586  0.0605
 5.0 10.0    0.1142  0.1172  0.1157  0.1173  0.1200  0.4014  0.1063  0.1161
--------------------------------------------------------------------------

############################################################################
psu/acisi_D_*_psu, ver. 010205:

A subset of the above acisi_D including data up to 2002-06-09 (see above;
exposures are 550000 s for FI files and 340000 s for S3).  Penn State CTI
corrector is applied (instead of `acis_process_events') to recalculate PHA,
PI, ENERGY and GRADE values (grade filtering is applied after the
corrector.)

VFAINT status bit filled as above.

bad pixel table: badpix_D_041104noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
------------------------------------
  E, keV     I0123     S2      S3
------------------------------------
NO VFAINT FILTERING:
 0.3 12.0    0.3596  0.3951  1.3726
 2.5  6.0    0.0649  0.0722  0.1135
 2.5  7.0    0.0852  0.0943  0.1521
 9.0 12.0    0.1303  0.1431  0.8338
10.0 12.0    0.0825  0.0910  0.6115
2500 3000    0.0832  0.0926  0.7503
 0.5  2.0    0.0576  0.0680  0.1230
 2.0  5.0    0.0611  0.0692  0.1096
 5.0 10.0    0.1455  0.1538  0.4903
------------------------------------

############################################################################
aciss_D_* (ACIS-S in aimpoint, period D), ver. 030507:

-----------------------------------------------------------
                              Clean exposures, s       R45*
obsid  	  date        I1  I23,S2    S1    S3	   S4  
-----------------------------------------------------------
2221   2001-11-01       0  37854      0  34224  37854  125
2579   2001-12-07       0  64035      0  51852      0  100
2486   2001-12-24       0  22816  19705  19705  22816  110
3419   2002-01-08   94374  94374      0  91263      0   90
3445   2002-02-25   70524  70524      0  70524      0  120
3207   2002-02-27  121602 121602      0 114083      0  120
2518   2002-08-07       0  29817  29039  29039  29817  150
4409   2002-11-25       0  25409  22816  22816  25409  130
3140   2002-12-02       0  29557  28002  28002      0  140
3759   2003-03-03       0  50559  49781  49781      0  130
3461   2003-09-21       0  30076  23853  23853      0  120
3460   2003-10-07       0  30335  24890  24890      0  130
------------------------------------------------------------------
total		   286500 606958 198086 560032 115896  120
final**		   220000 500000 170000 450000 100000
--------------------------------------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the S3 exposures.
** Final adopted exposure after filling the source holes.

Processing exactly the same as acisi_D (including the VFAINT status bit),
see above.

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_D_041104noedge (in this dir.)

Datasets aciss_D_236 and aciss_D_7 are made from the same set of
observations; aciss_D_57 includes S1 events and a subset of the S3 data only
from observations with both S1 and S3 chips (see notes for aciss_C).

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
---------------------------------------------------------------------------
  E, keV       I1      I2      I3    S1_57     S2      S3     S3_57    S4
---------------------------------------------------------------------------
NO VFAINT CLEANING:
 0.3 12.0    0.3691  0.3603  0.3711  2.1921  0.3962  1.4086  1.4048  0.5129
 2.5  6.0    0.0669  0.0648  0.0667  0.1309  0.0715  0.1162  0.1156  0.0707
 2.5  7.0    0.0880  0.0854  0.0880  0.2300  0.0939  0.1553  0.1546  0.0916
 9.0 12.0    0.1350  0.1293  0.1351  1.1931  0.1459  0.8416  0.8349  0.1437
 9.5 12.0    0.1200  0.1145  0.1194  1.0089  0.1282  0.7489  0.7422  0.1261
10.0 12.0    0.0860  0.0826  0.0861  0.8023  0.0930  0.6188  0.6132  0.0916
2500 3000    0.0854  0.0843  0.0863  0.8195  0.0947  0.7684  0.7616  0.0976
 0.5  2.0    0.0591  0.0589  0.0597  0.1375  0.0662  0.1280  0.1300  0.1462
 2.0  5.0    0.0633  0.0617  0.0630  0.1184  0.0682  0.1119  0.1108  0.0690
 5.0 10.0    0.1493  0.1447  0.1511  1.0420  0.1572  0.4921  0.4909  0.1503
---------------------------------------------------------------------------
VFAINT-CLEAN:
 0.3 12.0    0.2600  0.2527  0.2579  1.8887  0.2767  1.1710  1.1660  0.2968
 2.5  6.0    0.0591  0.0569  0.0588  0.1190  0.0628  0.1036  0.1029  0.0600
 2.5  7.0    0.0748  0.0722  0.0742  0.2079  0.0796  0.1333  0.1323  0.0754
 9.0 12.0    0.0827  0.0794  0.0807  1.0422  0.0877  0.7103  0.7040  0.0878
 9.5 12.0    0.0741  0.0709  0.0718  0.8764  0.0774  0.6324  0.6264  0.0776
10.0 12.0    0.0477  0.0461  0.0466  0.6906  0.0507  0.5200  0.5151  0.0513
2500 3000    0.0479  0.0523  0.0481  0.6824  0.0556  0.6293  0.6227  0.0505
 0.5  2.0    0.0420  0.0404  0.0421  0.1175  0.0472  0.1130  0.1153  0.0621
 2.0  5.0    0.0573  0.0552  0.0567  0.1111  0.0608  0.1042  0.1030  0.0585
 5.0 10.0    0.1078  0.1053  0.1073  0.9439  0.1118  0.4083  0.4067  0.1068
---------------------------------------------------------------------------

############################################################################
nocti/aciss_D_*_bg_nocti_evt_080707:

Same as aciss_D_*_bg_evt_030507, but without the CTI correction for either
FI or BI chips. These may be helpful for observations in Graded mode.

gain, t_gain are ver. N0005 from CALDB.

############################################################################
psu/aciss_D_*_psu, ver. 010205:

Same as aciss_D_* without "psu" (see above), except that Penn State CTI
corrector is applied (instead of `acis_process_events') to recalculate PHA,
PI, ENERGY and GRADE values (grade filtering is applied after the
corrector.)

The file *_57_* combines the uncorrected S1 data (same as in aciss_C above)
and the subset of the PSU-corrected S3 data from the same OBSIDs, see notes
above.

VFAINT status bit filled as above.

bad pixel table: badpix_D_041104noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
------------------------------------------------------------
  E, keV       I1      I2      I3      S2      S3     S3_57
------------------------------------------------------------
NO VFAINT CLEANING:
 0.3 12.0    0.3730  0.3598  0.3734  0.3999  1.4043  1.4059
 2.5  6.0    0.0677  0.0646  0.0674  0.0725  0.1169  0.1172
 2.5  7.0    0.0890  0.0848  0.0890  0.0952  0.1568  0.1570
 9.0 12.0    0.1356  0.1283  0.1361  0.1469  0.8511  0.8486
10.0 12.0    0.0863  0.0822  0.0869  0.0938  0.6247  0.6231
2500 3000    0.0860  0.0819  0.0865  0.0950  0.7685  0.7671
 0.5  2.0    0.0581  0.0588  0.0589  0.0654  0.1271  0.1302
 2.0  5.0    0.0639  0.0616  0.0635  0.0690  0.1124  0.1122
 5.0 10.0    0.1512  0.1433  0.1524  0.1585  0.5010  0.5005
------------------------------------------------------------

############################################################################
acis_D_0123567_stowed_evt_280807.fits:

This is ACIS in the stowed position inside the detector housing with HRC
exposed to the sky. The sky background component is blocked. See
http://cxc.harvard.edu/contrib/maxim/stowed/ for details and comparison to
the dark Moon data.

-------------------------------------
date       obsid   Clean exposures, s
		   023567
-------------------------------------
2002-09-03 62850   52893
2003-05-04 62848   47957
2003-12-08 62846   46135
2004-11-04 62836   46411
2005-06-10 62831   47448

total		  235000 (see below)
-------------------------------------

The telemetry mode is VFAINT, the corresp. status bit filled (see notes
above).

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

t_gain, gain, CTI files: ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_D_041104noedge (in this dir.)

Note on chip I1:

Chips 023567 were exposed; I1 was off due to the 6-chip limit.  The I1
background is known to be sufficiently similar to I0 (at least for E>0.7
kev), apart from a 3% difference in normalization, of which 1% is a
geometric factor due to the different number of bad columns.  For
convenience, the combined dataset here includes fake I1 events.  They are
copies of the I0 events, with the I0 bad columns filled randomly with events
from nearby columns, the CHIPX coordinate flipped, and the I1 bad columns
masked out. The exposure for other chips was reduced by 2% (by throwing out
events) to obtain proper normalization for the I1 background and at the same
time keep the same exposure for all chips.  Note that gains for I0 and I1
are different, so PI and ENERGY columns for the fake I1 events are correct
but PHA values are not. This means that acis_process_events SHOULD NOT be
applied to update the PI column in these files (of course if one doesn't
need I1 then there is no such problem).

File count rates (cts/s/chip) in various energy bands:
--------------------------------------------
 E,keV	     I0123   S1      S2	     S3
--------------------------------------------
NO VFAINT FILTERING:
 0.3 12.0    0.3695  2.3303  0.3997  1.4587
 2.5  6.0    0.0655  0.1378  0.0715  0.1160
 2.5  7.0    0.0872  0.2433  0.0946  0.1565
 9.0 12.0    0.1426  1.2980  0.1569  0.9068
 9.5 12.0    0.1264  1.1001  0.1384  0.8084
10.0 12.0    0.0906  0.8745  0.1004  0.6684
2500 3000    0.0930  0.8898  0.1020  0.8340
 0.5  2.0    0.0490  0.1143  0.0536  0.1017
 2.0  5.0    0.0616  0.1223  0.0687  0.1120
 5.0 10.0    0.1569  1.1287  0.1663  0.5223
--------------------------------------------
VFAINT-CLEANED: 
 0.3 12.0    0.2533  2.0035  0.2713  1.2056
 2.5  6.0    0.0570  0.1250  0.0621  0.1027
 2.5  7.0    0.0729  0.2196  0.0791  0.1335
 9.0 12.0    0.0869  1.1353  0.0940  0.7680
 9.5 12.0    0.0778  0.9570  0.0836  0.6850
10.0 12.0    0.0501  0.7548  0.0545  0.5635
2500 3000    0.0553  0.7450  0.0598  0.6859
 0.5  2.0    0.0308  0.0934  0.0340  0.0859
 2.0  5.0    0.0549  0.1143  0.0606  0.1038
 5.0 10.0    0.1126  1.0222  0.1171  0.4348
--------------------------------------------

############################################################################
acis_E_0123567_stowed_evt_110210.fits:

This is ACIS in the stowed position inside the detector housing with HRC
exposed to the sky. The sky background component is blocked. See
http://cxc.harvard.edu/contrib/maxim/stowed/ for details and comparison to
the dark Moon data.

-------------------------------------
date       obsid   Clean exposures, s
		   023567
-------------------------------------
62824   2005-11-13   47188
62823   2006-06-01   44596
62819   2006-11-18   47448
62816   2007-05-28   46411
62815	2007-11-08   46660
62814	2008-07-26   48485
62813	2008-11-03   49003
62812	2009-06-18   33187
62811	2009-06-19   12445

total		    367000 (see below)
-------------------------------------

The telemetry mode is VFAINT, the corresp. status bit filled (see notes
above).

The upper event PHA cutoff is 3275 ADU (approx. 13 kev).

t_gain, gain, CTI files: ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_D_041104noedge (in this dir.)

Note on chip I1: see note for acis_D_*stowed* above.

File count rates (cts/s/chip) in various energy bands:
--------------------------------------------
 E,keV	     I0123   S1      S2	     S3
--------------------------------------------
NO VFAINT FILTERING:
 0.3 12.0    0.5346  3.3488  0.5847  2.0757
 2.5  6.0    0.0954  0.2022  0.1053  0.1752
 2.5  7.0    0.1271  0.3493  0.1394  0.2349
 9.0 12.0    0.2051  1.8668  0.2311  1.2608
 9.5 12.0    0.1825  1.5877  0.2048  1.1244
10.0 12.0    0.1310  1.2650  0.1491  0.9295
2500 3000    0.1338  1.3148  0.1512  1.1864
 0.5  2.0    0.0697  0.1762  0.0772  0.1544
 2.0  5.0    0.0898  0.1827  0.1004  0.1694
 5.0 10.0    0.2269  1.5851  0.2427  0.7359
--------------------------------------------
VFAINT-CLEANED: 
 0.3 12.0    0.3619  2.8557  0.3945  1.7067
 2.5  6.0    0.0828  0.1837  0.0910  0.1560
 2.5  7.0    0.1058  0.3157  0.1155  0.2018
 9.0 12.0    0.1222  1.6280  0.1369  1.0663
 9.5 12.0    0.1099  1.3769  0.1222  0.9514
10.0 12.0    0.0706  1.0880  0.0803  0.7824
2500 3000    0.0778  1.0967  0.0878  0.9746
 0.5  2.0    0.0436  0.1404  0.0495  0.1291
 2.0  5.0    0.0795  0.1706  0.0880  0.1571
 5.0 10.0    0.1612  1.4312  0.1693  0.6123
--------------------------------------------

(version 110210 differs from the earlier 060909 only by exclusion of a
couple of additional faint bad pixels, which practically did not affect
rates).

############################################################################
acis_DE_01236_stowed_evt_110210.fits:

This is a combination of the above acis_stowed for periods D and E for the
FI chips. The spectral shape for these chips has stayed constant through D
and E, so it is possible to combine them. (For chips S1 and especially S3,
the spectral shape has changed by up to 10%.)

total exposure: 603000 s

File count rates (cts/s/chip) in various energy bands:
----------------------------
 E,keV	     I0123   S2
----------------------------
NO VFAINT FILTERING:
 0.3 12.0    0.4699  0.5123
 2.5  6.0    0.0837  0.0922
 2.5  7.0    0.1114  0.1220
 9.0 12.0    0.1807  0.2020
 9.5 12.0    0.1606  0.1787
10.0 12.0    0.1152  0.1300
2500 3000    0.1178  0.1319
 0.5  2.0    0.0616  0.0680
 2.0  5.0    0.0787  0.0880
 5.0 10.0    0.1995  0.2128
----------------------------
VFAINT-CLEANED: 
 0.3 12.0    0.3194  0.3464
 2.5  6.0    0.0726  0.0798
 2.5  7.0    0.0929  0.1013
 9.0 12.0    0.1084  0.1201
 9.5 12.0    0.0974  0.1071
10.0 12.0    0.0626  0.0702
2500 3000    0.0690  0.0769
 0.5  2.0    0.0386  0.0435
 2.0  5.0    0.0698  0.0773
 5.0 10.0    0.1422  0.1489
----------------------------

(version 110210 differs from the earlier 060909 only by exclusion of a
couple of additional faint bad pixels, which practically did not affect
rates).

############################################################################
psu/acis_D_012367_stowed_psu_evt_041104.fits:

A subset of the *stowed* file without "psu" (see above) including only first
3 observations. The Penn State CTI corrector is applied (instead of
`acis_process_events') to recalculate PHA, PI, ENERGY and GRADE values
(grade filtering is applied after the corrector.)

-------------------------------------
date       obsid   Clean exposures, s
		   023567
-------------------------------------
2002-09-03 62850   52893
2003-05-04 62848   46983
2003-12-08 62846   46135
total		  144000
-------------------------------------

bad pixel table: badpix_D_041104 (same as badpix_D_041104noedge, but also
filters out chipy=1-9 edges for all chips)

The file has the following count rates (cts/s/chip) in different energy
bands (2500-3000 is a PHA band):
------------------------------------
  E, keV     I0123*  S2      S3 
------------------------------------
VFAINT-CLEANED: 
 0.3 12.0    0.2244  0.2415  1.1013
 2.5  6.0    0.0515  0.0561  0.0928
 2.5  7.0    0.0655  0.0714  0.1205
 9.0 12.0    0.0757  0.0829  0.7045
10.0 12.0    0.0435  0.0474  0.5146
2500 3000    0.0475  0.0521  0.6194
 0.5  2.0    0.0276  0.0303  0.0771
 2.0  5.0    0.0496  0.0544  0.0936
 5.0 10.0    0.0990  0.1046  0.4019
------------------------------------

############################################################################
aciss_E_* (ACIS-S in aimpoint, period E), ver. 110210:

----------------------------------------------
                   Clean exposures, s    R45*
obsid  	  date     I23,S123 S4  
----------------------------------------------
6879  2006.06.02   59116   59116	 145
7440  2006.12.12   47967   47967	 120
9368  2007.11.23   73376   0		 100
8902  2007.12.22   40966   0		 100
9086  2007.12.26   27224   0		 140
9802  2007.12.29   19187   0		 140
9087  2008.04.30   32669   0		 140
9811  2008.05.01   30595   0		 140
9812  2008.05.03   26187   0		 140
9813  2008.05.04   26187   0		 140
10303 2009.01.08   60140   60140	  90
11721 2009.08.20   63264   0		 140
9925  2009.09.15   37336   37336	 140
----------------------------------------------
total		  544214   204559	 125
final**		  450000   160000
----------------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the S3 exposures.
** Final adopted exposure after filling the source holes.

Processing exactly the same as acisi_D (including the VFAINT status bit),
see above.

The event readout PHA range (pha_ro) is 38-3270 ADU (upper end approx. 13
kev).

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_E_110210noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
---------------------------------------------------------------------------
  E, keV       I2      I3      S1      S2      S3     S4
---------------------------------------------------------------------------
NO VFAINT CLEANING:
 0.3 12.0    0.5661  0.5763  3.4273  0.6087  2.1467  0.6346
 2.5  6.0    0.1019  0.1042  0.2103  0.1112  0.1856  0.1058
 2.5  7.0    0.1347  0.1373  0.3599  0.1460  0.2468  0.1402
 9.0 12.0    0.2079  0.2168  1.8898  0.2326  1.2817  0.2254
 9.5 12.0    0.1838  0.1920  1.6074  0.2051  1.1424  0.1984
10.0 12.0    0.1320  0.1390  1.2828  0.1487  0.9447  0.1434
2500 3000    0.1351  0.1393  1.3322  0.1513  1.2057  0.1555
 0.5  2.0    0.0850  0.0819  0.2004  0.0893  0.1789  0.1183
 2.0  5.0    0.0976  0.0992  0.1925  0.1068  0.1792  0.1018
 5.0 10.0    0.2329  0.2398  1.6034  0.2473  0.7499  0.2403
---------------------------------------------------------------------------
VFAINT-CLEAN:
 0.3 12.0    0.3846  0.3941  2.9095  0.4174  1.7645  0.4046
 2.5  6.0    0.0883  0.0906  0.1909  0.0970  0.1656  0.0910
 2.5  7.0    0.1121  0.1147  0.3248  0.1227  0.2124  0.1159
 9.0 12.0    0.1234  0.1280  1.6391  0.1378  1.0818  0.1332
 9.5 12.0    0.1100  0.1143  1.3865  0.1222  0.9644  0.1178
10.0 12.0    0.0710  0.0742  1.0970  0.0800  0.7934  0.0766
2500 3000    0.0813  0.0768  1.1048  0.0876  0.9872  0.0747
 0.5  2.0    0.0549  0.0553  0.1628  0.0610  0.1523  0.0610
 2.0  5.0    0.0860  0.0880  0.1798  0.0946  0.1663  0.0887
 5.0 10.0    0.1653  0.1693  1.4421  0.1739  0.6230  0.1673
---------------------------------------------------------------------------

############################################################################
acisi_E_* (ACIS-I in aimpoint, period E), ver. 201209:

-----------------------------------------
                   Clean exp., s   R45*
obsid  	  date     I0123,S2 S3
-----------------------------------------
 6216  2005.09.20  50037    0      120
 6217  2005.09.23  50031    0      120
 6219  2005.09.25  50037    0      120
 5854  2005.09.30  50559    0      140
 5849  2005.10.11  50037    0      120
 6791  2006.09.28 101875   100600  140
 8012  2007.01.04  50037    48741  150
 8019  2007.04.06  50034    49775  150
 8023  2007.04.10  49775    49775  120
 8024  2007.04.11  50035    48741  150
 8027  2007.04.14  50037    49778  100
 8471  2007.07.29  50041    46670  130
 9718  2007.10.03  50028    0      100
 8593  2007.10.06  42259    0      100
 8596  2007.10.24 116381    0      100
 8594  2007.11.01 143100    0      100
 9596  2007.11.04 113280    0      100
 9454  2008.09.11  56772    0      120
 9455  2008.09.13 100841    0      120
 9734  2008.09.16  50022    0      120
 9735  2008.09.19  50028    0      120
 9736  2008.09.20  50041    0      120
 9737  2008.09.21  50037    0      120
 9456  2008.09.24  59112    0      120
 9730  2008.09.25  54429    0      120
 9733  2008.09.27  59112    0      120
 9881  2008.09.28  54433    0      120
 9459  2008.09.30  70249    0      120
 9738  2008.10.02  58853    0      120
11744  2009.09.03  69996    0      130
-----------------------------------------
total		 1901508   394080  119 (135 for S3)
final**		 1550000   310000
-----------------------------------------
* R45 is PSPC flux in the R4-R5 band in RASS image units (see ./COOKBOOK). 
The average is weighted by the S3 exposures.
** Final adopted exposure after filling the source holes.

Processing exactly the same as acisi_D (including the VFAINT status bit),
see above.

The event readout PHA range (pha_ro) is 38-3270 ADU (upper end approx. 13
kev).

t_gain, CTI, gain files are ver. N0006 from CALDB (the latest);
the CTI correction for both FI and BI chips is applied.

bad pixel table: badpix_E_110210noedge (in this dir.)

File count rates (cts/s/chip) in various energy bands (2500-3000 is a PHA
band):
---------------------------------------------------------------------------
  E, keV       I0    I1     I2      I3      S2      S3      i0123
---------------------------------------------------------------------------
NO VFAINT CLEANING:
 0.3 12.0    0.5416  0.5573  0.5495  0.5645  0.5842  2.0521
 2.5  6.0    0.0966  0.0993  0.0990  0.1018  0.1065  0.1741
 2.5  7.0    0.1280  0.1318  0.1310  0.1350  0.1402  0.2321
 9.0 12.0    0.2057  0.2126  0.2018  0.2126  0.2225  1.2300
 9.5 12.0    0.1827  0.1888  0.1791  0.1883  0.1972  1.0974
10.0 12.0    0.1309  0.1354  0.1289  0.1356  0.1428  0.9067
2500 3000    0.1347  0.1351  0.1314  0.1364  0.1454  1.1531
 0.5  2.0    0.0752  0.0777  0.0812  0.0791  0.0867  0.1717
 2.0  5.0    0.0918  0.0941  0.0941  0.0965  0.1024  0.1690
 5.0 10.0    0.2265  0.2332  0.2265  0.2372  0.2365  0.7190
---------------------------------------------------------------------------
VFAINT-CLEAN:
 0.3 12.0    0.3684  0.3764  0.3704  0.3823  0.4018  1.6920  0.3744
 2.5  6.0    0.0836  0.0857  0.0855  0.0879  0.0932  0.1555  0.0857
 2.5  7.0    0.1063  0.1089  0.1085  0.1114  0.1179  0.2000  0.1088
 9.0 12.0    0.1220  0.1247  0.1194  0.1244  0.1325  1.0379  0.1226
 9.5 12.0    0.1097  0.1120  0.1072  0.1112  0.1182  0.9266  0.1100
10.0 12.0    0.0701  0.0717  0.0692  0.0717  0.0769  0.7621  0.0707
2500 3000    0.0777  0.0722  0.0787  0.0748  0.0846  0.9427  0.0759
 0.5  2.0    0.0500  0.0516  0.0516  0.0530  0.0591  0.1471  0.0515
 2.0  5.0    0.0815  0.0834  0.0828  0.0853  0.0906  0.1571  0.0832
 5.0 10.0    0.1598  0.1627  0.1595  0.1654  0.1675  0.5968  0.1618
---------------------------------------------------------------------------

############################################################################
nocti/aciss_E_*_bg_nocti_evt_110210:

Same as aciss_E_*_bg_evt_110210, but without the CTI correction for either
FI or BI chips. These may be helpful for observations in Graded mode.

gain, t_gain are ver. N0005 from CALDB.