To:sot_shift
from: Dan Schwartz
date: 07 Apr 00 , 12:00noon EDT
Subject: SOT shift report, Shift L259
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_07_2000_L259.txt.

Shift L259. 
	Start at 098:12:00  GMT
		 = 08:00am    07 Apr EDT
	End	   12:00 noon 07 Apr
   
SOT Lead	DAS

(Times will be given in GMT on day 098. In general
times are rough, not precise.)

PLAN
Continue running load APR0400b. Finish last NGC 4406 ACIS-S
observation, OBSID 318. Perform CTI measurements prior to entering
radiation belts. First ACIS squeegy test will take place after belt
egress. 
Next Contacts:
 098:13:00 to 14:00
 098:23:30 to 03:30 -- ACIS squeegy mode test.
 099:07:00 to 08:00
 099:16:00 to 17:00
 099:23:05 to 00:05
 100:06:05 to 08:05
 100:14:30 to 17:30
 101:02:40 to 04:00
 101:11:40 to 13:40



EVENTS

Status at LOS, 098:05:34 was as follows:
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =    186.529 deg 
       DEC                    =     12.994 deg
       ROLL                   =    206.523 deg
       Format                 =          2
       OBSID                  =        963 (NGC 4406)

       SIM FA                 =       -467
       SIM TSC                =      75623 (ACIS-S)
       HETG                   =        OUT (80.2 deg)
       LETG                   =        OUT (79.1 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.1960 mu-a
                       B-Leak =  0.0320 mu-a

13:00 AOS
Status at AOS:
       PCAD MODE              =       NMAN
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          0 
       FIDS                   =          0
       RA                     =     51.183 deg 
       DEC                    =     53.453 deg
       ROLL                   =    315.892 deg
       Format                 =          2
       OBSID                  =      62091 (ACIS CTI)

       SIM FA                 =       -467
       SIM TSC                =     -99616 (HRC-S)
       HETG                   =        OUT (80.2 deg)
       LETG                   =        OUT (79.1 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.1280 mu-a
                       B-Leak =  0.0240 mu-a
14:07 LOS
Did two playbacks, last one certainly good, first was questionable.

Status at LOS:
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =    345.000 deg 
       DEC                    =     54.997 deg
       ROLL                   =     39.921 deg
       Format                 =          2
       OBSID                  =      62091 (ACIS CTI)

       SIM FA                 =       -467
       SIM TSC                =     -99616 (HRC-S)
       HETG                   =        OUT (80.2 deg)
       LETG                   =        OUT (79.1 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.1280 mu-a
                       B-Leak =  0.0240 mu-a

Descending through  68869 km.

ACIS focal plane temperature at end of pass was -119.7 deg C.

NOTES/ISSUES/PROBLEMS
Why are there no fid lights for OBSID 963 observation of NGC 4406?
	Preliminary investigation by FOT/MP shows that the fid
positions were commanded 1 arcmin offset in Z from where they should
have been. This was a field with a manually replaced star catalog. The
immediately following observation was of the same target, but with a
SIM-Z offset.


Notes from 9am status meeting:
	97,000 minor frames are missing -- being worked offline to see
if they are lost, recoverable, or perhaps just delayed in
delivery. On-board loads good for remainder of week, until 101:05:54.
	ASVT testing certified 11 of the scripts in the new safe mode
clean up procedure. Need some more time next week to do 1 more SI
cleanup and the fine attitude initialization. 
	The 8.1a test load continues to refuse to schedule HRC
observations. This is probably okay, because the original load for
that week (MAR1200) also did not have HRC observation. Will try week
of 12 Dec 99, this will postpone the team review of load products
until later next week.
	CAP 591 signed off, ready to run squeegy mode test this
evening!

Quick look data: (no new data to CXC from GOT for past 36 hours)
OBSID 439, ACIS-I calibration observation of E0102-72.3 on I3 looks good.

Strange appearance of OBSID 664, reported on 5 Ap in shift L257, has
been explained as the way the data system currently handles CC mode
images, since one dimension has effectively been collapsed, and the
width shown is only the dither pattern.

SOLAR ACTIVITY:
	ACE 130-214 keV proton rates are down a factor of 50 from
their peak at ~1630 yesterday. The total fluence from the previous
orbit, above 70Kkm was 4.56 10^9 protons per (keV ster cm^2), compared
to a sum total of 5.33 10^9 for the time from Jan 29 through the
previous orbit. The former number would only be equivalent to roughly
10^9, if we consider that the HETG was in place for most of the time.
	At the ACIS telecon yesterday we agreed to redefine
the allowed maximum single orbit fluence at 10^10, and we have since
set our automatic notification trigger at 8 10^9.
	In the next orbit, starting 099:04:46, ACIS will only have
about 30 Ksec in the focal plane without gratings, plus 74 Ksec with gratings.

-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
-------------------------------------------------------