To:sot_shift
from: Dan Schwartz
date: 01 May 00 , 12:00noon EDT
Subject: SOT shift report, Shift L283
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_01_2000_L283.txt
	
Shift L283. 
	Start at 122:12:00  GMT
		 = 08:00am    01 May EDT
	End	   12:00 noon 01 May
   
SOT Lead	DAS

(Times will be given in GMT on day 122. In general
times are rough, not precise.)

PLAN
Finish running load APR2300b. Perform CTI measurements on ACIS prior
to perigee passage. Start running load APR3000d, with CTI measurements
exiting from perigee. These latter measurements are planned to be used for
the Squeegy-III testing starting 4:45pm EDT today.  

Next Comms:
	122:20:45 to 23:30	ACIS Squeegy-III test
	123:06:00 to 07:00
        123:14:00 to 15:00
        123:22:00 to 23:00
        124:06:20 to 07:20
        124:14:20 to 16:20
        124:22:20 to 00:20

EVENTS
Status at LOS, 122:12:51 was as follows:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =    259.995 deg 
       DEC                    =    -60.000 deg
       ROLL                   =     51.899 deg
       Format                 =          2
       OBSID                  =      62069 (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 =  0.6360 mu-a
                       B-Leak =  0.1000 mu-a


12:55 LOS
	ACIS focal plane temperature = -118.4 deg C.

NOTES/ISSUES/PROBLEMS
Malang was off-line -- MIT/ACIS person needs to log in and bring up pmon.

Notes from 9am status meeting:
	8 supports over the weekend, 10 dumps, 1 unsuccessful. Loaded
3 segments of the APR3000d load, good through day 126:14:30. (However,
we expect to interrupt with a TOO at roughly 124:21.) 
	FOT has worked over the weekend to pre-plan the TOO, in case
it is approved. SI-Mode is still needed.
	AGASC 1.4 was approved by CCB -- will be installed AFTER load
reviews for MAY0700 are completed; i.e., to be used for MAY1400 load.
	It was just discovered that the OFLS does not correctly
schedule monitor star windows (this is when an observer wants to use
the ACA to do simultaneous photometry on the optical counterpart of
the X-ray target). Monitor stars are used extremely rarely, which is
why this hasn't been noticed before, but apparently it previously
happened to OBSIDs 614 and 1701, both of which failed to monitor the
target star as requested.

Telecon to discuss TOO for XTE J1550-564:
	ACIS IPI team does not believe there is significant risk, even
with credible double failures. The TOO is approved. Science Ops team must
build and test new parameter block for desired windowing. MIT/RXTE/ASM
team is monitoring the source, will notify sot_lead email list
routinely daily, and if it flares suddenly. 
	A suggestion was made to slightly move the target point, e.g.,
each week, just in case there was a question of damage. We urge that
such moves be carefully designed so as NOT to require new window
blocks. This is important since such blocks are difficult and error
prone. We suggest using both plus and minus Y-offsets, of 4 or 8
arcsec, to preserve the current column readouts.


-------------------------------------------------------
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 
-------------------------------------------------------