To:sot_shift
from: Dan Schwartz
date: 4 Sep 99, 06:00am EDT
Subject: SOT shift report, Shift H44
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Sep_04_1999_H44.txt.

Shift H44.
	Start at 247:02:00  GMT
		 = 10:00pm 04 Sep EDT
	End	   06:00am 05 Sep
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		SSM,GA
ACIS 		

(Times will be given in GMT on day 247. In general
times are rough, not precise.)

PLAN
Running P10.  In radiation belt until 05:23. After belts, maneuver
   to G21.5-0.9 for HRC-I standard candle observation. That will
   extend to the end of P10 load at 247:14:30.
Need to review and approve P11 load.
Run CAP 371 to exercise grating (HETG) via software commands.

EVENTS
Start Shift LOS. Pointing position is at Cas A, but we are in
	radiation belts so the instruments are turned off. 
03:02	AOS.  
03:03	Start SSR playback
03:19   Momentum unloading. 
03:27   Momentum unloading finished.
03:28   Run CAP 371 for software retraction of HETG grating
	Software retraction is successful. We observe 6v on the
	B side power supply while, and only while, grating motor
	is actually being driven, as reported in shift M44.
04:00   LOS
08:46  AOS  Out of radiation belts. Running OBSID 143, with 5 stars and 
	3 fid lights.
	HRC RATES ARE HIGH -- Shield rates ~5800 per sec, and Valid
	rates variable from 250 to > 500 per sec. 
09:35   Start SSR playback.

NOTES/ISSUES/PROBLEMS
Very tight schedule for review of P11 load. Telecon at 247:04:00
verifies all operations are safe, and allows the unlink and
execution of the load.  A small SIM offset during HRC-S 
observation 1153 was not scheduled, reason unknown. Details
of ACIS-I observations need further review, but they will not
be executed until the second half of the load, and corrections
can be made if necessary.

In the case of ACIS, we are concerned 
with the seeming difficulty of scheduling ACIS to be in an
event histogram mode using format 1 during HRC observations. This
needs to be mechanized, as IT MUST BE THE ROUTINE during the 
normal mission.

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