To:sot_shift
from: Dan Schwartz
date: 09 Sep 99, 02:00pm EDT
Subject: SOT shift report, Shift L49
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Sep_09_1999_L49.txt.

Shift L49
	Start at 252:10:00  GMT
		 = 06:00am 09 Sep EDT
	End	   02:00pm 09 Sep
   
SOT Lead	DAS
Spac/Aspect	RAC
FOT/Sci liason	
HRC		
ACIS 		

(Times will be given in GMT on day 252. In general
times are rough, not precise.)

PLAN
Load the revised P12 and recover from bright star hold.
Exit radiation belts and resume P12d observations at 252:12:40
  HRC-S/LETG focus plate measurements on Capella until 253:07:15
	OBSIDs 1167, 1244, 1169, 1246
  Then intermediate position with OBSID 62388 until 07:33
  Then HRC-I science target CEN A, until 253:19:50
	OBSIDs 464 and 1253.

EVENTS
Start of shift LOS
10:26  AOS. Downlink established. OBSID is 62415.  In Format 2
	at intermediate position RA=63.75, dec =-15.5 deg.
	SIM at ACIS-I aim point and focus. Gratings out.
11:18 End SSR playback. CFC count=24 (<5 errors). reset pointers
12:10 End comm, turn transmitter off.

17:48 AOS, establish comm. We are successfully executing load P12d!
	Currently OBSID 1244, the second observation of P12d, is
	running, we have 5 stars and 3 fid lights, HRC-S is
	in proper configuration and taking data.
17:56	Start CAP 396, to collect raw frame data from ACIS
18:00  Difficulties with ground links from DSN delay start of CAP



NOTES/ISSUES/PROBLEMS
24-hr science ops summary for 9am meeting:  
   ACIS-I Observing: OBSID 1111,  PKS 0312-77   Pileup. Completed
     with anomalous lock on fid instead of star.
   251:14:25 to 252:12:10 in bright star hold mode. P12 load halted.
   Radiation belt passage 252:02:07 to 252:13:02
   Replan P12d to pickup at belt exit.
   HRC-S in standby with reduced HV.
   All instrument performance nominal.


ANOMALY:  ACIS event histograms observing the external radioactive
	source show terrible energy resolution, ~4 times expected
	FWHM.  We got agreement to extend the ground contact from 
	17:45 to 00:30. We will take two separate 1-hr segments of 
	Format 2 data, out of each of the OBSIDs 1244 and 1169. 
	We define 4 new OBSIDs:
	62413  For format 2, ACIS raw frame data
	62412  return to format 1, finish what was OBSID 1244
		while ACIS takes event histogram data.
	62411  1 hr of ACIS format 2 data, configuration TBD
	62410  return to format 1, finish what was OBSID 1169
		while ACIS takes event histogram data.
	


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