To:sot_shift from: Dan Schwartz date: 04 Jan 00 , 12:00noon EST Subject: SOT shift report, Shift L165 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jan_04_2000_L165.txt. Shift L165. Start at 004:13:00 GMT = 08:00am 04 Jan EST End 12:00 noon 04 Jan SOT Lead DAS Spac/Aspect FOT/Sci liason HRC ACIS (Times will be given in GMT on day 004. In general times are rough, not precise.) PLAN Continue running load DEC2999d. Finish OBSID 747, ACIS-S observation of the soft gamma ray burst repeater SGR 0526-66, and do OBSID 775, ACIS-S of the LMC supernova remnant DEM 71, and OBSID 835, ACIS-S of the ultraluminous IRAS double-nucleus galaxy NGC 3256. Next Comms: 004:14:15 to 16:00 004:23:15 to 01:35 005:06:30 to 08:30 005:14:00 to 16:00 005:22:00 to 00:00 EVENTS Status at LOS, 004:05:29, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 81.455 deg DEC = -66.087 deg ROLL = 339.233 deg Format = 2 OBSID = 747 (SGR 0526-66) SIM FA = -467 SIM TSC = 75623 (ACIS-S) HETG = OUT (81.0 deg) LETG = OUT (79.1 deg) HRC-S HV is ON EPHIN: A-Leak = 0.2080 mu-a B-Leak = 0.0320 mu-a 13:51 Chandra ascending at 136374 km. 14:15 AOS Status at 004:14:21, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 76.392 deg DEC = -67.890 deg ROLL = 334.090 deg Format = 2 OBSID = 775 (DEM 71) SIM FA = -467 SIM TSC = 75623 (ACIS-S) HETG = OUT (81.0 deg) LETG = OUT (79.1 deg) HRC-S HV is ON EPHIN: A-Leak = 0.2760 mu-a B-Leak = 0.0440 mu-a 16:00 LOS. Status essentially unchanged from above. NOTES/ISSUES/PROBLEMS From 9am status meeting: 3 passes, 3 good dumps, next command segment uploaded. We had difficulty with a ground acquisition yesterday because the OFLS system incorrectly commanded use of LGA-B, whereas it was antenna A and not B which was visible at the time. FOT/MPS is investigating. CAP 537 was run to reinitialize EPS software -- this provides slightly different limits for the perihelion season. CAP 425C will be run today to do an EIA sequencer self-test -- this is done ~monthly throughout the mission. As noted in report M164 yesterday, OBSID 747 had a star that was too bright, causing Acq/Search cycling. Eric M has prepared the new Command Sequence Definition to set all bright thresholds to be 5.8, and will bring to the Flight Director's CCB on Thursday. This CSD will also change the fid light readouts to be 8x8 instead of the current 6x6. Since mission planning is working one to two weeks in advance, the new CSD won't be in effect until one to two weeks after CCB approval. FOT/MPS is having problems with OBSID 767, a time constrained observation of SN 1998s, due to lack of stars. Can SOT/MPS help by selecting fainter stars (we have ~ a factor of 2 margin in the ACA) and/or increasing the ACA integration time to 3.7 seconds for this OBSID in order to be sensitive to fainter stars? This will have a major impact on preparing the JAN0900 load if we must delete this observation. Quick look data review: OBSID Target Time Comment ----- ------ -------------- ------- 00634 LMC ACIS-I. Lots of sources 00799 NGC1395 ACIS-I. Several sources over field 00378 M82 ACIS-I. Great Image! 00815 Q0254-334 ACIS-S No obvious detection 00839 3C220.1 ACIS-S. Detection. 00750 RXJ0822-4300 ACIS-S Detection. ------------------------------------------------------- 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 -------------------------------------------------------