To:sot_shift from: Dan Schwartz date: 19 Oct 99 , 11:00am EDT Subject: SOT shift report, Shift L88 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_19_1999_L88.txt. Shift L88. Start at 292:11:00 GMT = 07:00am 19 Oct EDT End 11:00am 19 Oct SOT Lead DAS Spac/Aspect FOT/Sci liason HRC ACIS (Times will be given in GMT on day 292. In general times are rough, not precise.) PLAN Continue running load P22c, revised to expire at 293:05:00. Intervene to send new parameter blocks for ACIS that do not use FEP 0, in the following runs: OBSID Target Obs. Start Comm. Start 549 RX J1720.1+2638 292:10:16 292:10:00 553 ABELL 2218 292:13:32 292:15:10 107 CYG X-1 292:19:35 292:21:20 101 CYG X-3 293:00:05 293:00:05 Send up the P22e load with new ACIS parameter blocks that do not use FEP 0. EVENTS From Plucinsky's ACIS report: " The "ACIS Realtime Intervention Team" was at work again this morning. We interrupted OBSID 549 with CAP 486. The CAP stopped the science run which utlized FEP0-5 and CCDs I0-I3, S2 & S3 in very faint 5x5 mode and started a new science run with OBSID 1453 which utilized FEPS1-5 and CCDs I0-I3 & S2 in faint 3x3 mode. GMT Event 292:10:00 AOS on DSS 54 [Madrid] 292:10:01 FMT 2, science run 549 in progress, gratings retracted, SIM at 92903 (ACIS-I) 292:10:10 start CAP 486, uplink the loads 292:10:22 biases complete, 1st data packet 292:10:25 stopScience 292:10:26 change OBSID to 1453 292:10:29 reconfigure for next run 292:10:30 startScience 292:10:35 confirm FEPS 1-5 in use, CCDs I0-I3 & S2 292:10:42:30 1st bias packets 282:10:51:50 biases telemetered, 1st data packets 292:11:45 LOS" Status at LOS was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 358.764 deg DEC = 28.660 deg ROLL = 233.509 deg Format = 2 OBSID = 1453 SIM FA = -535 SIM TSC = 92903 (ACIS-I) HETG = OUT LETG = OUT HRC HV is OFF EPHIN: A-Leak = 0.1600 mu-a Status at AOS, 292:15:25, observing ABELL 2218 PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 248.922 deg DEC = 66.165 deg ROLL = 315.316 deg Format = 2 OBSID = 553 SIM FA = -535 SIM TSC = 92903 (ACIS-I) HETG = OUT LETG = OUT HRC HV is OFF EPHIN: A-Leak = 0.1680 mu-a At 15:32 we interrupted OBSID 553 with CAP 486. The CAP stopped the science run which utilized FEP0-5 and CCDs I0-I3, S2 & S3 in faint 3x3 mode and started a new science run with OBSID 1454 which utilized FEPS1-5 and CCDs I0-I3 & S2 in faint 3x3 mode. The old run, 553, looked fine -- no FEP0/S3 problems. GMT Event 292:15:10 AOS on DSS 66 [Canberra] 292:15:11 FMT 2, science run 553 in progress, gratings retracted, SIM at 92903 (ACIS-I) 292:15:15 OC starts SSR playback 292:15:20 start CAP 486, uplink the loads 292:15:28 stopScience 292:15:30 change OBSID to 1454 292:15:31 reconfigure for next run 292:15:32 startScience 292:15:36 confirm FEPS 1-5 in use, CCDs I0-I3 & S2 292:15:44:00 1st bias packets 282:15:53:30 biases telemetered, 1st data packets 292:16:02 LOS Status at LOS, observing ABELL 2218, as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 248.922 deg DEC = 66.165 deg ROLL = 315.316 deg Format = 2 OBSID = 1454 SIM FA = -535 SIM TSC = 92903 (ACIS-I) HETG = OUT LETG = OUT HRC HV is OFF EPHIN: A-Leak = 0.1680 mu-a NOTES/ISSUES/PROBLEMS "1. OBSID 549 did not exhibit any anomalous behavior with FEP0 which could be discerned from the counts rates. The total count rate fluctuated from 48-58 c/s. We acquired 52 exposures before the stopScience was executed, the S3/FEP0 count rate was 1684 cts/ 166.4 s == 10.1 cts/s. All other chips looked nominal. I3 exhibited a count rate of 11.2 cts/s, presumably this is where the source is. I1 has the lowest rate of 7.2 cts/s. OBSCAT prediction for the source rate is 2.3 cts/s 2. OBSID 1453 count rate is 44-51 cts/s. At LOS, we had acquired 990 frames and the average rate was 46.6 cts/s. 3. OBSID 553 did not exhibit any anomalous behavior with FEP0 which could be discerned from the counts rates. The total count rate fluctuated from 49-67 c/s. We intercepted about 5ks into the observation. The S3/FEP0 count rates and threshold crossings were nominal. We acquired 1842 frames (5,894.4 s) and there was no evidence of the problem. 4. OBSID 1454 had count rates which fluctuated between 37.4 and 45.7 cts/s. ACIS: Paul Plucinsky" ------------------------------------------------------- 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 -------------------------------------------------------