To:sot_shift from: Dan Schwartz date: 17 May 00 , 12:00noon EDT Subject: SOT shift report, Shift L299 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_17_2000_L299.txt. Shift L299. Start at 138:12:00 GMT = 08:00am 17 May EDT End 12:00 noon 17 May SOT Lead DAS (Times will be given in GMT on day 138. In general times are rough, not precise.) PLAN Continue running load MAY1600c (the rebuild with wider star magnitude selection windows). Exit from radiation zone, perform ACIS CTI measurement, perform OBSID 83, ACIS-S of the luminous supersoft X-ray source RX J0439.8-6809; and OBSID 962, ACIS-I observation of binary sources in Cen A. Following that will be the DDT/TOO coordinated observation of EX Hya, OBSID 1706, with ACIS-S/HETG. Next Comms: 138:13:55 to 14:55 138:23:00 to 00:00 139:07:00 to 08:00 139:15:20 to 16:20 139:23:00 to 00:00 140:08:30 to 09:30 141:05:00 to 06:00 141:13:55 to 14:55 141:22:00 to 23:00 142:07:00 to 08:00 142:14:30 to 15:30 143:00:30 to 01:30 EVENTS Status at LOS, 138:05:39, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 0 RA = 10.932 deg DEC = -58.251 deg ROLL = 139.487 deg Format = 2 OBSID = 62053 (ACIS CTI) SIM FA = -535 SIM TSC = -99616 (HRC-S) HETG = OUT (80.2 deg) LETG = OUT (78.7 deg) HRC-S HV is ON EPHIN: A-Leak = 0.1240 mu-a B-Leak = 0.0240 mu-a 12:27 Ascending through 18028 km. 13:55 AOS Status essentially unchanged from previous LOS. Ascending through 29852 km. 14:45 ACIS focal plane temperature is -117.6 14:55 LOS Status essentially unchanged EPHIN: A-Leak = 0.2560 mu-a B-Leak = 0.0400 mu-a ACIS focal plane temperature is -117.9 Ascending through 39430 km. NOTES/ISSUES/PROBLEMS From the 9am status meeting: Three passes yesterday, 3 good SSR dumps. One pass was extended, to upload the 3 replacement load segments for MAY1600c, which have the widened star magnitude limits. On board loads now good through 140:21:51 (~5:50 pm on May 19, EDT). It is still not absolutely clear, quantitatively, why so many stars were dropped with the narrower magnitude limits -- we are also asking how the on-board software automatic extension of star magnitudes should and does work. We also have a residual mystery on why the fid light was lost following a cosmic ray hit at 136:20:43 UTC, during OBSID 893 of ABELL 3128. To clarify, there is an OBC patch designed to prevent loss of fid light in such a situation (the patch does NOT re-acquire a lost fid light as was previously reported). Progress being made in MAY2100 load. Hope for products out tomorrow morning and initial review at 2pm, but still TBD. FOT has received final MAY2800 OR list, will start work. Quick Look Data: OBSID Target Time Comment ----- ------ ------------ ------- 00808 NGC 4736 2000:134:03 ACIS-S NONE Looks good 00497 A2199 2000:134:17 ACIS-S NONE Looks good 00661 1708-408 2000:136:04 ACIS-S NONE Looks good 00948 NGC 6752 2000:136:04 ACIS-S NONE Looks good 00081 1E 0035.4-7230 2000:136:15 ACIS-S NONE CC mode image, can't tell much from QL. 00893 ABELL 3128 2000:136:17 ACIS-I NONE No obvious problems: weak diffuse emission? ------------------------------------------------------- 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 -------------------------------------------------------