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Operations CXO Status Report

Friday 2 March 2012 9.00am EST

During the last week the observing schedule was interrupted due to high radiation associated with solar activity. The loads were halted at 10:24pm EST on Feb 26 through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. All spacecraft actions were nominal. A real-time procedure was executed on Feb 27 to disable SCS-29, which was enabled during the safing sequence. An additional real-time procedure was executed on Feb 27 to start a collection of ACIS CCD charge-transfer inefficiency data. A replanned schedule for resuming science observations was uplinked on Feb 27 with 87.8ks of science loss. Planned observations of 4C73.18, G115.71+17.52, J1214.0+2932, HD 188015, G38.7-1.4, and J0232.3-3639 were impacted and will be rescheduled.

A real-time procedure was executed on Mar 2 to update the on-board ephemeris.

The schedule of targets for the next week is shown below and includes an observation of 55 Cnc, which was accepted as a Director's Discretionary Time TOO on Feb 23 and is coordinated with HST, an observation of IGR J18179-1621, which was accepted as a Target of Opportunity on Mar 1, and an observation of RXJ1622.7-2325_P1 coordinated with OVRO/CARMA.

40EriC                 ACIS-S       Mar  4
         SDSSJ0901+3549         ACIS-S
         3C270.1                ACIS-S
         Radiation Belts                     Mar  5
         G288.61-37.65          ACIS-I       Mar  6
         NGC3393                ACIS-S/HETG
         55Cnc                  ACIS-S       Mar  7
         NGC3393                ACIS-S/HETG
         SDSSJ1143+3452         ACIS-S       Mar  8
         HS2237+8154            ACIS-S
         Radiation Belts
         NGC3393                ACIS-S/HETG
         SDSSJ1027+3543         ACIS-S       Mar  9
         M31                    HRC-I
         ESO399-20              ACIS-S
         PSRJ1355-6206          ACIS-S
         RXJ1622.7-2325_P1      ACIS-S
         SPT-CLJ0014-4952       ACIS-I
         1RXSJ170047.8-31444    ACIS-S       Mar 10
         NGC5080                ACIS-S
         NSV11919               ACIS-S
         J084802.2+740546       ACIS-S
         Mrk423                 ACIS-S
         SDSSJ1503+3641         ACIS-S
         Radiation Belts                     Mar 11
         IGRJ18179-1621         ACIS-S/HETG
         SDSSJ1057+4403         ACIS-S
         4U2129+47              ACIS-S


All spacecraft subsystems continued to support nominal operations.

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