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Operations CXO Status Report

Friday 22 March 2013 9.00am EDT

During the last week the observing schedule was interrupted due to high radiation associated with solar activity. The loads were halted at 8:30am EDT on Mar 17 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 Mar 17 to start a collection of ACIS CCD charge-transfer inefficiency data. A replanned schedule for resuming science observations was uplinked on Mar 18 with 104.4ks of science loss. Scheduled observations of BD+39 3226, NGC 5252, SDSS J1643+4414, and PSR J0633+1746 were impacted and will be rescheduled.

Chandra passed through the eleventh, twelfth, and thirteenth eclipses of the season on Mar 16, 18, and 21 respectively, with nominal power and thermal performance. A real-time procedure was executed on Mar 22 to set the short eclipse flag to "true" in preparation for the final eclipse of the season.

A Chandra image release was issued on Mar 15 describing observations of G306.3-0.9, a newly discovered supernova remnant in the Milky Way that is among the youngest known. Discovered by Swift, scientists used Chandra to follow up the initial discovery, learning more about the remnant's properties. For details see:

A Chandra press release was issued on Mar 18 describing results from an observation of Kepler's supernova remnant. A long Chandra observation gives clues about the origin of the Kepler supernova remnant. Evidence points to the doomed white dwarf pulling material from a red giant star, not merging with another white dwarf. For details see:

The schedule of targets for the next week is shown below and includes an observation of SN2013ak, which was accepted as a Target of Opportunity on Mar 19, an observation of 2XMMI J184725.1-631724, which was accepted as a Director's Discretionary Time TOO on Mar 18, and observations of NGC 3783 coordinated with HST.

         NGC3783                ACIS-S/HETG  Mar 25
         QJ0158-4325            ACIS-S       Mar 26
         Radiation Belts
         PSRJ0633+1746          ACIS-I       Mar 27
         SN2013ak               ACIS-S
         NGC3783                ACIS-S/HETG
         TheMouse               ACIS-I       Mar 28
         2XMMIJ184725.1-6317    ACIS-S       Mar 29
         Radiation Belts
         NGC7076                ACIS-S
         PSRJ0358+5413          ACIS-I       Mar 30
         COSMOSLegacy           ACIS-I
         HE0435-1223            ACIS-S       Mar 31
         SDSSJ0844+1245         ACIS-S


All spacecraft subsystems continued to support nominal operations.

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