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Operations CXO Status Report

Friday 24 May 2013 9.00am EDT

During the last week Chandra the observing schedule was interrupted by a high-radiation event that activated the science instrument safing sequence (SCS 107) and stopped observing at 10:49am on May 22. All spacecraft actions were nominal. Real-time procedures were executed on May 22 to disable SCS-29, which was enabled during the safing sequence, and to update the observation identifier number, to aid CXCDS processing of the interrupted observation. A real-time procedure was executed on May 24 to verify that the radiation environment as observed by the HRC anticoincidence shield had decreased to an acceptable level. Loads for a replanned schedule were uplinked on May 24 with 121.9ks of science loss. Observations that were impacted will be rescheduled.

A Chandra press release was issued on May 23 as a NASA press release describing observations of SGR 0418+5729 (SGR 0418 for short), a magnetar that has been shown to have the lowest surface magnetic field ever found for this type of neutron star. For details see:

The schedule of targets for the next week is shown below and includes an observation of 4U 1630-47, which was accepted as a Target of Opportunity on May 20 and is coordinated with the EVLA.

        Radiation Belts                     May 26
        G11.2-0.3              ACIS-S
        4U1630-47              ACIS-S/HETG  May 27
        NGC2899                ACIS-S       May 28
        GROJ1008-57            ACIS-S
        HD124314               ACIS-I
        Radiation Belts                     May 29
        PSRB1509-58            ACIS-S
        NGC5373                ACIS-S       May 30
        SDSSJ1643+4414         ACIS-S
        M31Southwest           ACIS-S/HETG
        Radiation Belts                     Jun  1
        COSMOSLegacy           ACIS-I
        G241.77-24.00          ACIS-I
        COSMOSLegacy           ACIS-I
        M31BHXN                ACIS-I       Jun  2
        HAE281                 ACIS-S
        A1795                  ACIS-I


All spacecraft subsystems continued to support nominal operations.

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