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Operations CXO Status Report

Friday 16 December 2016 9.00am EST

During a real-time pass on Dec 9 the ACIS Digital Processing Assembly Side-A (DPA-A) was detected in an unexpected powered-off state. Engineering assessment indicated behavior consistent with prior cases where the DPA powered-down. In each of those cases a fault-tree analysis concluded the event was due to a single event upset. The DPA was powered back on and the required software patches reloaded during a real-time pass on Dec 9. Recovery was complete at 7:13pm EST on Dec 9 with 29.1ks of science loss. The scheduled observation of Abell 1795 Outskirts was impacted by the DPA-A shut-down and the lost science time will be rescheduled in future weeks.

Of note this week was the release on Dec 15 of the Cycle 19 Call for Proposals. The proposal submission deadline is 15 March 2017. In conjunction with the call was the release of the CIAO 4.9 analysis software system, CALDB 4.7.3, MARX 5.3.2, DS9 7.5 and of CXCDS 10.5.3 for standard processing. For details see: and

The schedule of targets for the next week is shown below and includes an observation of HS 0810+2554 coordinated with NuSTAR.

        RXJ1131-1231           ACIS-S       Dec 19
        CygnusA-WHotspot       ACIS-I
        3C129.1                ACIS-S
        Radiation Belts                     Dec 20
        Abell1795outskirts     ACIS-I
        IGRJ00370+6122         HRC-I        Dec 21
        3C129.1                ACIS-S
        2MASSJ06170531+8353    ACIS-S
        IRAS17020+4544         HRC-S /LETG
        Q2237+0305             ACIS-S       Dec 22
        Radiation Belts                     Dec 23
        HS0810+2554            ACIS-S
        NGC4419                ACIS-S       Dec 24
        IRAS17020+4544         HRC-S /LETG
        Abell1795outskirts     ACIS-I
        Radiation Belts                     Dec 25


All spacecraft subsystems continued to support nominal operations.

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