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Operations CXO Status Report

Friday 11 July 2014 

During the last week the observing plan was halted on Jul 6 due to the vehicle load of a vehicle/observing pair being active but not executing its commands. The science instrument safing sequence (SCS 107) was manually activated at 7:36pm and ran nominally. The active vehicle stored command sequences were disabled and the contents of the sequence that was not executing were dumped for analysis. The root cause of the problem has been traced to operator error during the uplink of the load segments on Jul 3. Loads for a replanned schedule were uplinked on Jun 7 with 74.7ks of science loss. Planned observations of NGC1399, Mkn 766, and the Ophiuchus Cluster were impacted by the interruption and will be rescheduled.

A real-time procedure was executed on Jun 7 to disable SCS-29, which was enabled during the safing sequence.

Preparations are complete for the start of the 2014 summer eclipse season; the season contains 16 eclipses and runs from Jul 13 to Aug 21.

Of note this week was the "X-ray View of Galaxy Ecosystems" science workshop being held in Boston, Jul 9-11.

Also of note this week were the release on Jul 9 of CXCDS 10.2.4 for standard processing and of CALDB 4.6.2. CXCDS 10.2.4 includes an update to the Telemetry Database along with various bug fixes and enhancements. CALDB 4.6.2 includes ACIS time-dependent gain corrections for the period Feb-Apr 2014, updated aspect alignment files, and an updated ACIS time-dependent contamination correction. For details see: http://cxc.cfa.harvard.edu/caldb/downloads/Release_notes/CALDB_v4.6.2.html

The schedule of targets for the next week is shown below and includes an observation of SGR 1935+2154, which was accepted as a Target of Opportunity on Jul 7, an observation of Swift J174805.3-244637, which is part of a Target of Opportunity series accepted on 2012 Sep 4, and an observation of SXP 1062, which is part of a Target of Opportunity series accepted on Jun 3 and coordinated with Swift.



HE1104-1805 ACIS-S Jul 14 Mkn766 ACIS-S/HETG SwiftJ1822.3-1606 ACIS-S Jul 15 SwiftJ174805.3-2446 ACIS-S SGR1935+2154 ACIS-S Radiation Belts PKSB2152-699-HIC ACIS-S Jul 16 SgrA* ACIS-S Terzan5 ACIS-S Jul 17 Radiation Belts Jul 18 SXP1062 ACIS-I PKSB2152-699-HIC ACIS-S Jul 19 Terzan5 ACIS-S Jul 20

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All spacecraft subsystems continued to support nominal operations.

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Of note this week was the "X-ray View of Galaxy Ecosystems" science workshop being held in Boston, Jul 9-11.

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