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Operations CXO Status Report

Friday 24 October 2008 7.30am EDT

Chandra entered Normal Sun Mode (NSM) at 4:24 pm on Saturday Oct 18 as the result of a reset of the Interface Unit (IU) on-board the spacecraft. Entry into NSM was nominal and assessment of the telemetry indicated that all spacecraft hardware was performing nominally. Engineering assessment suggested that the reset of the IU and subsequent transition to NSM was due to a single event upset and the decision was made to recover to normal pointing mode and continue with science. The recovery took place on Oct 19-20 and science was resumed on Oct 21 at 7:54 am. A full fault tree analysis of the anomaly will be conducted. Science targets that were impacted by the anomaly will be rescheduled in a future load.

In addition to the real-time procedures associated with the NSM recovery, the on-board Ephemeris was updated on Oct 20.

The schedule of targets for the next week is shown below and includes an observation of BRI0021-0214 coordinated with the VLA.

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Radiation Belts Oct 25 1E1547.0-5408 ACIS-S Oct 26 SN1996cr ACIS-S XTEJ1734-234 HRC-I Oct 27 0119+115 ACIS-S NGC23 ACIS-S J1835-1106 ACIS-I IGRJ18462-0223 ACIS-I J1730-3350 ACIS-I NGC6522 ACIS-S NGC6569 ACIS-S Radiation Belts Oct 28 PDCS-016 ACIS-I cl0340-2840 ACIS-I BRI0021-0214 ACIS-I Oct 29 NGC57 ACIS-S AXJ1732.2-3044 ACIS-I WR18 ACIS-S NGC6642 ACIS-S NGC6553 ACIS-S Oct 30 IGRJ17586-2129 ACIS-I ISCS1036+1088 ACIS-I LEDA37241 ACIS-I IGRJ12275+3759 ACIS-I Radiation Belts NGC6539 ACIS-S Oct 31 F01166-0844 ACIS-S PSRJ1843-1113 HRC-S IGRJ12422+3526 ACIS-I Nov 1 S99 ACIS-S NGC6540 ACIS-S BHR71-MM ACIS-I PDCS-016 ACIS-I F00091-0738 ACIS-S NGC6637 ACIS-S IGRJ17487-3124 ACIS-I Nov 2 IGRJ17448-3232 ACIS-I PG1115+080 ACIS-S

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All spacecraft subsystems continued to support nominal operations.

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