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Operations CXO Status Report

Friday 5 April 2002 8.00am EST

During the last week the loads were interrupted on 2 April due to an execution of the Science Instrument safing SCS 107. The SCS was executed by the OBC as a result of the EPHIN hardware fault flag being set. Analysis of both real-time and dump data showed no problems with the hardware and a procedure was run on 3 April to re-initialize the OBC EPHIN process and resume science. A similar event occurred last December and a software patch to increase two glitch counters was identified to reduce further spurious trips of SCS 107. The patch is expected to be tested and brought for approval for uplink next week. Observations of NGC 6397, BR1202-0725 and HD133880 were impacted and will be rescheduled in an upcoming schedule.

Of note last week was a Chandra image release of the Coma cluster of galaxies. The image shows a concentration of relatively cool gas around two of the larger galaxies that is sustained in a delicate energy balance. For details see: http://chandra.harvard.edu/photo/2002/0150/index.html.

The observing schedule for the next week is shown below and includes an observation of GX 3+1 coordinated with RXTE.

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MSH 11-62 ACIS-S Apr 7 AX J1325.8-3920 ACIS-S Apr 8 HEN2-104 ACIS-S GX 349+2 ACIS-S/HETG GX 3+1 ACIS-S/HETG Apr 9 GK Per ACIS-S/HETG Radiation Belts RX J170930.2-263927 ACIS-S Apr 10 RCS1417+5305 ACIS-I NGC 4911 ACIS-I Apr 11 SU Uma ACIS-S/HETG Apr 12 Radiation Belts SU Uma ACIS-S/HETG Cyg X-1 ACIS-S/HETG Apr 13 4C 15.55 Field ACIS-I SDSS095151+594556 ACIS-S Apr 14 PSS0955+5940 ACIS-S FTM0738+2750 ACIS-S Crab Nebula Halo ACIS-I

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All spacecraft subsystems continued to operate nominally.

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