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Operations CXO Status Report

Friday 5 September 2003 10.30am EDT

During the last week Chandra completed the observing schedule as planned.

Real-time procedures were completed on Sep 2 to uplink and test a software patch to modify the threshold criteria for triggering science instrument safing under high radiation conditions. The change increases the number of sequential frames from EPHIN required to trigger a high radiation condition from 4 to 10 and will significantly reduce the number of unwanted triggers just prior to radiation belt entry. The uplink and test proceeded nominally.

A Chandra image release was issued on September 3 showing the aftermath of a glancing collision between two galaxies in the Virgo cluster.

For details see: http://chandra.harvard.edu/photo/2003/ngc4438/.

The observing schedule for next week is shown below:

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Radiation Belts Sep 7 G11.2-0.3 ACIS-S Sep 8 H 1426+428 ACIS-S/HETG PSS 1646+5514 ACIS-S Sep 9 2MASS153628+614642 ACIS-S 7C 1745+6227 ACIS-S BO 375 HRC-I BR 0353-3820 ACIS-S Sep 10 SDSSJ015652.43-001222.0 ACIS-S Radiation Belts SDSS J222509-001406 ACIS-S ABELL 2390 ACIS-S NGC 1705 ACIS-S Sep 12 Radiation Belts V834 CENTAURI ACIS-S/HETG Sep 13 AX J1845-0258 ACIS-S Sep 14 NGC 5204 X-1 ACIS-S CENTAURUS A ACIS-S

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All spacecraft subsystems continued to operate nominally.

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