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Operations CXO Status Report

Friday 4 June 2004 8.30am EDT

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

A real-time procedure was completed on June 1 to patch the angular momentum auto-unload threshold and dead-zone constants in CPE-A. The auto-unload threshold was raised to agree with the value in the OBC, while the dead-zone was raised to keep the duration of the unloads unchanged. This patch reduces the possibility of an unnecessary momentum unload shortly after safe-mode entry when the thermal environment of the MUPS thrusters is unconstrained.

A real-time procedure was completed on June 3 to patch the ACIS flight software. The uplink and comparison with ground image were completed nominally. The patch corrects an occasional error in raw-mode runs in which rows of CCD pixels were dropped from output telemetry and provides a modification that will allow for the future addition of timed-exposure modes without increasing code or testing complexity.

Two Chandra press releases were issued on Jun 1 and 2 in conjunction with the AAS meeting. The first made jointly with the Spitzer Science Institute and the Space Telescope discussed the Great Observatories Origins Deep Survey (GOODS), and the second describing evidence that a gamma-ray burst occurred in our Galaxy a few thousand years ago. For details see:
http://chandra.harvard.edu/photo/2004/goodsbh/
http://chandra.harvard.edu/photo/2004/w49b/

The schedule of targets for the next week is shown below.

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Radiation Belts Jun 6 SN2004C ACIS-S NGC3077/M81 Field HRC-I Jun 7 Daddi field - 1 ACIS-I FTM 1004+1229 ACIS-S J1715+2145 ACIS-S RXCJ2011.3-5725 ACIS-I RXCJ0232.2-4420 ACIS-I Jun 8 Radiation Belts Arches Cluster ACIS-I Jun 9 eps Pav ACIS-I Jun 10 DLS J0518-4849 ACIS-I Daddi field - 2 ACIS-I Radiation Belts Jun 11 Mrk 463 ACIS-S Sculptor Dwarf Sph ACIS-S Jun 12 Daddi field - 3 ACIS-I PC 1450+3404 ACIS-S NGC 40 ACIS-S Jun 13

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All spacecraft subsystems continued to support nominal operations.

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