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Operations CXO Status Report

Friday 12 December 2008 7.00am EDT

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

Real-time procedures were conducted on Dec 9 to reconfigure the radiation detector, EPHIN, and to load a related flight software patch to the RadMon process. The EPHIN reconfiguration will counter the effect of increasing detector deadtime from operating at elevated temperatures. The RadMon patch modifies which EPHIN coincidence channels are monitored and sets new thresholds that define a high-radiation environment. The patch includes using the HRC multi-channel plate rate as a channel for the identification of a high-radiation environment. These changes will provide Chandra with more robust radiation protection given the on-going thermal conditions.

A real-time procedure was also conducted on Dec 9 to dump OBC-A memory as a follow-up to the RadMon patch. The dump will be used to update the baseline memory image maintained on the ground.

The schedule of targets for the next week is shown below and includes an observation of M31 coordinated with XMM-Newton.

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Radiation Belts Dec 14 GRB081007 ACIS-S Dec 15 SN1996cr ACIS-S/HETG Alpha Centauri HRC-I Dec 16 HD119682 ACIS-S/HETG Dec 17 Radiation Belts M31 HRC-I Dec 18 RXCJ0352.9+1941 ACIS-S M31 HRC-I 3C98 ACIS-I GRB081007 ACIS-S HD119682 ACIS-S/HETG Dec 19 SN1996cr ACIS-S/HETG Radiation Belts Dec 20 HD119682 ACIS-S/HETG Abell 0598 ACIS-I Dec 21 HD119682 ACIS-S/HETG SDSSJ080859.33+2047 ACIS-S Dec 22 SDSSJ0810+34585 ACIS-S SN1996cr ACIS-S/HETG

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All spacecraft subsystems continued to support nominal operations.

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