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Operations CXO Status Report

Friday 13 January 2012 9.00am EST

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

A real-time procedure was executed on Jan 9 to gradually raise the HRC-S MCP HV levels during an observation. This procedure was used collect data for use in a determination of updated HV levels that will recover some quantum efficiency loss caused by a drop in detector gain. The HV levels were restored to their nominal values at the conclusion of the observation.

A Chandra press release was issued on Jan 10 describing the discovery, using Chandra and the NSF-funded Atacama Cosmology Telescope (ACT), of a galaxy cluster, ACT-CL J0102-4915. Nicknamed "El Gordo", it is the most massive, the hottest, and gives off more X-rays than any known cluster at its distance or beyond. El Gordo is actually the site of two galaxy clusters colliding, making it a younger cousin to the well-known Bullet Cluster. For details see: http://chandra.si.edu/press/12_releases/press_011012.html

The schedule of targets for the next week is shown below and includes observations of SN 2011ay and 4U 1630-47, which were accepted as Targets of Opportunity on Dec 29 and Jan 4 respectively.

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Radiation Belts Jan 15 SN2011ay ACIS-S M37 ACIS-I M31BHXN ACIS-I Jan 16 E0102-72S2 ACIS-S Jan 17 4U1630-47 ACIS-S/HETG HD143761 ACIS-S 1542+390 ACIS-S UGC6446 ACIS-S Radiation Belts Jan 18 NGC3794 ACIS-S PSRJ1038+0032 ACIS-S NGC3115 ACIS-S Radiation Belts Jan 20 4U1630-47 ACIS-S/HETG NGC3115 ACIS-S Jan 21

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All spacecraft subsystems continued to support nominal operations.

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