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Operations CXO Status Report

Friday 1 May 2015 9.00am EDT

During the last week the observing schedule was replanned to incorporate an observation of GRB150423A, which was accepted as a Director's Discretionary Time Target of Opportunity on Apr 28. Scheduled observations of NGC4487 and MCG+01-32-049 were impacted by the replan and will be rescheduled in future weeks.

A Chandra press release was issued on Apr 30 describing results from a study that suggests a group of unusual giant black holes may be consuming excessive amounts of matter. Thick, donut-shaped disks may be surrounding the black holes, blocking much of the light that would otherwise be emitted. The black holes in these quasars may be growing at an extraordinarily rapid rate. For details see: http://chandra.si.edu/press/15_releases/press_043015.html

Also of note this week was the announcement on Apr 30 of the release of version 5.1 of MARX, a suite of programs designed to enable the user to simulate the on-orbit performance of the Chandra X-ray Observatory. For details see: http://space.mit.edu/ASC/marx/index.html Also announced was the availability, as of Apr 21, of Sherpa as an Open Source project with its source code repository available on GitHub (https://github.com/sherpa/sherpa). Sherpa is the CIAO modeling and fitting application. It enables the user to construct complex models from simple definitions and fit those models to data, using a variety of statistics and optimization methods.

The schedule of targets for the next two weeks is shown below and includes an observation of GRB 150314A, which is a Target of Opportunity follow-up accepted on Mar 19, observations of CXOU J171405.7-381031 and Centaurus A coordinated with NuSTAR, and observations of Praesepe coordinated with Kepler.



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CXOUJ171405.7-38103 ACIS-S May 4 G1.9+0.3 ACIS-S Radiation Belts May 5 G1.9+0.3 ACIS-S ALPHACEN HRC-I May 7 3C277.2 ACIS-S NGC5044 ACIS-S Radiation Belts M10 ACIS-S May 8 deltaCep ACIS-I HD191612 ACIS-S/HETG May 9 G1.9+0.3 ACIS-S NGC5044 ACIS-S May 10 Radiation Belts NGC5044 ACIS-S May 11 GRB150314A ACIS-S May 12 HD191612 ACIS-S/HETG Radiation Belts May 13 CentaurusA ACIS-S/LETG SgrA* ACIS-S May 14 Abell1795outsk (2 obs) ACIS-I Radiation Belts May 15 Abell1795outskirts ACIS-I May 16 Praesepe ACIS-I CentaurusA ACIS-S/LETG May 17 Praesepe ACIS-I Radiation Belts May 18

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All spacecraft subsystems continued to support nominal operations.

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