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Operations CXO Status Report

Friday 9 January 2015 10.00am EDT

Chandra entered Normal Sun Mode (NSM) at 3:23am EST on Jan 6 as the result of a reset of the Interface Unit (IU) on-board the spacecraft. Entry into NSM was nominal and assessment of the telemetry indicated that all spacecraft hardware was performing nominally. Engineering assessment suggested that the reset of the IU and subsequent transition to NSM was due to a single event upset and the decision was made to recover to normal pointing mode and continue with science. The recovery operations took place over Jan 6-7 and observations were resumed on Jan 9 at 6:31am EST with 180.6ks of science loss. The replanned schedule included an observation of Swift J123205.1-1056, which was accepted as a Director's Discretionary Time TOO on Jan 6. Scheduled observations that were impacted by the anomaly and replan will be rescheduled in future weeks.

In addition to the real-time procedures associated with the NSM recovery, a real-time procedure was executed on Jan 7 to initiate a long ACIS CTI data collection while waiting to return to observing and on Jan 9 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer.

A Chandra press release was issued on Jan 5 describing observations of the largest X-ray flare ever detected from the supermassive black hole at the center of the Milky Way galaxy. The supermassive black hole at the center of our galaxy, called Sagittarius A*, or Sgr A*, is estimated to contain about 4.5 million times the mass of our sun. Chandra caught this flare, which was 400 times brighter than the black hole's usual output, in September 2013. Researchers also saw a second large X-ray flare a little over a year later. Two theories are being considered to explain these large flares. For details see:

The schedule of targets for the next two weeks is shown below and includes an observation of 2MASS J06593158-040527, which was accepted as a Target of Opportunity on Dec 10, an observation of GRB 130427A, a follow-up observation of a TOO accepted on 2013 Dec 23, and observations of M82 and the Crab coordinated with NuStar and HST respectively.

Radiation Belts Jan 11 2MASSJ06593158-0405 ACIS-S Jan 12 3C120 ACIS-S/HETG tauCMa ACIS-S/HETG Jan 13 RCW103 ACIS-I Abell3411 ACIS-I Radiation Belts Jan 14 A667 ACIS-I HIP101364 ACIS-S/HETG TAur ACIS-S Jan 16 M82 ACIS-S NGC4144 ACIS-S A961 ACIS-I Radiation Belts Abell3411 ACIS-I Jan 17 MACSJ1149.5+2223 ACIS-I SDSSJ101548.90+0946 ACIS-S Jan 18 Crab ACIS-S GRB130427A ACIS-S Radiation Belts Jan 19 M82 ACIS-S Jan 20 J235535.83-011444.1 ACIS-I ZwCl2341.1+0000 ACIS-I CXOUJ164043.5-46313 ACIS-I Jan 21 Abell3411 ACIS-I Radiation Belts Jan 22 CXOUJ164043.5-46313 ACIS-I Abell3411 ACIS-I Jan 23 CXOUJ164043.5-46313 ACIS-I Abell3411 ACIS-I CXOUJ164043.5-46313 ACIS-I Jan 24 Radiation Belts CXOUJ164043.5-46313 ACIS-I Jan 25 Abell3411 ACIS-I


All spacecraft subsystems continued to support nominal operations.

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