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Operations CXO Status Report

Friday 13 May 2005 9.00am EDT

During the last week the observing schedule was replanned to include an observation of GRB 050509b approved as a fast turn-around Target Of Opportunity (TOO) on May 8. Loads were replanned and uplinked on Mar 10. Observations of KS 1731-260 and 9 Sgr were impacted by the TOO and will be rescheduled for a later load. A second fast TOO was approved on May 11 to observe a high redshift blazar and loads were replanned and uplinked on May 12 for observation on May 13. The targets MACS0011.7-1523, PSS2322+1944, SDSS J0005-0006 and MACSJ0159.0-3412 were impacted and will be observed in a later load.

During a routine command load uplink on May 12 a ground system anomaly resulted in the uplink of an unexpected memory load to OBC-B. There was no operational impact from the uplink. Following checkout of the ground system and the development of a new ground monitor procedure, operations were continued in parallel with an investigation of the ground system problem. The OBC-B memory load was cleared with a real-time procedure on May 13.

A Chandra media telecon was held on May 10 to present a press release describing a long observation of the Orion Nebula. The data allowed the study the X-ray behavior of young Sun-like stars with ages between 1 and 10 million years and the discovery that these young stars produce violent X-ray outbursts that are much more frequent and energetic than seen from the Sun. For details see:

The schedule of targets for the next week is shown below and includes an observation of Sigma Gem coordinated with the VLA, VLBA and Merlin radio telescopes.

Radiation Belts                     May 15
Sigma Gem              ACIS-S/HETG  May 16
cl1354-0221            ACIS-I       May 17
Sigma Gem              ACIS-S/HETG
Radiation Belts                     May 18
RXJ0513.9-6951         HRC-S/LETG
IGR J16207-5129        ACIS-I       May 19
RXJ1856.5-3754         HRC-I     
Westerlund1            ACIS-S     
MACS1720.3+3536        ACIS-I       May 20
Radiation Belts
HD 179949              ACIS-S       May 21
M87                    ACIS-S     
PSR B1257+12           ACIS-S       May 22
HD 179949              ACIS-S


All spacecraft subsystems continued to support nominal operations.

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