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Operations CXO Status Report

Friday 4 July 2003 8.30am EDT

During the last week the observing schedule was interrupted for a Target of Opportunity observation of Mrk421 on July 1.

Preparations continue on schedule for the planned swap from IRU-1 to IRU-2 gyros on July 19. The IRU-1 gyro-1 current remains noisy with a base level near 150 mA.

Of note last week, changes were made to the flight software on July 2 to improve power sub-system manangement for eclipses, which also resulted in simpler ground operations for eclipses and improved autonomous power management.

The ground system was reverted to ONLS 3.8.2 on June 27, while issues with command script processing are resolved in ONLS 3.9.3. Normal flight operations were continued without interruption during the ground system update.

A Chandra press release was issued on June 30 describing a series of observations of a jet of high-energy particles emanating from the Vela pulsar, which show unprecedented rapid variability in the both the shape and brightness of the jet. For details see:

The observing schedule for next week is shown below, which includes coordinated observations of 3C273 with the XMM and Integral observatories and of Baade's Window with HST.

3C273                  ACIS-S/LETG  Jul  7
SNR1987A               ACIS-S       Jul  8
Radiation Belts                     Jul  9
SS 433                 ACIS-S       Jul 10
Radiation Belts                     Jul 11
2MASS175504+675108     ACIS-S       Jul 11
IC 1218                ACIS-S       Jul 12
FIRST 1309+5733        ACIS-S       Jul 12
FIRST J162901+400759   ACIS-S       Jul 12
AX J1845-0258          ACIS-S       Jul 12
SAGITTARIUS DSPH       ACIS-I       Jul 12
NGC 6541               ACIS-S       Jul 12
RCW103                 ACIS-I       Jul 13
TERZAN 5               ACIS-S       Jul 13


All spacecraft subsystems, with the exception of the MUPS thruster A-1 under investigation, continued to operate nominally.

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