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Operations CXO Status Report

Friday 28 February 2003 9.00am EST

During the last week the observing schedule was replanned to include an observation of the Gamma Ray Burster GRB030226 that was accepted as a 1 day turn-around Target Of Opportunity (TOO) on 26 Feb. An observation of OH231.8+4.2 was impacted by the TOO and will be rescheduled in a later load.

A current shift was observed in the output of Inertial Reference Unit-1 (IRU-1) on 25 Feb. The shift, from 155mA to 130mA during a 6 hour period is among the largest seen during the mission so far, however appears within family and conforms to occasional expected behavior from the units. An associated small gyro bias shift was also seen.

A Chandra press release was issued on 27 February that describes observations of the pulsar B1957+20 (the "Black Widow") that reveals the first direct evidence of an elongated cocoon of high-energy particles. For details see: http://chandra.harvard.edu/press/03_releases/press_022703.html.

The observing schedule for next week is shown below and includes observations of Cygnus X-1 coordinated with RXTE and NGC 2110 coordinated with XMM.

------------------------------------------
SDSS J115115.38+003826.9ACIS-S       Mar 2
DLS J1054-0549          ACIS-I
2MASSW J1207334-393254  ACIS-S       Mar 3
Radiation Belts
4U 1905+000             ACIS-S/HETG  Mar 4
Cygnus X-1              ACIS-S/HETG
NGC 2110                ACIS-S/HETG  Mar 5
Radiation Belts                      Mar 6
TV CRT                  ACIS-S/HETG  Mar 7
RCW103                  ACIS-S       Mar 8
2MASS135037-063216      ACIS-S
2MASS131704-173913      ACIS-S
NGC4691                 ACIS-S
DLS J1055-0503          ACIS-I
A3556                   ACIS-I

------------------------------------------

All spacecraft subsystems, with the exception of MUPS thruster A-1 as noted above, continued to operate nominally.

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