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Operations CXO Status Report

Monday 10 April 2000 9.00am EDT

During last week the observing schedule was replanned to include two observations of the target Cygnus X-3 which was accepted as a Target Of Opportunity (TOO) following a major radio flare detection. Three targets were impacted: calibration observations of E0102-72.3, a portion of the observation of MCG-6-30-15 and the target RX-J1347-114. These targets are now planned for inclusion in a future schedule.

The revised schedule for last week is as follows.

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

MITG J0414+0534        ACIS-S          Apr  2



B2 0755+37             ACIS-S



W3B                    ACIS-I



BAL 1044+3656          ACIS-S          Apr  3



Q1331+170              ACIS-S



MKW 3S                 ACIS-I



1735-269               ACIS-S          Apr  4



E0102-72.3             ACIS-I



**Cyg X-3 TOO          ACIS-S/HETG



Radiation Belt



MCG-6-30-15            ACIS-S/HETG     Apr  5



**Cyg X-3 TOO          ACIS-S/HETG     Apr  6



UM 425                 ACIS-S



NGC 4406               ACIS-S



Radiation Belts                        Apr  7



Zeta Ori               ACIS-S/HETG



4U 1538-52             ACIS-I          Apr  8



RE 0751+14             HRC-S/LETG      Apr  9



Zeta Ori               ACIS-S/HETG



1E 0056.8-7154         ACIS-S



Radiation Belt


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

A real-time procedure was run at 7.30pm EDT on 4/7 with ACIS to test a new CCD clocking mode. The new mode (dubbed the "squeegee mode") has shown marked improvement in the energy resolution of chips in the laboratory that have been radiation damaged in a similar way to the front-side illuminated chips of ACIS. The test was successful and showed results consistent with the laboratory tests. A further set of tests are planned to optimize a number of parameters before uplinking as a permanent software patch to ACIS.

The planned observations for next week are as follows.

------------------------------------------
HD 37001               ACIS-I          Apr 10

IC 443                 ACIS-I

NGC 1569               ACIS-S

MITG J2019+1127        ACIS-S          Apr 11

A2029                  ACIS-S          Apr 12

PSR B1757-24           ACIS-S

Radiation Belts

Vela X-1               ACIS-S/HETG     Apr 13

Rho Oph Core           ACIS-I

Ophiuchi Mosaic        ACIS-I          Apr 14

V1494 Aql              ACIS-I

NGC 5055               ACIS-S

A1689                  ACIS-I          Apr 15

Virgo Cluster          ACIS-I

Radiation Belts

Q0957+561              ACIS-S

NGC 4631               ACIS-S          Apr 16

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

The spacecraft subsystems continued to operate nominally.

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