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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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