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Operations CXO Status Report

Tuesday 14 September 1999 11.00am EST

During the last 24 hours the ACIS bakeout completed nominally. The focal plane was kept warm (approx 31 deg C) for 4 hours before being cooled to -100 deg C. The SIM was moved to allow calibration source measurements to be made with ACIS after the bakeout and then translated back to have ACIS-S at the focal point for radiation belt entry. Initial analysis of real-time data readout from ACIS after the bakeout did not show improvement in the energy resolution of the front-illuminated chips. Data from the back-illuminated chips continued to indicate no change in performance since launch.

Following the radiation belt exit at 2.30PM 9/14, the next load will perform a long (200Ks) observation of HR1099 with ACIS-S and HETG, portions of which will be coordinated with Hubble.

Analysis of the grating anomaly has concluded and indicates that a time delay in the daily load needed to be increased to allow time for the flight software to complete commanding. This change has been incorporated into the next load.





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