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Proceedings Paper

Temperature dependent calibration products of the SWIFT x-ray telescope
Author(s): David C. Morris; David N. Burrows; Joanne E. Hill; Jamie Kennea; Judith Racusin; Paul Wood; Chris Mangels; Robert Klar; Lorella Angelini; Francesca Tamburelli
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Paper Abstract

The X-Ray Telescope (XRT) on board the Swift satellite is a sensitive imaging spectrometer utilizing a MAT-22 CCD at the Focal plane. The system was designed to operate the CCD at -100 °C +/- 1 °C for the duration of the mission. Due to a failure of the temperature control sub-system, the CCD operates under variable thermal conditions dictated by the view factor of the radiator- heatpipe sub-system to the Earth and sun. A temperature variation of up to 5° C is seen during a single orbit due to the satellite transition from sun light into eclipse and the full operational regime of the instrument ranges from temperatures of -75°C to -45°C due to the persistent heating/cooling effects of satellite orientation to the sun and earth. To maintain the highest quality data products possible from the XRT data stream, a recalibration of the XRT is required to account for this variable thermal environment. We present the methodology for and results from a temperature dependent analysis of on-orbit XRT data, collected during the Swift commissioning phase, used to produce gain, bias and warm pixel calibration products. We also discuss the quality of XRT science products capable with these temperature dependent calibration files and future plans for updates to these calibration products.

Paper Details

Date Published: 18 August 2005
PDF: 9 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58981N (18 August 2005); doi: 10.1117/12.618019
Show Author Affiliations
David C. Morris, Pennsylvania State Univ. (United States)
David N. Burrows, Pennsylvania State Univ. (United States)
Joanne E. Hill, Pennsylvania State Univ. (United States)
NASA Goddard Space Flight Ctr. (United States)
Jamie Kennea, Pennsylvania State Univ. (United States)
Judith Racusin, Pennsylvania State Univ. (United States)
Paul Wood, Southwest Research Institute (United States)
Chris Mangels, Southwest Research Institute (United States)
Robert Klar, Southwest Research Institute (United States)
Lorella Angelini, NASA Goddard Space Flight Ctr. (United States)
Francesca Tamburelli, ASI-ASDC (Italy)

Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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