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The in-flight spectroscopic performance of the Swift XRT CCD camera

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arxiv astro-ph/0510489 v1 pith:NRA745CT submitted 2005-10-17 astro-ph

J. P. Osborne , A. P. Beardmore , O. Godet , A. F. Abbey , M. R. Goad , K. L. Page , A. A. Wells , L Angelini
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D. N. Burrows S. Campana G. Chincarini O. Citterio G. Cusumano P. Giommi J. E. Hill J. Kennea V. La Parola V. Mangano T. Mineo A. Moretti J. A. Nousek C. Pagani M. Perri P. Romano G. Tagliaferri F. Tamburelli
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keywords responsecalibrationcameradescribein-flightmodelprogramsources
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The Swift X-ray Telescope (XRT) focal plane camera is a front-illuminated MOS CCD, providing a spectral response kernel of 144 eV FWHM at 6.5 keV. We describe the CCD calibration program based on celestial and on-board calibration sources, relevant in-flight experiences, and developments in the CCD response model. We illustrate how the revised response model describes the calibration sources well. Loss of temperature control motivated a laboratory program to re-optimize the CCD substrate voltage, we describe the small changes in the CCD response that would result from use of a substrate voltage of 6V.

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