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

J. P. Osborne; A. P. Beardmore; O. Godet; A. F. Abbey; M. R. Goad; K. L. Page; A. A. Wells; L Angelini; 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

doi:10.1063/1.2207983

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

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Abstract

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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J. P. Osborne, A. P. Beardmore, O. Godet, A. F. Abbey, M. R. Goad, K. L. Page, A. A. Wells, L Angelini, 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. 2005-10-17. The in-flight spectroscopic performance of the Swift XRT CCD camera. https://doi.org/10.1063/1.2207983

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