The in-flight spectroscopic performance of the Swift XRT CCD camera
/ Authors
J. Osborne, A. Beardmore, O. Godet, A. Abbey, M. Goad, K. Page, A. Wells, L. Angelini, D. N. Burrows, S. Campana
and 16 more authors
G. Chincarini, O. Citterio, G. Cusumano, P. Giommi, J. Hill, J. Kennea, V. Laparola, V. Mangano, T. Mineo, A. Moretti, J. Nousek, C. Pagani, M. Perri, P. Romano, G. Tagliaferri, F. Tamburelli
/ 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.
Journal: SPIE Optics + Photonics
DOI: 10.1063/1.2207983