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The In-flight Spectroscopic Performance of the Swift XRT CCD Camera During 2006-2007The Swift X-ray Telescope focal plane camera is a front-illuminated MOS CCD, providing a spectral response kernel of 135 eV FWHM at 5.9 keV as measured before launch. 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. Comparison of observed spectra with models folded through the instrument response produces negative residuals around and below the Oxygen edge. We discuss several possible causes for such residuals. Traps created by proton damage on the CCD increase the charge transfer inefficiency (CTI) over time. We describe the evolution of the CTI since the launch and its effect on the CCD spectral resolution and the gain.
Document ID
20080039564
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Godet, O. (Leicester Univ. United Kingdom)
Beardmore, A.P. (Leicester Univ. United Kingdom)
Abbey, A.F. (Leicester Univ. United Kingdom)
Osborne, J.P. (Leicester Univ. United Kingdom)
Page, K.L. (Leicester Univ. United Kingdom)
Evans, P. (Leicester Univ. United Kingdom)
Starling, R. (Leicester Univ. United Kingdom)
Wells, A.A. (Leicester Univ. United Kingdom)
Angelini, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Burrows, D.N. (Pennsylvania State Univ. University Park, PA, United States)
Kennea, J. (Pennsylvania State Univ. University Park, PA, United States)
Campana, S. (Osservatorio Astronomico di Brera Merate, Italy)
Chincarini, G. (Osservatorio Astronomico di Brera Merate, Italy)
Citterio, O. (Osservatorio Astronomico di Brera Merate, Italy)
Cusumano, G. (INAF-IASF Italy)
LaParola, V. (INAF-IASF Italy)
Mangano, V. (INAF-IASF Italy)
Mineo, T. (INAF-IASF Italy)
Giommi, P. (Italian Space Agency Italy)
Perri, M. (Italian Space Agency Italy)
Capalbi, M. (Italian Space Agency Italy)
Tamburelli, F. (Italian Space Agency Italy)
Date Acquired
August 24, 2013
Publication Date
January 1, 2007
Publication Information
Publication: Submitted to SPIE Proceedings/SPIE.
Subject Category
Instrumentation And Photography
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: NAS50136
CONTRACT_GRANT: I/R/039/04
Distribution Limits
Public
Copyright
Public Use Permitted.

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