The in-flight spectroscopic performance of the Swift XRT CCD camera during 2006-2007

O. Godet, A. P. Beardmore, A. F. Abbey, J. P. Osborne, K. L. Page, L. Tyler, D. N. Burrows, P. Evans, R. Starling, A. A. Wells, L. Angelini, S. Campana, G. Chinearini, O. Citterio, G. Cusumano, P. Giommi, J. E. Hill, J. Kennea, V. LaParola, V. ManganoT. Mineo, A. Moretti, J. A. Nousek, C. Pagani, M. Perri, M. Capalbi, P. Romano, G. Tagliaferri, F. Tamburelli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

The 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.

Original languageEnglish (US)
Title of host publicationUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
DOIs
StatePublished - Dec 1 2007
EventUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV - San Diego, CA, United States
Duration: Aug 26 2007Aug 27 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6686
ISSN (Print)0277-786X

Other

OtherUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
CountryUnited States
CitySan Diego, CA
Period8/26/078/27/07

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Godet, O., Beardmore, A. P., Abbey, A. F., Osborne, J. P., Page, K. L., Tyler, L., Burrows, D. N., Evans, P., Starling, R., Wells, A. A., Angelini, L., Campana, S., Chinearini, G., Citterio, O., Cusumano, G., Giommi, P., Hill, J. E., Kennea, J., LaParola, V., ... Tamburelli, F. (2007). The in-flight spectroscopic performance of the Swift XRT CCD camera during 2006-2007. In UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV [66860A] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6686). https://doi.org/10.1117/12.734180