In-flight calibration of the Swift XRT point spread function

A. Moretti, S. Campana, T. Mineo, P. Romano, A. F. Abbey, L. Angelini, A. Beardmore, W. Burkert, D. N. Burrows, M. Capalbi, G. Chincarini, O. Citterio, G. Cusumano, M. J. Freyberg, P. Giommi, M. R. Goad, O. Godet, G. D. Hartner, J. E. Hill, J. KenneaV. La Parola, V. Mangano, D. Morris, J. A. Nousek, J. Osborne, K. Page, C. Pagani, M. Perri, G. Tagliaferri, F. Tamburelli, A. Wells

Research output: Contribution to journalConference articlepeer-review

18 Citations (SciVal)


The Swift X-ray Telescope (XRT) is designed to make astrometric, spectroscopic and photometric observations of the X-ray emission from Gamma-ray bursts and their afterglows, in the energy band 0.2-10 keV. Swift was successfully launched on 2004 November 20. Here we report the results of the analysis of Swift XRT Point Spread Function (PSF) as measured in the first four months of the mission during the instrument calibration phase. The analysis includes the study of the PSF of different point-like sources both on-axis and off-axis with different spectral properties. We compare the in-flight data with the expectations from the on-ground calibration. On the basis of the calibration data we built an analytical model to reproduce the PSF as a function of the energy and the source position within the detector which can be applied in the PSF correction calculation for any extraction region geometry.

Original languageEnglish (US)
Article number589818
Pages (from-to)1-9
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2005
EventUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV - San Diego, CA, United States
Duration: Aug 1 2005Aug 3 2005

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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