A refined position catalogue of the Swift XRT afterglows

A. Moretti, M. Perri, M. Capalbi, L. Angelini, J. E. Hill, S. Campana, D. N. Burrows, J. P. Osborne, G. Tagliaferri, G. Cusumano, P. Giommi, P. Romano, T. Mineo, J. Kennea, D. Morris, J. Nousek, C. Pagani, J. Racusin, A. F. Abbey, A. P. BeardmoreO. Godet, M. R. Goad, K. L. Page, A. A. Wells, G. Chincarini

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43 Scopus citations


We present a catalogue of refined positions of 68 gamma ray burst (GRB) afterglows observed by the Swift X-ray Telescope (XRT) from the launch up to 2005 Oct. 16. This is a result of the refinement of the XRT boresight calibration. We tested this correction by means of a systematic study of a large sample of X-ray sources observed by XRT with well established optical counterparts. We found that we can reduce the systematic error radius of the measurements by a factor of two, from 6.5″ to 3.2″ (90% of confidence). We corrected all the positions of the afterglows observed by XRT in the first 11 months of the Swift mission. This is particularly important for the 37 X-ray afterglows without optical counterpart. Optical follow-up of dark GRBs, in fact, will be more efficient with the use of the more accurate XRT positions.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstronomy and Astrophysics
Issue number2
StatePublished - Mar 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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