A refined position catalog of the Swift XRT afterglows

Details A refined position catalog of the Swift XRT afterglows A refined position catalog of the Swift XRT afterglows

2005-11-21

arxiv.org/abs/astro-ph/0511604v2

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, 1 table ; accepted for publication in A&A Letters. The revised version contains updated positions

Scientific paper

10.1051/0004-6361:200600007

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.

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