New Catalog of Astrometry Corrected Swift XRT GRB X-ray Afterglow Positions

Details New Catalog of Astrometry Corrected Swift XRT GRB X-ray Afterglow Positions New Catalog of Astrometry Corrected Swift XRT GRB X-ray Afterglow Positions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921208r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #212.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new catalog of astrometry corrected positions for Swift XRT detected GRB X-ray afterglows. These new positions have substantially smaller error radii than previous measurements for fields with long exposure times (>50 ks) and many (>10) serendipitous X-ray sources. We match these sources to ground based optical catalogs in a statistical manner that does not require specific assumptions about the morphology or SEDs of the objects being matched. We have tested and are able to quantify the accuracy of our methods using a subset of the GRBs with optical/UV/IR/radio afterglow counterparts. Improvements in XRT positions are a valuable asset in GRB host galaxy determination when an optical/UV/IR/radio afterglow is not detected.

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