[vsnet-grb-info 4366] GRB070224: Swift-XRT Astrometrically Corrected
Position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Feb 27 04:22:36 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6151
SUBJECT: GRB070224: Swift-XRT Astrometrically Corrected Position
DATE: 07/02/26 19:22:30 GMT
FROM: Judith Racusin at PSU <racusin at astro.psu.edu>
J. Racusin (PSU), M. Goad (U. Leicester), D.N. Burrows (PSU), O. Godet (U.
Leicester), R. Starling (U. Leicester) report on behalf of the Swift XRT
team:
Based on an accurate mapping between the XRT and UVOT detector coordinate
systems, we have used the simultaneous UVOT V-band images to
astrometrically correct (relative to stellar catalogues, e.g. USNO-B1) the
XRT world coordinate system, and thereby refine the XRT position. We
obtain a new XRT position at RA,Dec=179.02792,-13.3304 which is:
RA(J2000): 11h 56m 06.7s
Dec(J2000): -13d 19' 49.6"
with an uncertainty of 2.6 arcseconds (90% containment). This is 3.8
arcseconds from the refined XRT position (Racusin et al., GCN 6143), and
2.0 arcseconds from the optical candidate first identified by Thoene et
al. (GCN 6142).
This circular is an official product of the Swift-XRT team.
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