[vsnet-grb-info 8348] GRB 090902B: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 3 15:25:20 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9871
SUBJECT: GRB 090902B: Enhanced Swift-XRT position
DATE: 09/09/03 06:25:14 GMT
FROM: Phil Evans at U of Leicester <pae9 at star.le.ac.uk>
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team.
Using 2.7 ks of XRT Photon Counting mode data and 2 UVOT images for GRB
090902B, we find an astrometrically corrected X-ray position (using the
XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 264.93859, 27.32448 which is equivalent to:
RA (J2000): 17h 39m 45.26s
Dec (J2000): +27d 19' 28.1"
with an uncertainty of 2.1 arcsec (radius, 90% confidence).
Position enhancement is described by Goad et al. (2007, A&A, 476, 1401)
and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
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