[vsnet-grb-info 6889] GRB 081104: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Nov 5 17:02:48 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8480
SUBJECT: GRB 081104: Enhanced Swift-XRT position
DATE: 08/11/05 08:02:38 GMT
FROM: Phil Evans at U of Leicester <pae9 at star.le.ac.uk>
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 4796 s of XRT Photon Counting mode data and 6 UVOT
images for GRB 081104, 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 = 100.4886, -54.7199 which is equivalent
to:
RA (J2000): 06h 41m 57.26s
Dec (J2000): -54d 43' 11.5"
with an uncertainty of 1.6 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position
can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is
described by Goad et al. (2007, A&A, 476, 1401
http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an
extension of this method.
This circular was automatically generated, and is an official product of the
Swift-XRT team.
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