[vsnet-grb-info 6851] GRB 081029: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Oct 29 18:11:44 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8443
SUBJECT: GRB 081029: Enhanced Swift-XRT position
DATE: 08/10/29 09:11:14 GMT
FROM: Phil Evans at U of Leicester <pae9 at star.le.ac.uk>
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 2569 s of XRT Photon Counting mode data and 3 UVOT
images for GRB 081029, 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 = 346.7729, -68.1561 which is equivalent
to:
RA (J2000): 23h 07m 5.51s
Dec (J2000): -68d 09' 21.9"
with an uncertainty of 1.5 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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