[vsnet-grb-info 6122] GRB 080520: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed May 21 13:33:14 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 7755
SUBJECT: GRB 080520: Enhanced Swift-XRT position
DATE: 08/05/21 04:32:43 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 497 s of overlapping XRT Photon Counting mode and UVOT
data for GRB 080520, 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 = 280.19385, -54.99160 which is equivalent
to:
RA (J2000): 18h 40m 46.52s
Dec (J2000): -54d 59' 29.8"
with an uncertainty of 1.9 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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