[vsnet-grb-info 6796] GRB 081012 - Enhanced Swift XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Oct 21 00:54:00 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8391
SUBJECT: GRB 081012 - Enhanced Swift XRT position
DATE: 08/10/20 15:53:53 GMT
FROM: Phil Evans at U of Leicester <pae9 at star.le.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team:
Using 1387 s of XRT Photon Counting mode data and 2 UVOT images, we find
an astrometrically corrected X-ray position (using the XRT-UVOT alignment
and matching to the USNO-B1 catalogue): RA, Dec = 30.2009, -17.6383 which
is equivalent to:
RA (J2000): 02 00 48.22
Dec (J2000): -17 38 18.0
with an uncertainty of 1.8 arcsec (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 is an offical product of the Swift XRT team.
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