GCN Circular 8148
Subject
Enhanced Swift-XRT position of SGR 0501+4516
Date
2008-08-27T19:10:32Z (16 years ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
P.A. Evans and J.P. Osborne (U. Leicester) report on behalf of the
Swift-XRT team:
Using 9.1 ks of XRT Photon Counting mode data and 35 UVOT images, we find
an astrometrically corrected X-ray position for SGR 0501+4516 (using the
XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 75.27834, +45.27649 which is equivalent to:
RA (J2000): 05h 01m 6.80s
Dec (J2000): +45d 16' 35.4"
with an uncertainty of 1.4 arcsec (radius, 90% confidence). This
position is consistent with the possible infra-red counterpart (Tanvir &
Varricatt, GCN Circ. 8126).
The position enhancement process 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 official product of the Swift-XRT team.