GCN Circular 3790
Subject
GRB 050813: Swift XRT afterglow localization
Event
Date
2005-08-13T12:28:59Z (21 years ago)
From
David Burrows at PSU/Swift <dxb15@psu.edu>
D. C. Morris, D. N. Burrows, J. A. Kennea, J. L. Racusin, N. Cucchiara, A.
Retter (PSU), and N. Gehrels (GSFC) report on behalf of the Swift XRT team:
The Swift XRT began observing the short burst GRB 050813 (Retter et al.,
GCN 3788) at 06:46:23, but was unable to obtain an on-board centroid due to
the lack of any bright source in the field of view. Analysis of the
ground-processed data finds a very faint (~0.01 cps), uncataloged source in
the first orbit of data at coordinates
RA(J2000) = 16:07:57
Dec(J2000) = +11:14:52
Because of the faintness of the source, we estimate an uncertainty of 10
arcseconds radius in this preliminary position.
This object is not visible in the second orbit. We therefore consider it
to be the afterglow of the GRB 050813. We note the similarity (in terms of
the extreme weakness of the X-ray counterpart) with short burst GRB 050509B.