GCN Circular 15135
Subject
GRB 130828A: Swift XRT and UVOT observations
Date
2013-08-30T01:53:41Z (12 years ago)
From
Dirk Grupe at PSU/Swift-XRT <dxg35@psu.edu>
Dirk Grupe (PSU), Craig Swenson, and Mike Siegel
report on behalf of the Swift team:
Swift-XRT has observed the error circle of the Fermi/LAT GRB
130828A (Vianello & Sonbas, GCN Circ 15128)
in a series of observations tiled on the sky. In 2.5 ks of data,
beginning 105 ks after the Fermi/LAT trigger, we detect an
uncatalogued X-ray source at RA, Dec = 259.73234, 27.99570 which
is equivalent to:
RA (J2000.0) = 17h 18m 55.76s
Dec (J2000.0) = +27d 59' 44.5"
with an uncertainty of 4.1 arcsec (radius, 90% confidence).
This source is within the LAT error circle given in GCN circular
15128).
At the present time we cannot determine whether the source is
fading, therefore we cannot be certain whether this is the
afterglow of GRB 130828A or a serendipitous source.
The source was detected in observations with target ID 00020292.
The results of the automated XRT processing of this source are
available at
http://www.swift.ac.uk/xrt_products/TILED_GRB00018/20292/index_1.php
The Swift UVOT observed this field for 2.5 ks in the u filter.
There are two sources at the edge of the XRT error circle, one is a
Seyfert 1.9 galaxy, SDSS J171855.44+275947.4, which may be the
counter part of the X-ray source. However, the origin of the X-ray
source is unclear at this point.
This circular is an official product of the Swift team.