GCN Circular 4672
Subject
Swift XRT Observation of GRB 060204C
Date
2006-02-05T05:02:35Z (19 years ago)
From
Dirk Grupe at PSU/Swift-XRT <grupe@astro.psu.edu>
D. Grupe, J. A. Kennea, and D. N. Burrows (PSU) report on behalf of the
Swift XRT team:
The Swift XRT began observing the field of BAT trigger 180274 (presumed
to be GRB 060204C) at 20:36:20 (157 seconds after the BAT trigger). In
the first 4 orbits of data (total exposure 8.0 ks) we find no evidence
for any source within the BAT error circle.
We place an upper limit of 1e-14 ergs/s/cm2 on any X-ray counterpart to
this event.
We do find a fairly bright source 8 arcminutes from the BAT position at
(RA, Dec, J2000) = (06:12:23.0, +70 12 42.9), but this object is not
fading and appears to be coincident with an object in the DSS (but not
in the ROSAT All-sky survey).
We note that it is extremely unusual for the XRT to slew promptly to a
long GRB and not find a bright X-ray source in the field of view. In
fact, there have been no previous cases in which the XRT slewed to a
long GRB field in less than 300 seconds and did not detect an afterglow.
This Circular is an official product of the Swift XRT Team.
[GCN OPS NOTE(05feb06): Per author's request, the Subject-line
was changed from "060402C" to "060204C".]