GCN Circular 7247
Subject
GRB 080130: further Swift XRT observations confirm fading source
Date
2008-02-01T14:16:33Z (16 years ago)
From
Rhaana Starling at U of Leicester <rlcs1@star.le.ac.uk>
R.L.C. Starling, P.A. Evans, P.T. O'Brien (U. Leicester), C. Guidorzi
(U. Bicocca/INAF-OAB) and M. Stamatikos (GSFC/ORAU) report on behalf of
the Swift XRT team:
Swift XRT re-observed the field of possible ground-detected GRB 080130
(Copete et al., GCN 7242), approximately 34 hours after the burst. In
4.98ks of Photon Counting (PC) mode data starting 2008-01-31:16:01 and
ending 2008-01-31:20:51 we still detect an X-ray source inside the BATSS
error circle at the 3-sigma level (Starling and Stamatikos, GCN 7243). By
combining both XRT datasets for this field totalling ~7 ks we refine the
source position to RA,Dec=261.61484,-53.18742 deg, equivalent to:
RA (J2000)= 17h 26m 27.56s
Dec(J2000)= -53d 11' 14.7"
with an uncertainty of 5 arsec (radius, 90% confidence). This is 6.2
arcsec from the previously reported XRT position, and 2.2 arcmin from the
BATSS position.
The count rate of the source in this second observation is 0.004+/-0.001
counts/s. Compared to the earlier measured count rate of 0.010+/-0.002
counts/s we can confirm that the source has faded. We conclude that GRB
080130 was a real GRB, and that the source reported here is its X-ray
afterglow.
This is an official product of the Swift XRT team.