GCN Circular 15424
Subject
GRB 131031A: Swift-XRT observations
Date
2013-11-01T06:36:03Z (10 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
B.P. Gompertz and K.L. Page (U. Leicester) report on behalf of the
Swift-XRT team:
We have analysed 3.7 ks of XRT data for the Swift/BAT-detected burst:
GRB 131031A, from 39.7 ks to 52.0 ks after the Swift/BAT trigger. The
data are entirely in Photon Counting (PC) mode. An X-ray source is
detected within the Swift/BAT error circle. Using 1649 s of PC mode
data and 1 UVOT images, we find an enhanced XRT position (using the
XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 29.61022, -1.57882 which is equivalent to:
RA (J2000): 01h 58m 26.45s
Dec(J2000): -01d 34' 43.7"
with an uncertainty of 4.7 arcsec (radius, 90% confidence). This
position is 91 arcsec from the Swift/BAT position. The source has a
mean count rate of 8.8e-03 ct/sec; we cannot determine at the present
time whether it is fading.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020317.
This circular is an official product of the Swift-XRT team.