GCN Circular 32530
Subject
GRB 220907A: Swift-XRT refined Analysis
Event
Date
2022-09-08T07:04:49Z (4 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
K. L. Page (U Leicester) reports on behalf of the Swift-XRT team:
We have analysed 5.6 ks of XRT data for GRB 220907A (Page et al. GCN
Circ. 32526), from 100 s to 21.5 ks after the BAT trigger. The data
are entirely in Photon Counting (PC) mode. Using 188 s of PC mode data
and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT
alignment and matching UVOT field sources to the USNO-B1 catalogue):
RA, Dec = 268.87315, -20.28950 which is equivalent to:
RA (J2000): 17h 55m 29.56s
Dec(J2000): -20d 17' 22.2"
with an uncertainty of 4.0 arcsec (radius, 90% confidence). The source
is fading with alpha >0.4.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01123129.
This circular is an official product of the Swift-XRT team.