[vsnet-grb-info 28131] GRB 210605B: Swift-XRT afterglow detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30234
SUBJECT: GRB 210605B: Swift-XRT afterglow detection
DATE:    21/06/14 14:06:06 GMT
FROM:    Aaron Tohuvavohu at U Toronto  <aaron.tohu at gmail.com>

A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU),
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), T.
Sbarrato (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of
the Swift-XRT team:

Swift-XRT has conducted further observations of the field of the
Swift/BAT-GUANO detected burst GRB 210605B (James DeLaunay et al. GCN
Circ. 30130). The observations now extend from T0+74.3 ks to T0+734.1
ks. 

Of the sources reported by D'Ai et al. (GCN Circ. 30146), "Source 1" is
fading with 2.5 sigma significance and thus is believed to be the GRB
afterglow.  The position of this source is RA, Dec=15.7456, -6.4290
which is equivalent to:

RA (J2000): 01:02:58.95
Dec(J2000): -06:25:44.3

with an uncertainty of 5.7 arcsec (radius, 90% confidence).  This
position is 2.4 arcmin from the Swift/BAT position. 

The light curve can be modelled with a power-law decay with a decay
index of alpha=0.8 (+0.7, -0.4).

The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00021450.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00021450.

This circular is an official product of the Swift-XRT team.