GCN Circular 19073
Subject
GRB 160221A: Swift-XRT afterglow detection
Date
2016-02-25T07:48:54Z (8 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
A. Melandri (INAF-OAB), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M.
McCauley (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U.
Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) 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
INTEGRAL-detected burst GRB 160221A (Mereghetti et al. GCN Circ.
19046). The observations now extend from T0+21.3 ks to T0+274.5 ks. The
source previously reported by Melandri et al. (GCN Circ. 19050),
"Source 1", is fading with 3-sigma significance, and is therefore
likely the GRB afterglow. The position of this source is RA,
Dec=232.0895, -28.4551 which is equivalent to:
RA (J2000): 15:28:21.48
Dec(J2000): -28:27:18.4
with an uncertainty of 4.1 arcsec (radius, 90% confidence). This
position is 80 arcsec from the INTEGRAL position. The source is fading
with alpha >0.5.
The results of the XRT-team automatic analysis of the likely afterglow
are at http://www.swift.ac.uk/ToO_GRBs/00020600/index_1.php.
The results of the full analysis of the XRT observations are available
at http://www.swift.ac.uk/ToO_GRBs/00020600.
This circular is an official product of the Swift-XRT team.