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GCN Circular 35852

GRB 240215A: Swift-XRT afterglow detection
2024-03-03T16:24:26Z (5 months ago)
Phil Evans at U of Leicester <>
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A.P. Beardmore (U. Leicester), C. Salvaggio (INAF-OAB), M.
Ferro (INAF-OAB), R. Brivio (INAF-OAB), J. D. Gropp (PSU), S. Dichiara
(PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT

Swift-XRT has performed follow-up observations of the
Swift/BAT-detected burst GRB 240215A in a series of observations tiled
on the sky. The total exposure time is 4.4 ks, distributed over 4
tiles; the maximum exposure at a single sky location was 2.7 ks. The
data were collected between T0+44.5 ks and T0+1384.7 ks, and are
entirely in Photon Counting (PC) mode. 

Four uncatalogued X-ray sources are detected, of which one ("Source 2")
is fading with >3-sigma significance, and is therefore likely the GRB
afterglow.  The position of this source is RA, Dec=132.0101, -6.5099
which is equivalent to:

RA (J2000): 08:48:2.42
Dec(J2000): -06:30:35.5

with an uncertainty of 8.1 arcsec (radius, 90% confidence).  This
position is 14.9 arcmin from the Swift/BAT position.  The source is
fading with alpha >0.5.

The results of the XRT-team automatic analysis are available at
The results of the full analysis of the tiled XRT observations are
available at

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

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