GCN Circular 32006
Subject
GRB 220506A: Swift-XRT afterglow detection
Date
2022-05-07T09:10:00Z (2 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC &
INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), B.
Sbarufatti (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P.
Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf
of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 220506A (Urabe et al. GCN Circ. 32001) in a series of
observations tiled on the sky. The total exposure time is 1.2 ks,
distributed over 6 tiles; the maximum exposure at a single sky location
was 463 s. The data were collected between T0+38.2 ks and T0+55.6 ks,
and are entirely in Photon Counting (PC) mode.
An uncatalogued X-ray source is detected and is above the RASS 3-sigma
upper limit at this position, and is therefore likely the GRB
afterglow. The position of this source is RA, Dec=239.7257, -26.4186
which is equivalent to:
RA (J2000): 15:58:54.18
Dec(J2000): -26:25:06.9
with an uncertainty of 7.2 arcsec (radius, 90% confidence). This
position is 15.0 arcmin from the MAXI position. We cannot determine at
the present time whether the source is fading.
The results of the XRT-team automatic analysis of the likely afterglow
are at https://www.swift.ac.uk/xrt_products/TILED_GRB00105/Source1.php.
The results of the full analysis of the tiled XRT observations are
available at https://www.swift.ac.uk/xrt_products/TILED_GRB00105.
This circular is an official product of the Swift-XRT team.