GCN Circular 42518
Subject
GRB 251022A: Swift-XRT confirmation of fading
Event
Date
2025-10-29T19:49:57Z (a day ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
D.N. Burrows (PSU), S. Lanava (PSU), S. Dichiara (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), M. Capalbi (INAF-OAR), M.
Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR) and P.A. Evans (U.
Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has conducted further observations of the field of the
Fermi/LAT-detected burst GRB 251022A. The observations now extend from
T0+38.6 ks to T0+575.9 ks and have a total exposure time of 6.6 ks. .
The previously-reported "Source 4" (Burrows et al., GCN Circ. 42417),
coincident with GOTO25iym, is now found to be fading with >3-sigma
significance, and is therefore likely the GRB afterglow.
The results of the XRT-team automatic analysis are available at
https://www.swift.ac.uk/xrt_products/00021864.
The results of the full analysis of the tiled XRT observations are
available at https://www.swift.ac.uk/xrt_products/TILED_GRB00139.
This circular is an official product of the Swift-XRT team.