GCN Circular 37725
Subject
GRB 241001A: Swift-XRT afterglow detection
Date
2024-10-07T05:47:51Z (9 days ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
J.P. Osborne (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi
(INAF-IASFPA), M. Perri (SSDC & INAF-OAR), D.N. Burrows (PSU), M. A.
Williams (PSU), S. Dichiara (PSU), K.L. Page (U. Leicester) 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
SVOM/ECLAIRs-detected burst GRB 241001A. The observations now extend
from T0+6.5 ks to T0+456.2 ks.
Of the sources previously reported, "Source 2" is fading with >3-sigma
significance, and is therefore likely the GRB afterglow. As previously
noted, this source is spatially consistent with the optical afterglow
reported in GCNs 37673, 37677, 37678, 37679 and 37695.
Using 3254 s of PC mode data and 2 UVOT images, we find an enhanced XRT
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 20.55276, -43.47506 which is
equivalent to:
RA (J2000): 01h 22m 12.66s
Dec(J2000): -43d 28' 30.2"
with an uncertainty of 3.4 arcsec (radius, 90% confidence). This
position is 6.6 arcmin from the SVOM/ECLAIRs position. The source is
fading with alpha >0.3.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00021719.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00021719.
This circular is an official product of the Swift-XRT team.