GCN Circular 38819
Subject
GRB 250103A: Swift-XRT observations
Date
2025-01-04T09:24:43Z (5 days ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri
(INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea
(PSU), D.N. Burrows (PSU), M. A. Williams (PSU) and P.A. Evans (U.
Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the
SVOM/ECLAIRs-detected burst GRB 250103A, collecting 2.0 ks of Photon
Counting (PC) mode data between T0+24.1 ks and T0+47.2 ks.
One uncatalogued X-ray source has been detected within the estimated
3-sigma SVOM/ECLAIRs error region (454 arcsec), it is below the RASS
limit and shows no definitive signs of fading. However, it is
consistent with the position of the optical afterglow candidate (Li et
al. GCN 38795, Qiu et al. GCN 38802, Xu et al. GCN 38808). Details of
this source are given below:
Source 1:
RA (J2000.0): 22.0647 = 01:28:15.54
Dec (J2000.0): -5.0517 = -05:03:06.0
Error: 4.3 arcsec (radius, 90% conf.)
Count-rate: 0.0853 +/- 0.0076 ct s^-1
Distance: 172 arcsec from SVOM/ECLAIRs position.
Flux: (2.93 +/- 0.26)e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00021752.
This circular is an official product of the Swift-XRT team.