GCN Circular 39056
Subject
GRB 250127A: Swift-XRT observations
Date
2025-01-28T16:28:52Z (13 days ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.
Leicester), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro
(INAF-OAB), 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 250127A, collecting 2.9 ks of Photon
Counting (PC) mode data between T0+18.3 ks and T0+25.4 ks.
One uncatalogued X-ray sources have been detected within the estimated
90% SVOM/ECLAIRs error region (4.8 arcmin; GCN Circ. 39041), it is
below the RASS limit and shows no definitive signs of fading in the two
snapshot of observations that were taken. Details of this source are
given below:
Source 2:
RA (J2000.0): 169.6282 = 11:18:30.76
Dec (J2000.0): +3.3518 = +03:21:06.4
Error: 8.6 arcsec (radius, 90% conf.)
Count-rate: (2.9 [+1.5, -1.1])e-3 ct s^-1
Distance: 138 arcsec from SVOM/ECLAIRs position.
Flux: (3.3 [+1.7, -1.3])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
The source was also detected by the FXT telescope on board of Einstein
Probe (GCN Circ. 39053), which observed this field around the same time
of the XRT observations.
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/00021757.
This circular is an official product of the Swift-XRT team.