GCN Circular 43652
Subject
GRB 260208A: Swift-XRT observations
Event
Date
2026-02-08T21:51:33Z (2 days ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
S. Dichiara (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U.
Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G.
Bernardini (INAF-OAB), J.A. Kennea (PSU), D.N. Burrows (PSU) and P.A.
Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 260208A, collecting 3.4 ks of Photon
Counting (PC) mode data between T0+35.1 ks and T0+42.2 ks.
Six uncatalogued X-ray sources have been detected, with Source 1
located 2.2 arcsec from the new optical source seen by MASTER and GOTO
(GCN Circ. 43640 and 43641) and, therefore, consistent with that
source. The details of this new X-ray source are:
RA (J2000.0): 204.73150 = 13h 38m 55.56s
Dec (J2000.0): +33.80112 = +33d 48' 04.0"
Error: 2.5 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: 0.0488 +/- 0.0045 ct s^-1
Flux: (1.55 +/- 0.14)e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)
However, we cannot presently determine if the source is fading.
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/00021908.
This circular is an official product of the Swift-XRT team.