GCN Circular 43304

Subject

GRB 260102A: Swift-XRT observations

Event

GRB 260102A

Date

2026-01-02T14:37:52Z (13 hours ago)

From

Phil Evans at U of Leicester <pae9@star.le.ac.uk>

Via

M.G. Bernardini (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU), D.N.
Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester),
E. Ambrosi  (INAF-IASFPA) , M. Capalbi (INAF-OAR) 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 260102A, collecting  2.8 ks of Photon
Counting (PC) mode data between T0+9.6 ks and T0+26.1 ks. 

One uncatalogued X-ray source has been detected within the estimated
3-sigma SVOM/ECLAIRs error region (502 arcsec), it is below the RASS
limit and shows no definitive signs of fading. Therefore, at the
present time we cannot confirm this as the afterglow. Details of this
source are given below:

Source 2:
  RA (J2000.0):  183.9493  =  12h 15m 47.82s
  Dec (J2000.0): +48.2506  =  +48d 15' 02.1"
  Error: 6.2 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (6.3 [+2.2, -1.8])e-3 ct s^-1   
  Distance: 167 arcsec from SVOM/ECLAIRs position.
  Flux: (1.72 [+0.59, -0.48])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

SVOM/VT detected an optical counterpart consistent with this X-ray
source (GCN Circ. 43300Loading...
 
 ).

An uncatalogued source was also detected, however this was too far from
the GRB position to be the afterglow.

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/00021896.

This circular is an official product of the Swift-XRT team.