{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "eventId": "GRB 250103A",
  "body": "A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri\n(INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea\n(PSU), D.N. Burrows (PSU), M. A. Williams (PSU) and P.A. Evans (U.\nLeicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nSVOM/ECLAIRs-detected burst GRB 250103A, collecting  2.0 ks of Photon\nCounting (PC) mode data between T0+24.1 ks and T0+47.2 ks. \n\nOne uncatalogued X-ray source has been detected within the estimated\n3-sigma SVOM/ECLAIRs error region (454 arcsec), it is below the RASS\nlimit and shows no definitive signs of fading. However, it is\nconsistent with the position of the optical afterglow candidate (Li et\nal. GCN 38795, Qiu et al. GCN 38802, Xu et al. GCN 38808). Details of\nthis source are given below:\n\nSource 1:\n  RA (J2000.0):  22.0647  =  01:28:15.54\n  Dec (J2000.0): -5.0517  =  -05:03:06.0\n  Error: 4.3 arcsec (radius, 90% conf.)\n  Count-rate: 0.0853 +/- 0.0076 ct s^-1   \n  Distance: 172 arcsec from SVOM/ECLAIRs position.\n  Flux: (2.93 +/- 0.26)e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/00021752.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "createdOn": 1735982683170,
  "subject": "GRB 250103A: Swift-XRT observations",
  "submittedHow": "email",
  "circularId": 38819,
  "bibcode": "2025GCN.38819....1B"
}