{
  "createdOn": 1761595455785,
  "eventId": "GRB 251026B",
  "subject": "GRB 251026B: Swift-XRT observations of GOTO25jgl/AT2025absf",
  "circularId": 42491,
  "bibcode": "2025GCN.42491....1O",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "body": "J.P. Osborne (U. Leicester), C. Salvaggio (INAF-OAB), M. Ferro\n(INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Lanava (PSU),\nS. Dichiara (PSU), K.L. Page (U. Leicester) and P.A. Evans (U.\nLeicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 251026B, collecting  2.0 ks of Photon\nCounting (PC) mode data between T0+116.7 ks and T0+122.7 ks, centred on\nthe tentative GOTO optical counterpart candidate (GCN Circ. 42470). \n\nNo X-ray sources have been detected consistent with the estimated\n3-sigma GOTO error region (0.8 arcsec). The 3-sigma upper limit in the\nfield ranges from ~0.004 to ~0.005 ct s^-1, corresponding to a 0.3-10\nkeV observed flux of 1.7e-13 to 2.1e-13 erg cm^-2 s^-1 (assuming a\ntypical GRB spectrum).\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/00021872.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "submittedHow": "email"
}