{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "body": "D.N. Burrows (PSU), S. Lanava (PSU), S. Dichiara (PSU), J.P. Osborne\n(U. Leicester), K.L. Page (U. Leicester), S. Campana (INAF-OAB), A.\nMelandri (INAF-OAR), T. Sbarrato (INAF-OAB) 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 260127B (The Fermi GBM team, GCN Circ.\n43533), collecting  985 s of Photon Counting (PC) mode data between\nT0+70.4 ks and T0+71.4 ks. \n\nNo X-ray sources have been detected consistent with the tentative GOTO\noptical afterglow candidate (O’Neill et al, GCN Circ. 43538). The\n3-sigma upper limit in the field ranges from ~0.01 to ~0.02 ct s^-1,\ncorresponding to a 0.3-10 keV observed flux of 5.0e-13 to 6.9e-13 erg\ncm^-2 s^-1 (assuming a typical 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/00021900.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 260127B",
  "bibcode": "2026GCN.43558....1B",
  "createdOn": 1769702398947,
  "circularId": 43558,
  "submittedHow": "email",
  "subject": "GRB 260127B: Swift-XRT observations"
}