{
  "createdOn": 1747471402450,
  "subject": "GRB 250515A: Swift-XRT observations",
  "bibcode": "2025GCN.40481....1C",
  "body": "M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC &\nINAF-OAR), D.N. Burrows (PSU), M.A. Williams (PSU), S. Dichiara (PSU),\nJ.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans\n(U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 250515A, centred on the location of\nGOTO25cqo (GCN 40464) collecting  4.5 ks of Photon Counting (PC) mode\ndata between T0+88.8 ks and T0+117.8 ks. \n\nNo X-ray sources have been detected within the estimated 3-sigma GOTO\nerror region (4.9 arcsec). The 3-sigma upper limit in the field ranges\nfrom ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed\nflux of 9.2e-14 to 1.4e-13 erg cm^-2 s^-1 (assuming a typical GRB\nspectrum).\n\nGOTO25cqo has since been classified as a type Ia supernova.\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/00021829.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 250515A",
  "circularId": 40481,
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email"
}