{
  "eventId": "GRB 260117A",
  "subject": "GRB 260117A: Swift-XRT afterglow detection",
  "body": "C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB), R. Brivio (INAF-OAB),\nD.N. Burrows (PSU), S. Lanava (PSU), S. Dichiara (PSU), J.P. Osborne\n(U. Leicester), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester)\nreports on behalf of the Swift-XRT team:\n\nSwift-XRT has conducted further observations of the field of the\nSVOM/ECLAIRs-detected burst GRB 260117A. The observations now extend\nfrom T0+12.5 ks to T0+153.1 ks and have a total exposure time of 5.7\nks.\n\nOf the sources previously reported, \"Source 1\" is fading with >3-sigma\nsignificance, and is therefore likely the GRB afterglow. Using 1064 s\nof PC mode data and 1 UVOT image, we find an enhanced XRT position\n(using the XRT-UVOT alignment and matching UVOT field sources to the\nUSNO-B1 catalogue): RA, Dec = 188.13864, +43.91274 which is equivalent\nto:\n\nRA (J2000): 12h 32m 33.27s\nDec(J2000): +43d 54' 45.9\"\n\nwith an uncertainty of 4.9 arcsec (radius, 90% confidence). This\nposition is 2.5 arcmin from the SVOM/ECLAIRs position, and 0.2 arcsec\nfrom the SVOM/VT optical candidate reported in GCN Circ. 43411.  The\nsource is fading with alpha >0.2.\n\nThe results of the XRT-team automatic analysis are available at\nhttps://www.swift.ac.uk/xrt_products/00021898.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021898.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "circularId": 43456,
  "bibcode": "2026GCN.43456....1S",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "createdOn": 1768853180348,
  "submittedHow": "email"
}