{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "body": "S. Campana (INAF-OAB), D.N. Burrows (PSU), S. Lanava (PSU), S. Dichiara\n(PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), 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 GRB 251111A. We\nsearched for X-ray sources in  2.1 ks of Photon Counting (PC) mode\ndata. The total exposure at the position of the afterglow (see below)\nis 2.1 ks, obtained between T0+7.6 ks and T0+36.9 ks.\n\nAn uncatalogued X-ray source is detected and is believed to be the\nafterglow. Using 305 s of PC mode data and 1 UVOT image, we find an\nenhanced XRT position (using the XRT-UVOT alignment and matching UVOT\nfield sources to the USNO-B1 catalogue): RA, Dec = 32.36166, +5.22815\nwhich is equivalent to:\n\nRA (J2000): 02h 09m 26.80s\nDec(J2000): +05d 13' 41.3\"\n\nwith an uncertainty of 5.1 arcsec (radius, 90% confidence). The\nobserved count rate was 2.5 (+1.2, -0.9)e-02 count/s at T0+7.7 ks,\nfalling to 5.2 (+2.6, -1.9)e-03 at T0+33.8 ks, which indicates the\nX-ray source is fading.\n\nThe results of the XRT-team automatic analysis are available at\nhttps://www.swift.ac.uk/xrt_products/03000189.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/SVOM/SVOM_FIELD00049.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "circularId": 42648,
  "subject": "GRB 251111A: Swift-XRT afterglow detection",
  "submittedHow": "email",
  "eventId": "GRB 251111A",
  "bibcode": "2025GCN.42648....1C",
  "createdOn": 1762944672387
}