{
  "createdOn": 1790408062546,
  "eventId": "GRB 260925A",
  "body": "J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.\nLeicester), M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), A. D'Ai\n(INAF-IASFPA), D.N. Burrows (PSU), S. Lanava (PSU) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 4.2 ks of XRT data for GRB 260925A, from 119 s to 28.6\nks after the   trigger. The data are entirely in Photon Counting (PC)\nmode. \n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=2.95 (+0.30, -0.25).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.6 (+0.5, -0.4). The\nbest-fitting absorption column is  9 (+24, -6) x 10^20 cm^-2,\nconsistent with the Galactic value of 3.6 x 10^20 cm^-2 (Willingale et\nal. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux\nconversion factor deduced from this spectrum  is 4.3 x 10^-11 (4.8 x\n10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     9 (+24, -6) x 10^20 cm^-2\nGalactic foreground: 3.6 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     1.6 (+0.5, -0.4)\n\nIf the light curve continues to decay with a power-law decay index of\n2.95, the count rate at T+24 hours will be 8.9 x 10^-9 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.8 x\n10^-19 (4.3 x 10^-19) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttps://www.swift.ac.uk/xrt_products/01513316.\n\nThis circular is an official product of the Swift-XRT team.\n",
  "circularId": 45755,
  "subject": "GRB 260925A: Swift-XRT refined Analysis",
  "submittedHow": "email",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>"
}