{
  "body": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC &\nINAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A.\nTohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P.\nBeardmore (U. Leicester) and P.A. Evans report on behalf of the\nSwift-XRT team:\n\nWe have analysed 6.2 ks of XRT data for GRB 231214A, from 407 s to 45.5\nks after the  BAT trigger. The data are entirely in Photon Counting\n(PC) mode. \n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.48 (+/-0.08).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.4 (+/-0.4). The\nbest-fitting absorption column is  1.2 (+0.4, -0.3) x 10^22 cm^-2, in\nexcess of the Galactic value of 5.5 x 10^20 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum  is 4.2 x 10^-11 (1.2 x 10^-10) erg\ncm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     1.2 (+0.4, -0.3) x 10^22 cm^-2\nGalactic foreground: 5.5 x 10^20 cm^-2\nExcess significance: 5.4 sigma\nPhoton index:\t     2.4 (+/-0.4)\n\nIf the light curve continues to decay with a power-law decay index of\n1.48, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x\n10^-14 (1.9 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01202386.\n\nThis circular is an official product of the Swift-XRT team.\n",
  "bibcode": "2023GCN.35350....1O",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "eventId": "GRB 231214A",
  "circularId": 35350,
  "createdOn": 1702646873320,
  "submittedHow": "email",
  "subject": "GRB 231214A: Swift-XRT refined Analysis"
}