{
  "bibcode": "2023GCN.34470....1B",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "eventId": "GRB 230816A",
  "body": "M.G. Bernardini (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A.\nKennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester),\nE. Ambrosi  (INAF-IASFPA) , M. Capalbi (INAF-IASFPA) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 3.9 ks of XRT data for GRB 230816A, from 97 s to 91.3\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=1.44 (+0.27, -0.43).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.66 (+0.31, -0.14). The\nbest-fitting absorption column is  consistent with the Galactic value\nof 2.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum  is 4.4 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     2.9 (+/-1.2) x 10^21 cm^-2\nGalactic foreground: 2.9 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     1.66 (+0.31, -0.14)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01185673.\n\nThis circular is an official product of the Swift-XRT team.\n",
  "createdOn": 1692307272897,
  "circularId": 34470,
  "subject": "GRB 230816A: Swift-XRT refined Analysis",
  "submittedHow": "email"
}