{
  "subject": "GRB 241127A: Swift-XRT refined Analysis",
  "circularId": 38364,
  "submittedHow": "email",
  "createdOn": 1732792038824,
  "bibcode": "2024GCN.38364....1M",
  "eventId": "GRB 241127A",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "body": "A. Melandri (INAF-OAR), S. Dichiara (PSU), J.A. Kennea (PSU), D.N.\nBurrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester),\nT. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A. Evans report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 5.0 ks of XRT data for GRB 241127A, from 443 s to 27.9\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=0.66 (+0.05, -0.06).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.97 (+0.18, -0.17). The\nbest-fitting absorption column is  8.0 (+4.5, -3.9) x 10^20 cm^-2, in\nexcess of the Galactic value of 2.7 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 3.4 x 10^-11 (4.0 x 10^-11) erg\ncm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     8.0 (+4.5, -3.9) x 10^20 cm^-2\nGalactic foreground: 2.7 x 10^20 cm^-2\nExcess significance: 2.2 sigma\nPhoton index:\t     1.97 (+0.18, -0.17)\n\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01270788.\n\nThis circular is an official product of the Swift-XRT team.\n"
}