{
  "bibcode": "2024GCN.38209....1B",
  "eventId": "GRB 241113A",
  "body": "A.P. Beardmore (U. Leicester), M. Ferro (INAF-OAB), R. Brivio\n(INAF-OAB), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), D.N. Burrows\n(PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 7.7 ks of XRT data for GRB 241113A, from 60 s to 34.4\nks after the  BAT trigger. The data comprise 75 s in Windowed Timing\n(WT) mode (the first 10 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode. \n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=1.90 (+/-0.24), followed by a break at T+165 s to an\nalpha of 0.92 (+0.04, -0.05).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.32 (+0.33, -0.30). The\nbest-fitting absorption column is  2.2 (+1.1, -0.9) x 10^21 cm^-2, in\nexcess of the Galactic value of 2.0 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 3.2 x 10^-11 (5.1 x 10^-11) erg\ncm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     2.2 (+1.1, -0.9) x 10^21 cm^-2\nGalactic foreground: 2.0 x 10^20 cm^-2\nExcess significance: 3.7 sigma\nPhoton index:\t     2.32 (+0.33, -0.30)\n\nIf the light curve continues to decay with a power-law decay index of\n0.92, the count rate at T+24 hours will be 8.0 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.5 x\n10^-13 (4.1 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/01267501.\n\nThis circular is an official product of the Swift-XRT team.\n",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email",
  "subject": "GRB 241113A: Swift-XRT refined Analysis",
  "createdOn": 1731544153697,
  "circularId": 38209
}