{
  "circularId": 37732,
  "createdOn": 1728318122136,
  "eventId": "GRB 241006A",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "bibcode": "2024GCN.37732....1S",
  "body": "B. Sbarufatti (INAF-OAB), D.N. Burrows (PSU), M. A. Williams (PSU), S.\nDichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester),\nC. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB) and P.A. Evans report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 7.8 ks of XRT data for GRB 241006A, from 295 s to 50.5\nks after the  BAT trigger. The data comprise 23 s in Windowed Timing\n(WT) mode with the remainder in Photon Counting (PC) mode. \n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=3.3 (+0.4, -0.3).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.73 (+0.28, -0.20). The\nbest-fitting absorption column is  6.4 (+8.3, -1.5) x 10^20 cm^-2,\nconsistent with the Galactic value of 4.9 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 3.9 x 10^-11 (4.3 x\n10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     6.4 (+8.3, -1.5) x 10^20 cm^-2\nGalactic foreground: 4.9 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     1.73 (+0.28, -0.20)\n\nIf the light curve continues to decay with a power-law decay index of\n3.3, the count rate at T+24 hours will be 3.1 x 10^-8 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x\n10^-18 (1.3 x 10^-18) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01258721.\n\nThis circular is an official product of the Swift-XRT team.\n",
  "submittedHow": "email",
  "subject": "GRB 241006A: Swift-XRT refined Analysis"
}