{
  "bibcode": "2020GCN.26884....1T",
  "body": "A. Tohuvavohu (U. Toronto), J.A. Kennea (PSU), J.P. Osborne (U.\nLeicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A.\nMelandri (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini\n(INAF-OAB), B. Sbarufatti (PSU) and A.Y. Lien report on behalf of the\nSwift-XRT team:\n\nWe have analysed 5.7 ks of XRT data for GRB 200125A (Lien et al. GCN\nCirc. 26876), from 127 s to 28.1 ks after the  BAT trigger. The data\ncomprise 286 s in Windowed Timing (WT) mode with the remainder in\nPhoton Counting (PC) mode. The enhanced XRT position for this burst was\ngiven by Beardmore et al. (GCN Circ. 26878). a rise, withpower-law\nindex .\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.523 (+/-0.029). The\nbest-fitting absorption column is  3.05 (+0.17, -0.16) x 10^21 cm^-2,\nin excess of the Galactic value of 7.7 x 10^20 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.17 (+0.19, -0.18)\nand a best-fitting absorption column of 1.3 (+0.5, -0.4) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 3.1 x 10^-11 (4.2 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     1.3 (+0.5, -0.4) x 10^21 cm^-2\nGalactic foreground: 7.7 x 10^20 cm^-2\nExcess significance: 2.0 sigma\nPhoton index:\t     2.17 (+0.19, -0.18)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00952164.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 26884,
  "createdOn": 1580039046000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 200125A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 200125A"
}