{
  "bibcode": "2019GCN.26094....1D",
  "body": "P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (PSU), D.N.\nBurrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester),\nM.G. Bernardini (INAF-OAB), E. Ambrosi\t(INAF-IASFPA)  and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 9.0 ks of XRT data for GRB 191029A (Evans et al. GCN\nCirc. 26088), from 4.0 ks to 27.7 ks after the\tBAT trigger. The data\nare entirely in Photon Counting (PC) mode. The refined XRT position is\nRA, Dec = 352.1492, -40.5661 which is equivalent to:\n\nRA (J2000): 23 28 35.80\nDec(J2000): -40 33 58.0\n\nwith an uncertainty of 3.6 arcsec (radius, 90% confidence). The light\ncurve is consistent with a constant source of mean count rate 8.2e-02\nct/sec. A power-law fit gives an index of 0.08 (+0.12, -0.13).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.54 (+0.16, -0.10). The\nbest-fitting absorption column is  1.92 (+3.90, -0.14) x 10^20 cm^-2,\nconsistent with the Galactic value of 1.8 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 (4.0 x\n10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     1.92 (+3.90, -0.14) x 10^20 cm^-2\nGalactic foreground: 1.8 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     1.54 (+0.16, -0.10)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00932058.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 26094,
  "createdOn": 1572389381000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 191029A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 191029A"
}