{
  "bibcode": "2016GCN.20206....1D",
  "body": "A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), L.M. McCauley (PSU),\nJ.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), A.P. Beardmore (U.\nLeicester), S.L. Gibson (U. Leicester), P. D'Avanzo (INAF-OAB) and P.A.\nEvans (U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the MAXI-detected\nburst GRB 161123A (Hanyu et al. GCN Circ. 20203) in a series of\nobservations tiled on the sky. The total exposure time is 2.6 ks,\ndistributed over 7 tiles; the maximum exposure at a single sky location\nwas 825 s. The data were collected between T0+21.8 ks and T0+28.0 ks,\nand are entirely in Photon Counting (PC) mode. \n\nNo X-ray sources have been detected. The 3-sigma upper limit in the\nfield (not including the regions where the tiles overlap) ranges from\n~0.02 to ~0.05 ct s^-1, corresponding to a 0.3-10 keV observed flux of\n8.2e-13 to 1.9e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).\n\nThe results of the XRT-team automatic analysis of the tiled XRT\nobservations, including a position-specific upper limit calculator, are\navailable at http://www.swift.ac.uk/xrt_products/TILED_GRB00061.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 20206,
  "createdOn": 1479917554000,
  "email": "ab271@leicester.ac.uk",
  "subject": "GRB 161123A: Swift-XRT observations",
  "submitter": "Andy Beardmore at U Leicester  <ab271@leicester.ac.uk>",
  "eventId": "GRB 161123A"
}