{
  "bibcode": "2018GCN.23192....1O",
  "body": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore\n(U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P.\nD'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU),\nD.N. Burrows (PSU) and P.A. Evans (U. Leicester) report on behalf of\nthe Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the MAXI-detected\nburst GRB 180829A (Yamada et al. GCN Circ. 23186) in a series of\nobservations tiled on the sky. The total exposure time is 1.4 ks,\ndistributed over 7 tiles; the maximum exposure at a single sky location\nwas 420 s. The data were collected between T0+56.4 ks and T0+57.9 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~0.03 to ~0.11 ct s^-1, corresponding to a 0.3-10 keV observed flux of\n1.1e-12 to 4.4e-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_GRB00073.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 23192,
  "createdOn": 1535616655000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 180829A: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 180829A"
}