{
  "eventId": "GRB 230623A",
  "subject": "GRB 230623A: Swift-XRT observations",
  "bibcode": "2023GCN.34081....1D",
  "circularId": 34081,
  "createdOn": 1687786917662,
  "body": "S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P.\nOsborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U.\nLeicester), E. Ambrosi\t(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M.\nPerri (SSDC & INAF-OAR) and P.A. Evans (U. Leicester) reports on behalf\nof the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the MAXI-detected\nburst GRB 230623A in a series of observations tiled on the sky. The\ntotal exposure time is 1.8 ks, distributed over 7 tiles; the maximum\nexposure at a single sky location was 807 s. The data were collected\nbetween T0+19.9 ks and T0+38.0 ks, and are entirely in Photon Counting\n(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 ~0.23 ct s^-1, corresponding to a 0.3-10 keV observed flux of\n6.1e-13 to 9.1e-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 https://www.swift.ac.uk/xrt_products/TILED_GRB00113.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>"
}