{
  "bibcode": "2022GCN.31897....1D",
  "body": "V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), J. D. Gropp (PSU),\nJ.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U.\nLeicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB) and\nJ.D. Gropp (PSU) report on behalf of the Swift-XRT team:\n\nWe have analysed 7.8 ks of Photon Counting (PC) mode XRT data for the\nSwift-BAT-detected burst GRB 220412B (Gropp et al. GCN Circ. 31886),\ncollected between T0+4.7 ks and T0+29.1 ks. \n\nNo X-ray sources have been detected consistent with being within 296\narcsec of the Swift-BAT position. The 3-sigma upper limit in the field\nis 0.001 ct  s^-1, corresponding to a 0.3-10 keV observed flux of\n4.2e-14 erg cm^-2 s^-1 (assuming a typical GRB spectrum).\n\nFour uncatalogued sources were detected too far from the GRB position\nto be likely afterglow candidates.\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/01102329.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 31897,
  "createdOn": 1649874455000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 220412B: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 220412B"
}