{
  "bibcode": "2022GCN.32173....1O",
  "body": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini\n(INAF-OAB), E. Ambrosi\t(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), D.N.\nBurrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), P.A. Evans (U.\nLeicester), A. Breeveld (UCL-MSSL) report on behalf of the Swift team:\n\nSwift-XRT has performed follow-up observations of the\nSwift/BAT-GUANO-detected burst GRB 220606B (Tohuvavohu et al., GCN\nCirc. 32167), collecting 4.9 ks of Photon Counting (PC) mode data\nbetween T0+44.9 ks and T0+68.8 ks. \n\nNo credible X-ray afterglow candidate has been detected within the\nBAT-GUANO error circle (Tohuvavohu, GCN Circ. 32170) down to a 0.3 - 10\nkeV count-rate upper limit of ~ 2e-3 ct/s (3sigma c.l.).\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/00021504.\n\nSwift-UVOT began settled observations 45.1 ks after the trigger. No\noptical afterglow consistent with the BAT-GUANO position is detected.\nThe 3.9 ks exposure in the white filter gives an upper limit of >21.9\nmag.\n\n\nThis circular is an official product of the Swift team.",
  "circularId": 32173,
  "createdOn": 1654608998000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 220606B: Swift follow-up observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 220606B"
}