{
  "bibcode": "2021GCN.29929....1B",
  "body": "A. P. Beardmore (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU),\nN. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC),\nF. E. Marshall (NASA/GSFC), K. L. Page (U Leicester),\nB. Sbarufatti (PSU) and M. H. Siegel (PSU) report on behalf of the\nNeil Gehrels Swift Observatory Team:\n\nSwift Burst Alert Telescope (BAT) triggered and located GRB 210504A\n(trigger=1046782), with the trigger time most likely between 13:40\nand 13:58 UT. No BAT information is available at this moment. \n\nXRT began observing the field of the new trigger at 13:58:28 UT. \nIn a promptly-downlinked image we find an X-ray source at\nRA,Dec = 222.3933, -30.5322 which is equivalent to \n\nRA (J2000)  = 14:49:34.4\nDec (J2000) = -30:31:56\n\nwith an estimated uncertainty of about 10\". \n\nWe currently have very limited data products and are awaiting the \nfull data after a ground station pass to further characterise\nthis object. \n\nUVOT took a finding chart exposure of ���150 seconds with the ���white filter. \nNo credible afterglow candidate has been found in the initial data products. \nThe 2.7'x2.7' sub-image covers none of the XRT error circle. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. \nNo correction has been made for extinction in the Milky Way. \n\nBurst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). \nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)",
  "circularId": 29929,
  "createdOn": 1620139158000,
  "email": "pae9@star.le.ac.uk",
  "subject": "GRB 210504A: Swift detection of a burst",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>",
  "eventId": "GRB 210504A"
}