{
  "bibcode": "2021GCN.30250....1B",
  "body": "M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB),\nH. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB),\nK. L. Page (U Leicester), D. M. Palmer (LANL), T. Sbarrato (INAF-OAB)\nand M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 01:43:37 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 210618A (trigger=1056426).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 235.820, +46.043 which is \n   RA(J2000) = 15h 43m 17s\n   Dec(J2000) = +46d 02' 36\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a complex\nstructure with a duration of about 3 sec.  The peak count rate\nwas ~3600 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began observing the field at 01:44:42.2 UT, 65.3 seconds after\nthe BAT trigger. No source was detected in the 2.5-s promptly available\nimage. Due to a short visibility interval, no further data were immediately \ncollected. We are waiting for the full dataset to detect and localise the\nXRT counterpart. \n\nDue to the short visibility window, UVOT data are not available at this time. \n\nBurst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.inaf.it). \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": 30250,
  "createdOn": 1623982160000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 210618A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 210618A"
}