{
  "bibcode": "2021GCN.29529....1S",
  "body": "B. Sbarufatti (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL),\nA. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC) and\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 13:35:19 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 210218A (trigger=1033328).  Swift did not slew \nimmediately due to an observing constraint. \nThe BAT on-board calculated location is \nRA, Dec 47.291, +35.287 which is \n   RA(J2000) = 03h 09m 10s\n   Dec(J2000) = +35d 17' 14\"\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 30 sec.  The peak count rate\nwas ~800 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nDue to a Moon observing constraint, Swift cannot slew to the BAT\nposition until 11:37 UT on 2021 February 20. There will thus be no XRT\nor UVOT data for this trigger before this time. \n\nBurst Advocate for this burst is B. Sbarufatti (bxs60 AT psu.edu). \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": 29529,
  "createdOn": 1613655955000,
  "email": "klp5@leicester.ac.uk",
  "subject": "GRB 210218A: Swift detection of a burst",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "GRB 210218A"
}