{
  "bibcode": "2021GCN.31305....1P",
  "body": "K. L. Page (U Leicester), S. D. Barthelmy (GSFC),\nN. P. M. Kuin (UCL-MSSL), A. Y. Lien (U Tampa),\nF. E. Marshall (NASA/GSFC), T. M. Parsotan (GSFC/UMBC/CRESSTII) and\nA. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 13:12:19 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 211225B (trigger=1090853).  Swift did not slew because\nof Sun constraint.  The BAT on-board calculated location is \nRA, Dec 258.568, +17.262 which is \n   RA(J2000)  =  17h 14m 16s\n   Dec(J2000) = +17d 15' 45\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve is missing data from T+8 to T+108\nsec, but there is an increase of 1400 event/sec at ~T+5 sec. \n\nDue to a Sun observing constraint, Swift cannot slew to the BAT\nposition until 23:13 UT on 2022 January 02. There will thus be no XRT\nor UVOT data for this trigger before this time. \n\nBurst Advocate for this burst is K. L. Page (kimlpage1978 AT gmail.com). \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": 31305,
  "createdOn": 1640438841000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 211225B: Swift detection of a burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 211225B"
}