{
  "subject": "GRB 260921A: Swift detection of a burst",
  "submittedHow": "email",
  "circularId": 45676,
  "body": "K. L. Page (U Leicester), V. D'Elia (SSDC & INAF-OAR),\nS. Dichiara (PSU), R. A. J. Eyles-Ferris (U Leicester),\nN. P. M. Kuin (UCL-MSSL), D. M. Palmer (LANL), T. M. Parsotan (GSFC)\nand B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels\nSwift Observatory Team:\n\nAt 09:29:12 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 260921A (trigger=1512356).  Swift did not automatically slew\nto the burst. The BAT on-board calculated location is\nRA, Dec (145.373, +2.852), which is\n   RA(J2000) = 9h 41m 29s\n   Dec(J2000) = +2d 51' 08\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty).  The available BAT light curve (cut off at\nT+8 s) showed a complex structure with a duration of about 10 sec.\nThe peak count rate was ~4500 counts/sec (15-350 keV), at ~1 sec\nafter the trigger.\n\nSwift's automatic slews are currently disabled, and the burst is Sun\nconstrained until 8th October, so there will be no XRT or UVOT data for\nthis trigger.\n\nThis is the first BAT-triggered GRB since GRB 260127A.  Since then,\nSwift has been hibernating in preparation for the LINK reboost attempt.\nWith the rescope of that mission, Swift has been returned to\noperation and we will continue to make science observations for\nas long as possible until re-entry.\n\nBurst Advocate for this burst is K. L. Page (klp5 AT leicester.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/)\n",
  "eventId": "GRB 260921A",
  "createdOn": 1789984348691,
  "submitter": "K.L. Page at U Leicester <klp5@leicester.ac.uk>"
}