{
  "subject": "GRB 250330A: Swift detection of a burst",
  "circularId": 39938,
  "body": "S. B. Cenko (GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 06:07:38 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 250330A (trigger=1299776).  Swift slewed immediately to the burst.\nThe BAT on-board calculated location is \nRA, Dec 252.790, -86.870 which is \n   RA(J2000) = 16h 51m 10s\n   Dec(J2000) = -86d 52' 11\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single peak\nstructure with a duration of about 10 sec.  The peak count rate\nwas ~5800 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 06:08:51.3 UT, 73.2 seconds after\nthe BAT trigger. Due to the proximity of Swift to the SAA, XRT centroided on\na cosmic ray. Given the short visibility window, no other data are available\nat this time.\n\nUVOT data are not available at this time.\n\nAlthough this trigger occurred while Swift was close to the SAA, the\nBAT light-curve shows a definite peak, and Fermi-GBM also triggered at the\nsame time.\n\nBurst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov).\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\n",
  "createdOn": 1743316096866,
  "submittedHow": "email",
  "bibcode": "2025GCN.39938....1C",
  "eventId": "GRB 250330A",
  "submitter": "K.L. Page at U Leicester <klp5@leicester.ac.uk>"
}