{
  "bibcode": "2022GCN.32984....1T",
  "body": "Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay\n(UAlabama), Jamie A. Kennea (PSU) report:\n\nSwift/BAT did not localize GRB 221124A onboard (T0:\n2022-11-24T02:00:24 UTC, CALET trig 1353290389, GECAM trig 79).\n\nThe CALET and GECAM notices, distributed in near real-time, triggered\nthe Swift Mission Operations Center operated Gamma-ray Urgent Archiver\nfor Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger, GUANO sent a command to the Swift Burst Alert Telescope\n(BAT) to save 200 seconds of BAT event-mode data from [-50,+150]\nseconds around the time of the burst. All the requested event mode\ndata was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu,\narXiv:2111.01769), detects the burst with a sqrt(TS) of 8 in a 1.024 s\nanalysis time bin.\n\nNITRATES results, independently, are ambiguous with respect to whether\nthis burst originates from in or outside the BAT FOV.\nThe GECAM localization places this burst outside the contemporaneous BAT FoV.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief\ndescriptions and interpretation of sqrt(TS), DeltaLLHPeak, and\nDeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/",
  "circularId": 32984,
  "createdOn": 1669449310000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 221124A: Swift/BAT-GUANO detection",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 221124A"
}