{
  "bibcode": "2022GCN.31716....1T",
  "body": "Aaron Tohuvavohu (U Toronto), James DeLaunay (UAlabama), Gayathri\nRaman (PSU), Jamie A. Kennea (PSU), report:\n\nSwift/BAT did not localize GRB 220308A onboard (T0: 2022-03-08T05:43:08\n UTC, INTEGRAL/SPI-ACS trig#9761, IPN GCN 31715).\n\nThe INTEGRAL notice, distributed in near real-time, triggered the\nSwift Mission Operations Center operated Gamma-ray Urgent Archiver for\nNovel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst\nAlert Telescope (BAT) to save 90 seconds of BAT event-mode data from\n[-45,+45] seconds around the time of the burst. All the requested\nevent mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu,\narXiv:2111.01769), detects the burst with a sqrt(TS) of 97 in a 8.192\ns analysis time bin.\nThe duration of this burst episode is ~10s.\n\nNITRATES results indicate a burst coming from outside the coded FOV,\nwith DeltaLLHOut of -240. An out of FOV origin is consistent with the\nIPN timing localization (GCN 31715).\n\nSee Section 9.1 and Figure 20 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": 31716,
  "createdOn": 1646793044000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 220308A"
}