{
  "bibcode": "2022GCN.32823....1R",
  "body": "Gayathri Raman (PSU),  Aaron Tohuvavohu (U Toronto), James DeLaunay\n(UAlabama), Jamie A. Kennea (PSU), Tyler Parsotan (GSFC/UMBC) report:\n\nSwift/BAT did not localize GRB 221022B onboard (T0:\n2022-10-22T22:55:48 UTC, Fermi/GBM GCN 32820, AGILE GCN 32822).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift\nMission Operations Center operated Gamma-ray Urgent Archiver for Novel\nOpportunities (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 200 seconds of BAT event-mode data from\n[-50,+150] 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 44.9 in a\n16.384 s analysis time bin.\n\nNITRATES results are consistent with a burst coming from outside the\nFOV, with DeltaLLHOut of -17. The best fit sky location is consistent\nwith the Fermi/GBM position (GCN 32820).\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": 32823,
  "createdOn": 1666570920000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 221022B"
}