{
  "bibcode": "2022GCN.32941....1D",
  "body": "James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Gayathri\nRaman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (GSFC/UMBC) report:\n\nSwift/BAT did not localize GRB 221115B onboard (T0:\n2022-11-15T09:46:15 UTC, CALET trig 1352540756).\n\nThe CALET 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 in a 2.048 s analysis time bin\nwith a sqrt(TS) of 27.7.\nThe duration of the burst as seen by BAT is ~5 seconds.\n\nA confident arcminute localization is found with DeltaLLHPeak of 49.\n\nSee Section 9.1 and Figure 17 in the NITRATES paper for brief\ndescriptions and interpretations of sqrt(TS), DeltaLLHPeak, and\nDeltaLLHOut.\n\nThe BAT position is\nRA, Dec = 54.788, -16.701 deg which is\n   RA(J2000)  = 03h 39m 09.16s\n   Dec(J2000) = -16d 42��� 03.5���\nwith an estimated uncertainty of 3 arcmin.\n\nXRT and UVOT follow-up has been requested, but will be significantly\ndelayed due to operational constraints.\nWe encourage followup from other facilities.\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": 32941,
  "createdOn": 1668555637000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 221115B: Swift/BAT-GUANO arcminute localization",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 221115B"
}