{
  "bibcode": "2022GCN.32167....1T",
  "body": "Aaron Tohuvavohu (U Toronto), James DeLaunay (UAlabama), Gayathri\nRaman (PSU), Jamie A. Kennea (PSU), report:\n\nSwift/BAT did not localize GRB 220606B onboard (T0:\n2022-06-06T01:03:28 UTC, Fermi/GBM GCN 32165).\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 in a 0.512 s analysis time bin\nwith a sqrt(TS) of 10.7.\nThe duration of the burst as seen by BAT is less than 0.5 s.\n\nA candidate arcminute localization is found with DeltaLLHOut of 11.3\nand a DeltaLLHPeak of 3.1.\nFor this reason we can confidently claim detection, and preference for\nan in FOV origin, but the best fit arcmin localization is not strongly\npreferred over other positions.\n\nSee Section 9.1 and Figure 20 in the NITRATES paper for brief\ndescriptions and interpretations of sqrt(TS), DeltaLLHPeak, and\nDeltaLLHOut.\n\nThe BAT position is\nRA, Dec = 28.474, -54.471 deg which is\n   RA(J2000)  = 01h 53m 53.76s\n   Dec(J2000) = -54d 28��� 15.6���\nwith an estimated uncertainty of 5 arcmin.\n\nThis position is consistent with the Fermi/GBM localization (GCN 32165).\n\nXRT and UVOT follow-up has been requested.\nResults of follow-up observations will be reported in future circulars.\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": 32167,
  "createdOn": 1654518216000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 220606B"
}