{
  "bibcode": "2021GCN.31049....1T",
  "body": "Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay\n(UAlabama), Jamie A. Kennea (PSU), report:\n\nSwift/BAT did not trigger on GRB 211106A (T0: 2021-11-06T04:37:31.2\nUTC, INTEGRAL/SPI-ACS #9504).\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), confidently detects the burst in a 0.512 s analysis\ntime bin with a sqrt(TS) of 19.1.\nEstimated T90 in the detector is 1.75 +/- 0.05 s (15-350 keV).\n\nA candidate localization is found with DeltaLLHOut of 7.2 and a\nDeltaLLHPeak of 6.7.\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.\nConventional imaging does not find a location for this burst.\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 = 343.643 -53.236 deg which is\n   RA(J2000)  = 22h 54m 34.32s\n   Dec(J2000) =  -53d 14��� 0.9���\nwith an estimated uncertainty of 7 arcmin.\nThe partial coding fraction at this position is 3.9%.\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": 31049,
  "createdOn": 1636210294000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 211106A"
}