{
  "bibcode": "2021GCN.30732....1D",
  "body": "James DeLaunay (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU),\nAaron Tohuvavohu (U Toronto),  report:\n\nSwift/BAT did not trigger on GRB 210827A (T0: 2021-08-27 09:59:24.34\nUTC, Fermi/GBM trigger #  651751169, GCN 30724).\n\nThe Fermi/GBM 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 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 burst is detected in BAT with a duration of approximately 10 seconds.\nUsing the normal BAT imaging technique, we find the location for\nthe GRB with an SNR of 8.3.\n\nThe BAT position is\nRA, Dec = 174.9181 +55.7858 deg which is\n   RA(J2000)  = 11h 39m 40.34s\n   Dec(J2000) =  +55d 47��� 08.88���\nwith an estimated uncertainty of 4 arcmin.\n\nThis position is consistent with the Fermi/GBM localization.\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": 30732,
  "createdOn": 1630100518000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 210827A: Swift/BAT-GUANO detection and arcminute localization",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 210827A"
}