{
  "bibcode": "2020GCN.28583....1D",
  "body": "James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Jamie Kennea (PSU),\nPeter Veres (UAH) report:\n\nSwift/BAT did not trigger on GRB 201008A (T0: 2020-10-08 10:37:36 UTC,\nFermi/GBM Team TRIGGER 623846261).\n\nThe Fermi/GBM 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 Alert\nTelescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150]\nseconds around the time of the burst. All the requested event mode data was\ndelivered to the ground.\n\nThe burst is detected in BAT with a T90 duration of ~2.5 seconds.\n\nWith a maximum likelihood analysis (DeLaunay et al. 2020, in prep.) on\n\nthe event-mode data we detect a location for the burst with a square\n\nroot of the test statistic, sqrt(TS), of 13.22. The sqrt(TS) behaves\n\nsimilarly to SNR.\n\nUsing the normal BAT imaging technique, we find the location of the GRB\nwith an SNR of 4.2.\n\nSince this is a low significance detection near the edge of the coded field\nof view there is a chance that this localization may be incorrect.\n\nThe BAT ground-calculated position is\n\nRA, Dec = 161.744, 46.101 deg which is\n\n   RA(J2000)  = 10h 46m 58.56s\n\n   Dec(J2000) =  46d 06��� 03.6���\n\nwith an uncertainty of 5 arcmin, (radius, sys+stat, 90% containment).\n\nThe partial coding was 3.5%.\n\nThis position is consistent with the Fermi GBM localization (\nhttps://gcn.gsfc.nasa.gov/other/623846261.fermi) and BALROG localization\n(GCN 28577).\n\nXRT and UVOT follow-up has been triggered. Results of follow-up\nobservations will be reported in future circulars.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding\npipeline designed for targeted recovery of BAT event mode data around the\ntimes of compelling astrophysical events to enable more sensitive GRB\nsearches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found\nat: https://www.swift.psu.edu/guano/",
  "circularId": 28583,
  "createdOn": 1602196905000,
  "email": "jjd330@psu.edu",
  "subject": "GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization",
  "submitter": "James DeLaunay at PSU  <jjd330@psu.edu>",
  "eventId": "GRB 201008A"
}