{
  "createdOn": 1682100857460,
  "body": "James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Samuele Ronchini (PSU), Tyler Parsotan (UMBC/GSFC) report:\n\nSwift/BAT did not localize GRB 230431A onboard (T0: 2023-04-21 09:42:46.370000UTC, Fermi/GBM GCN 33668).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe burst occured during a Swift slew. \nSlew mosaic imaging finds the position of the burst with SNR of 10.5.\n\nThe BAT position is\nRA, Dec = 41.704, +1.119 deg which is\n   RA(J2000)  = 02h 46m 48.96s\n   Dec(J2000) = +01d 07′ 08.4″\nwith an estimated uncertainty of 5 arcmin radius.\n\nThe burst location is Sun constrained for Swift, so there will be no XRT or UVOT followup.\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/\n",
  "circularId": 33672,
  "subject": "GRB 230421: Swift/BAT-GUANO arcminute localization",
  "bibcode": "2023GCN.33672....1D",
  "eventId": "GRB 230421",
  "submitter": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>"
}