James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Jamie A.
Kennea (PSU), Gayathri Raman (PSU), report:
Swift/BAT did not trigger on GRB 221206 (T0: 2022-12-06T12:22:47
UTC, Fermi/GBM GCN 33023).
The Fermi/GBM 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).
Upon 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.
The burst is detected in BAT with a duration of ~12 seconds.
The burst occurred during a Swift slew.
A candidate location for the burst was found with an SNR of 6.6.
The BAT position is
RA, Dec = 251.155, +42.671 deg which is
RA(J2000) = 16h 44m 37.13s
Dec(J2000) = +42d 40��� 17.0���
with an estimated uncertainty of 4 arcmin.
This position is consistent with the Ferm/GBM localization (GCN 33023).
XRT and UVOT follow-up has been requested. Results of follow-up
observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft
commanding pipeline designed for targeted recovery of BAT event mode
data around the times of compelling astrophysical events to enable
more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be
found at: https://www.swift.psu.edu/guano/