TITLE: GCN CIRCULAR NUMBER: 33298 SUBJECT: GRB 230207B: Swift/BAT-GUANO detection outside the coded FOV DATE: 23/02/07 17:30:03 GMT FROM: Aaron Tohuvavohu at U Toronto Gayathri Raman (PSU), Jamie A. Kennea (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto) report: Swift/BAT did not localize GRB 230207B onboard (T0: 2023-02-07T04:40:48 UTC, CALET trig 1359779945, INTEGRAL 10190, AGILE GCN 33296) The CALET and INTEGRAL notices, 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 BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 27.8 in a 8.192 s analysis time bin. The burst duration as seen by BAT is ~15 s. NITRATES results indicate a burst coming from outside the FOV, with DeltaLLHOut of -36. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. 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/