GRB 220511A: Swift/BAT-GUANO arcminute localization

Swift/BAT did not trigger on GRB 220511A (T0: 2022-05-11T13:47:57 UTC, Fermi/GBM GCN 32018, INTEGRAL/SPI-ACS trig#9912, GECAM trig # utn220511_134156_GECAMb, AGILE GCN 32021). The GECAM 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 burst is detected in BAT with a duration of ~5 seconds. The burst occurred during a Swift slew. The burst location was found in a mosaiced slew image with an SNR of ~10. The BAT position is RA, Dec = 287.446, 17.739 deg which is RA(J2000) = 19h 09m 47.04s Dec(J2000) = 17d 44' 20.4″ with an estimated uncertainty of 7 arcmin. This position is consistent with the Ferm/GBM localization (GCN 32018). 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 b found at: https://www.swift.psu.edu/guano/