//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32198 SUBJECT: GRB 220612A: Swift/BAT-GUANO detection DATE: 22/06/14 21:29:24 GMT FROM: Aaron Tohuvavohu at U Toronto James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), report: Swift/BAT did not localize GRB 220612A onboard (T0: 2022-06-12T06:55:22.45 UTC, CALET trig #1339051922). The CALET 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, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-45,+45] 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, arXiv:2111.01769), detects the burst with a sqrt(TS) of 9.3 in a 16.384 s analysis time bin. NITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT FOV, with a borderline DeltaLLHOut of 7.1 and no specific location in the FOV preferred. Independent spectral and/or fluence measurements of this burst from other instruments could help determine the preferred spatial origin. See Section 9.1 and Figure 20 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/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32199 SUBJECT: GRB 220612A: CALET Gamma-Ray Burst Monitor detection DATE: 22/06/15 05:11:25 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET S. Torii (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 220612A (Swift/BAT-GUANO detection: DeLaunay et al., GCN Circ. 32198) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 06:55:22.451 UTC on 12 June 2022 (http://cgbm.calet.jp/cgbm_trigger/flight/1339051922/index.html). The burst signal was faintly seen by only the SGM detector. The light curve of the SGM shows two weak pulses. The emission starts at T+2.8 sec, peaks at T+6.2 sec, and ends at T+19.7 sec. The T90 and T50 durations measured by the SGM data are 15.0 +/- 1.0 sec and 8.0 +/- 1.4 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1339051922/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.