//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32164 SUBJECT: GRB 220606A: Fermi GBM Final Real-time Localization DATE: 22/06/06 00:46:11 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 00:35:39 UT on 6 Jun 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220606A (trigger 676168544.281518 / 220606025). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 258.2, Dec = -26.0 (J2000 degrees, equivalent to J2000 17h 12m, -26d 00'), with a statistical uncertainty of 15.6 degrees. The angle from the Fermi LAT boresight is 94.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606025/quicklook/glg_skymap_all_bn220606025.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606025/quicklook/glg_healpix_all_bn220606025.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606025/quicklook/glg_lc_medres34_bn220606025.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32171 SUBJECT: GRB 220606A: Swift/BAT-GUANO detection DATE: 22/06/06 16:57:44 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 220606A onboard (T0: 2022-02-03T21:15:39.8 UTC, Fermi/GBM GCN 32164). The 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). Upon trigger, 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, arXiv:2111.01769), detects the burst with a sqrt(TS) of 9.8 in a 4.096 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 5.7 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: 32181 SUBJECT: GRB 220606A: Fermi GBM observation DATE: 22/06/08 14:32:53 GMT FROM: Boyan A. Hristov at UAH B. Hristov (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 00:35:39.28 UT on 06 June 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220606A (trigger 676168544 / 220606025, GCN 32164), which was also detected by the Swift/BAT-GUANO (A. Tohuvavohu et al. 2022, GCN 32171). The GBM light curve consists of multiple peaks with a duration (T90) of about 19.7 +/- 1.6 s (50-300 keV). The time-averaged spectrum from T0-2.560 s to T0+17.664 s is well fit by a simple power law with index = -1.37 +/- 0.03. The event fluence (10-1000 keV) in this time interval is (2.88 +/- 0.17)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.64 s in the 10-1000 keV band is 1.6 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"