//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33137 SUBJECT: GRB 230102A: Fermi GBM Final Real-time Localization DATE: 23/01/02 00:32:32 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 00:22:12 UT on 2 Jan 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230102A (trigger 694311737.966744 / 230102015). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 272.8, Dec = -35.1 (J2000 degrees, equivalent to J2000 18h 11m, -35d 06'), with a statistical uncertainty of 4.0 degrees. The angle from the Fermi LAT boresight is 65.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230102015/quicklook/glg_skymap_all_bn230102015.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230102015/quicklook/glg_healpix_all_bn230102015.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230102015/quicklook/glg_lc_medres34_bn230102015.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33138 SUBJECT: GRB 230102A: AGILE/MCAL detection DATE: 23/01/02 11:07:23 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), F. Longo (Univ. Trieste and INFN Trieste), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE Mini-CALorimeter (MCAL) detected the GRB 230102A at T0 = 2023-01-02 00:22:12.97 +/- 0.01 s (UTC), reported by Fermi GBM (GCN #33137). The event lasted about 0.16 s and released a total number of 219 counts in the MCAL detector (in the 0.4-100 MeV energy range), above an average background rate of 489 Hz. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/GRB230102A_081632_599703732.970000.png . The time-integrated spectrum of the burst, from T0-0.032 s to T0+0.128 s, can be fitted in the energy range 0.4-2 MeV with a power-law with ph.ind. = -2.48 (-0.46,+0.51), resulting in a reduced chi-squared of 0.85 (21 d.o.f.) and a fluence of 1.07e-06 erg/cm^2 (90% confidence level), in the same energy range. At the T0, the event was 100 deg off-axis. The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33143 SUBJECT: GRB 230102A: Detection by GRBAlpha DATE: 23/01/03 16:43:28 GMT FROM: Marianna Dafcikova at Masaryk University <500025@mail.muni.cz> M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Os aka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The short-duration GRB 230102A (Fermi/GBM detection: GCN Circ. 33137; AGILE/MCAL detection: GCN Circ. 33138) was observed by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020). The detection was confirmed at the peak time 2023-01-02 00:22:13 UTC. The light curve observed by GRBAlpha shows a spike within one 1 s bin. The SNR reaches 5.6. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230102A_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha is a demonstration mission for a future CubeSats constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22 from Baikonur. After its commissioning phase, the scientific observations are now under way. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33147 SUBJECT: GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV DATE: 23/01/04 05:32:28 GMT FROM: Aaron Tohuvavohu at U Toronto James DeLaunay (UAlabama), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU) report: Swift/BAT did not localize GRB 230102A onboard (T0: 2022-12-26T00:22:12 UTC, Fermi/GBM GCN 33137, AGILE GCN 33138, GRBAlpha GCN 33143). 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 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 29.2 in a 0.128 s analysis time bin. NITRATES results indicate a burst coming from outside the coded FOV, with DeltaLLHOut of -6. 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/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33151 SUBJECT: GRB 230102A: Fermi GBM Observation DATE: 23/01/05 18:21:17 GMT FROM: Cori Fletcher at USRA C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 00:22:13 UT on 02 January 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230102A (trigger 694311737/230102015). which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2023, GCN 33147), GRBAlpha (M. Dafcikova et al 2023, GCN 33143) and AGILE (A. Ursi et al. 2023, GCN 33138). The Fermi GBM Localization was reported in GCN 33137. The angle from the Fermi LAT boresight is 65 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 0.18 s (50-300 keV). The time-averaged spectrum from T0-0.06 to T0+0.19 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.94 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 1508 +/- 260 keV. The event fluence (10-1000 keV) in this time interval is (1.43 +/- 0.05)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0 s in the 10-1000 keV band is 36 +/- 1 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/" FSSC: Data » Data Access » GBM - Fermi Gamma-ray Space Telescope ID Name Description; GS-106: GBM Burst Catalog Entry: Parameters describing the burst (e.g., durations, fluences). This file is used to create GBM Burst Catalog.: GS-109 fermi.gsfc.nasa.gov