//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33215 SUBJECT: GRB 230124A: Fermi GBM Final Real-time Localization DATE: 23/01/24 15:28:54 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 15:18:46 UT on 24 Jan 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230124A (trigger 696266331.698466 / 230124638). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 67.2, Dec = -1.4 (J2000 degrees, equivalent to J2000 04h 28m, -1d 23'), with a statistical uncertainty of 3.3 degrees. The angle from the Fermi LAT boresight is 32.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230124638/quicklook/glg_skymap_all_bn230124638.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/bn230124638/quicklook/glg_healpix_all_bn230124638.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230124638/quicklook/glg_lc_medres34_bn230124638.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33216 SUBJECT: Fermi GRB 230124A: Global MASTER-Net observations report DATE: 23/01/24 15:45:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 230124A ( Fermi GBM team, GCN 33215) errorbox 521 sec after notice time and 554 sec after trigger time at 2023-01-24 15:28:00 UT, with upper limit up to 19.0 mag. Observations started at twilight. The observations began at zenith distance = 51 deg. The sun altitude is -13.9 deg. The galactic latitude b = -31 deg., longitude l = 197 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2194256 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 609 | 2023-01-24 15:28:00 | MASTER-Kislovodsk | (04h 24m 10.16s , -01d 16m 01.3s) | C | 110 | 18.1 | 754 | 2023-01-24 15:28:00 | MASTER-Kislovodsk | (04h 24m 10.17s , -01d 16m 01.3s) | C | 400 | 19.0 | Coadd 749 | 2023-01-24 15:30:10 | MASTER-Kislovodsk | (04h 24m 10.23s , -01d 17m 43.1s) | C | 130 | 18.3 | 913 | 2023-01-24 15:32:39 | MASTER-Kislovodsk | (04h 24m 12.35s , -01d 15m 53.2s) | C | 160 | 18.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33220 SUBJECT: GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV DATE: 23/01/25 02:49:23 GMT FROM: Aaron Tohuvavohu at U Toronto Jamie A. Kennea (PSU), Gayathri Raman (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto) report: Swift/BAT did not localize GRB 230124A onboard (T0: 2023-01-24T15:18:46 UTC, Fermi/GBM GCN 33215). 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 9.5 in a 4.096 s analysis time bin. NITRATES results are consistent with a burst coming from outside the FOV, as suggested by the Fermi/GBM localization. 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: 33222 SUBJECT: GRB 230124A: Fermi GBM Observation DATE: 23/01/26 01:00:42 GMT FROM: Sarah Dalessi at UAH S. Dalessi (UAH) and C.Meegan (UAH) report on behalf of the Fermi GBM Team: "At 15:18:46.70 UT on 24 January 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 230124A (trigger 696266331 / 230124638) which was also detected by the Swift/BAT-GUANO (J. A. Kennea et al. 2023, GCN 33220). The Fermi GBM Final Real-time Localization was reported in GCN 33215. The angle from the Fermi LAT boresight at the GBM trigger time is 32 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 12 s (50-300 keV). The time-averaged spectrum from T0-2.56 s to T0+12.8 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.36 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 77.41 +/- 3.34 keV. The event fluence (10-1000 keV) in this time interval is (2.248 +/- 0.077)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.1 s in the 10-1000 keV band is 4.6 +/- 0.3 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/"