//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33104 SUBJECT: GRB 221226A: Fermi GBM Final Real-time Localization DATE: 22/12/26 16:54:45 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 16:44:27 UT on 26 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221226A (trigger 693765872.056908 / 221226698). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 68.2, Dec = 34.8 (J2000 degrees, equivalent to J2000 04h 32m, 34d 47'), with a statistical uncertainty of 1.2 degrees. The angle from the Fermi LAT boresight is 97.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221226698/quicklook/glg_skymap_all_bn221226698.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/bn221226698/quicklook/glg_healpix_all_bn221226698.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221226698/quicklook/glg_lc_medres34_bn221226698.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33105 SUBJECT: Fermi GRB 221226A: Global MASTER-Net observations report DATE: 22/12/26 19:15:18 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 221226A ( Fermi GBM team, GCN 33104) errorbox 6665 sec after notice time and 6700 sec after trigger time at 2022-12-26 18:36:07 UT, with upper limit up to 18.0 mag. Observations started at twilight. The observations began at zenith distance = 76 deg. The sun altitude is -9.8 deg. The galactic latitude b = -8 deg., longitude l = 166 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2187618 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6730 | 2022-12-26 18:36:07 | MASTER-SAAO | (04h 44m 22.09s , +35d 17m 23.9s) | C | 60 | 15.0 | 6810 | 2022-12-26 18:37:27 | MASTER-SAAO | (04h 28m 26.64s , +33d 24m 58.1s) | C | 60 | 15.8 | 6980 | 2022-12-26 18:40:16 | MASTER-SAAO | (04h 25m 49.17s , +35d 17m 58.7s) | C | 60 | 16.1 | 7071 | 2022-12-26 18:41:48 | MASTER-SAAO | (04h 22m 22.24s , +37d 11m 21.9s) | C | 60 | 16.4 | 7162 | 2022-12-26 18:43:19 | MASTER-SAAO | (04h 32m 21.78s , +37d 12m 39.9s) | C | 60 | 16.6 | 7412 | 2022-12-26 18:47:29 | MASTER-SAAO | (04h 41m 26.03s , +37d 12m 15.3s) | C | 60 | 16.8 | 7583 | 2022-12-26 18:50:19 | MASTER-SAAO | (04h 38m 01.88s , +33d 23m 26.3s) | C | 60 | 17.2 | 7674 | 2022-12-26 18:51:51 | MASTER-SAAO | (04h 34m 37.01s , +35d 19m 08.3s) | C | 60 | 17.3 | 7764 | 2022-12-26 18:53:20 | MASTER-SAAO | (04h 44m 24.37s , +35d 17m 47.7s) | C | 60 | 17.2 | 7844 | 2022-12-26 18:54:40 | MASTER-SAAO | (04h 28m 29.31s , +33d 24m 59.4s) | C | 60 | 17.3 | 8014 | 2022-12-26 18:57:30 | MASTER-SAAO | (04h 25m 46.26s , +35d 19m 15.9s) | C | 60 | 17.4 | 8104 | 2022-12-26 18:59:01 | MASTER-SAAO | (04h 22m 25.82s , +37d 12m 14.8s) | C | 60 | 17.8 | 8195 | 2022-12-26 19:00:31 | MASTER-SAAO | (04h 32m 20.32s , +37d 11m 24.2s) | C | 60 | 17.7 | 8444 | 2022-12-26 19:04:41 | MASTER-SAAO | (04h 41m 26.27s , +37d 11m 56.5s) | C | 60 | 17.7 | 8615 | 2022-12-26 19:07:32 | MASTER-SAAO | (04h 37m 58.66s , +33d 24m 36.4s) | C | 60 | 18.0 | 8706 | 2022-12-26 19:09:02 | MASTER-SAAO | (04h 34m 35.73s , +35d 19m 35.3s) | C | 60 | 18.0 | 8785 | 2022-12-26 19:10:22 | MASTER-SAAO | (04h 44m 29.63s , +35d 18m 45.8s) | C | 60 | 18.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33106 SUBJECT: Swift GRB221226.95: Global MASTER-Net observations report DATE: 22/12/26 22:46:31 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB221226.95 (trigger No 1145959,01h 31m 40.08s , -41d 33m 14.4s, R=0.05) errorbox 21 sec after notice time and 42 sec after trigger time at 2022-12-26 22:42:02 UT, with upper limit up to 15.9 mag. The observations began at zenith distance = 58 deg. The sun altitude is -34.6 deg. The galactic latitude b = -73 deg., longitude l = 274 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2187664 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 47 | MASTER-SAAO | P/ | 10 | 15.9 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33113 SUBJECT: GRB 221226A: AGILE detection DATE: 22/12/27 13:57:53 GMT FROM: Alessandro Ursi at INAF/IAPS G. Panebianco (Univ. Bologna - INAF/OAS-Bologna), A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), A. Bulgarelli (INAF/OAS-Bologna), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Di Piano, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OASBologna, 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 satellite detected the GRB 221226A at T0 = 2022-12-26 16:44:27 s (UTC), reported by Fermi GBM (GCN #33104). The burst is visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 18 s and it released a total number of 26728 counts in the MCAL detector (above a background rate of 1222 Hz), and 68254 counts in the AC detector (above a background rate of 3101 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB221226A_AGILE_RM_ND.png . At the T0, the event was 78.3 deg off-axis. 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: 33121 SUBJECT: GRB 221226A: Swift/BAT-GUANO detection outside the coded FOV DATE: 22/12/29 01:11:32 GMT FROM: Aaron Tohuvavohu at U Toronto Gayathri Raman (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU) report: Swift/BAT did not localize GRB 221126A onboard (T0: 2022-12-26T16:44:27 UTC, Fermi/GBM GCN 33104). 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, arXiv:2111.01769), detects the burst with a sqrt(TS) of 25.4 in a 8.192 s analysis time bin. NITRATES results indicate a burst coming from outside the FOV, with DeltaLLHOut of -9. 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: 33123 SUBJECT: IPN triangulation of GRB 221226A DATE: 22/12/30 11:32:54 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 221226A (Fermi-GBM detection, the Fermi GBM team, GCN Circ. 33104; AGILE detection: Panebianco et al., GCN Circ. 33113; Swift/BAT-GUANO detection: Raman et al., GCN Circ. 33121) was detected by Fermi(GBM trigger 693765872), AGILE, Konus-Wind, and INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND) at about 60267 s UT (16:44:27). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 66.901 (04h 27m 36s) +36.975 (+36d 58' 30") Corners: 69.415 (04h 37m 40s) +37.331 (+37d 19' 50") 64.543 (04h 18m 10s) +37.133 (+37d 07' 58") 64.358 (04h 17m 26s) +36.223 (+36d 13' 23") 69.171 (04h 36m 41s) +36.500 (+36d 30' 00") --------------------------------------------- The error box area is 3.3 sq. deg, and its maximum dimension is 4.2 deg (the minimum one is 51 arcmin). The Sun distance was 150 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB221226_T60271/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33125 SUBJECT: GRB 221226A: Fermi GBM detection DATE: 22/12/30 16:17:59 GMT FROM: Peter Veres at UAH P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team: "At 16:44:27.06 UT on 26 December 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221226A (trigger 693765872 / 221226698) which was also detected by the AGILE (Panebianco et al., GCN 33113) and Swift/BAT (Raman et al., GCN 33121). The Fermi GBM Final Real-time Localization was reported in GCN 33104, and it is consistent with the IPN triangulation (Kozyrev et al., GCN 33123) The GBM light curve consists of two emission episodes with a duration (T90) of about 129 s (50-300 keV). The time-averaged spectrum from T0-3 s to T0+129 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.18 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 340 +/- 32 keV. The event fluence (10-1000 keV) in this time interval is (2.98 +/- 0.10)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.8 s in the 10-1000 keV band is 20.7 +/- 0.4 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 229 +/- 35 keV, alpha = -1.10 +/- 0.05 and beta = -1.90 +/- 0.08. 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/"