//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33031 SUBJECT: GRB 221209A: Fermi GBM Final Real-time Localization DATE: 22/12/09 06:00:47 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 05:50:24 UT on 9 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221209A (trigger 692257829.852778 / 221209243). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 241.7, Dec = 48.1 (J2000 degrees, equivalent to J2000 16h 06m, 48d 06'), with a statistical uncertainty of 1.0 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/bn221209243/quicklook/glg_skymap_all_bn221209243.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/bn221209243/quicklook/glg_healpix_all_bn221209243.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221209243/quicklook/glg_lc_medres34_bn221209243.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33032 SUBJECT: GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243) DATE: 22/12/09 07:02:34 GMT FROM: Jochen Greiner at MPE,Garching F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 692257829 at 05:50:24 on 09 Dec. 2022 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 234.9+/-0.9 deg Decl.(2000.0) = 48.7+/-0.6 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB221209243/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB221209243/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB221209243/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33034 SUBJECT: GRB 221209A: Fermi GBM observation DATE: 22/12/09 15:04:36 GMT FROM: Elisabetta Bissaldi at INFN,Bari E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team: "At 05:50:24.85 UT on 9 December 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221209A (trigger 692257829 / 221209243). The Fermi GBM Final Real-time Localization is reported in GCN 33031. The angle from the Fermi LAT boresight at the GBM trigger time is 97 degrees. The GBM light curve consists of a single bright emission episode with a duration (T90) of about 4 s (50-300 keV). The time-averaged spectrum from T0 to T0+7 s is best fit by a Band function with Epeak = 325 +/- 12 keV, alpha = -0.62 +/- 0.02, and beta = -2.08 +/- 0.03. The event fluence (10-1000 keV) in this time interval is (3.35 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.2 in the 10-1000 keV band is 67.1 +/- 0.6 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/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33037 SUBJECT: GRB 221209A: AstroSat CZTI detection DATE: 22/12/10 02:55:52 GMT FROM: Gaurav Waratkar at IIT,Bombay R. Gopalakrishnan (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the ML pipeline (Abraham et al., 2021, MNRAS, 504, 3084) and the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright GRB 221209A which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 33031) and BALROG (Kunzweiler et al., GCN Circ. 33032). The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2022-12-09 05:50:26.45 UTC. The measured peak count rate associated with the burst is 6052 (+437, -209) counts/s above the background in the combined data of all quadrants, with a total of 9174 (+346, -285) counts. The local mean background count rate was 445 (+8, -10) counts/s. Using cumulative rates, we measure a T90 of 2.7 (+0.2, -0.1) s. In the preliminary analysis, we find 1078 Compton events associated with this event. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2022-12-09 05:50:26.18 UTC. The measured peak count rate is 5980 (+136, -150) counts/s above the background in the combined Veto data of all quadrants, with a total of 12635 (+713, -729) counts. The local mean background count rate was 1402 (+8, -7) counts/s. We measure a T90 of 3.5 (+1.0, -0.6) s from the cumulative Veto light curve. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33049 SUBJECT: GRB 221209A: CALET Gamma-Ray Burst Monitor detection DATE: 22/12/12 23:03:08 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, 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 221209A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 33031; BALROG localization: Kunzweiler et al., GCN Circ 33032; Fermi GBM observation: Bissaldi et al., GCN Circ 33034; AstroSat CZTI detection: Gopalakrishnan et al., GCN Circ 33037) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 05:50:25.591 UTC on 9 December 2022 (http://cgbm.calet.jp/cgbm_trigger/flight/1354600238/index.html). The burst signal was seen by all CGBM detectors. No real-time CGBM GCN notice was distributed about this trigger because the real-time communication from the ISS was off (loss of signal). The burst light curve shows a single pulse that starts at T-2.0 sec, peaks at T+0.9 sec, and ends at T+5.0 sec. The T90 and T50 durations measured by the SGM data are 3.2 +/- 0.4 sec and 1.3 +/- 0.1 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1354600238/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33059 SUBJECT: IPN triangulation of GRB 221209A (long) DATE: 22/12/15 16:29:48 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, 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 bright, long-duration GRB 221209A (Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33031; Bissaldi, GCN Circ. et al., GCN Circ. 33034; BALROG localization: Kunzweiler et al., GCN Circ. 33032; AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ. 33037; CALET-CGBM detection: Kawakubo et al., GCN Circ. 33049) was detected by Fermi(GBM trigger 692257829), Konus-Wind, INTEGRAL (SPI-ACS), AstroSat (CZTI), CALET (CGBM), and Mars-Odyssey (HEND) at about 21024 s UT (05:50:24). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 231.643 (15h 26m 34s) +49.850 (+49d 50' 59") Corners: 230.092 (15h 20m 22s) +49.310 (+49d 18' 36") 230.747 (15h 22m 59s) +49.761 (+49d 45' 38") 233.222 (15h 32m 53s) +50.361 (+50d 21' 41") 232.541 (15h 30m 10s) +49.930 (+49d 55' 48") --------------------------------------------- The error box area is 1573 sq. arcmin, and its maximum dimension is 2.28 deg (the minimum one is 15.5 arcmin). The Sun distance was 76 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final localization (GCN 33034) and the BALROG localization (33032). A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB221209_T21024/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33061 SUBJECT: Konus-Wind detection of GRB 221209A DATE: 22/12/15 16:36:16 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 221209A (Fermi-GBM observation: Bissaldi, GCN 33034; AstroSat CZTI detection: Gopalakrishnan et al., GCN Circ 33037; IPN triangulation: Kozyrev et al., GCN 33059) triggered Konus-Wind (KW) at T0=21024.993 s UT (05:50:24.993). The burst light curve shows a bright, FRED-like pulse, which starts at ~T0-0.5 s, peaks at ~T0-0.640 s, and has a total duration of ~10 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB221209_T21024/ As observed by Konus-Wind, the burst had a fluence of (6.39 ± 0.43)x10^-5 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 0.640 s, of (4.89 ± 0.28)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+12.302 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.64 (-0.09,+0.10), the high energy photon index beta = -2.05 (-0.08,+0.07), the peak energy Ep = 306 (-32,+36) keV, chi2 = 103/97 dof. The spectrum near the peak count rate (measured from T0+0.256 to T0+1.280 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.28 (-0.11,+0.12), the high energy photon index beta = -1.97 (-0.07,+0.06), the peak energy Ep = 366 (-39,+46) keV, chi2 = 68/66 dof. All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.