GRB230911B

This page lists all entries on GRB230911B in GRBweb

Summary Fermi GBM GCN 34653 GCN 34654 GCN 34660 GCN 34664 GCN 34677

Summary table
Variable Value Source
GRB_name_Fermi GRB230911185
T0 4:25:48.497 UTC Fermi_GBM
ra 351.7100° Fermi_GBM
decl -55.0100° Fermi_GBM
pos_error 2.25e+00° Fermi_GBM
T90 85.505 s Fermi_GBM
T90_error 0.724 s Fermi_GBM
T90_start 4:25:48.497 UTC Fermi_GBM
fluence 1.72e-05 erg/cm² Fermi_GBM
fluence_error 4.04e-08 erg/cm² Fermi_GBM
T100 85.505 s
GBM_located True
mjd 60198.18458908565 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB230911185
trigger_name bn230911185
ra 351.7100°
decl -55.0100°
pos_error 2.25e+00°
datum 2023-09-11
t_trigger 4:25:49.521 UTC
T90 85.505 s
T90_error 0.724 s
T90_start 4:25:48.497 UTC
fluence 1.72e-05 erg/cm²
fluence_error 4.04e-08 erg/cm²
flux_1024 1.36e+01 erg/cm²/s
flux_1024_error 5.72e-01 erg/cm²/s
flux_1024_time 1.92e+00 erg/cm²/s
flux_64 1.97e+01 erg/cm²/s
flux_64_error 2.67e+00 erg/cm²/s
GCN 34653 table
GRB_name GRB230911B
GCN_number 34653
Detection_method Fermi GBM final loc
t_trigger 4:25:49 UTC
ra 351.7000°
decl -55.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34653 SUBJECT: GRB 230911B: Fermi GBM Final Real-time Localization DATE: 23/09/11 04:37:15 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:25:49 UT on 11 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230911B (trigger 716099154.520658 / 230911185). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 351.7, Dec = -55.0 (J2000 degrees, equivalent to J2000 23h 26m, -55d 00'), with a statistical uncertainty of 1.1 degrees. The angle from the Fermi LAT boresight is 131.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230911185/quicklook/glg_skymap_all_bn230911185.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/bn230911185/quicklook/glg_healpix_all_bn230911185.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230911185/quicklook/glg_lc_medres34_bn230911185.gif
GCN 34654 table
GRB_name GRB230911B
GCN_number 34654
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34654 SUBJECT: Fermi GRB 230911B: Global MASTER-Net observations report DATE: 23/09/11 05:45:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (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), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 230911B ( Fermi GBM team, GCN 34653) errorbox 928 sec after notice time and 961 sec after trigger time at 2023-09-11 04:41:51 UT, with upper limit up to 13.2 mag. The observations began at zenith distance = 24 deg. The sun altitude is -63.7 deg. The galactic latitude b = -59 deg., longitude l = 326 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2268866 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1052 | 2023-09-11 04:41:51 | MASTER-OAFA | (23h 25m 02.98s , -55d 03m 29.7s) | C | 180 | 12.1 | 1579 | 2023-09-11 04:50:38 | MASTER-OAFA | (23h 24m 58.92s , -55d 02m 04.7s) | C | 180 | 13.2 | 2059 | 2023-09-11 04:58:39 | MASTER-OAFA | (23h 25m 30.11s , -55d 04m 12.8s) | C | 180 | 13.1 | 2630 | 2023-09-11 05:08:09 | MASTER-OAFA | (23h 25m 03.23s , -55d 03m 59.3s) | C | 180 | 12.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 34660 table
GRB_name GRB230911B
GCN_number 34660
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 34660 SUBJECT: GRB 230911B: correction to the KW GCN 34659 DATE: 23/09/11 16:08:48 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, on behalf of the KW team, the subject line of GCN 34659 contains a typo in the GRB name and should read as "Konus-Wind detection of GRB 230911D" We are sorry for the inconvenience.
GCN 34664 table
GRB_name GRB230911B
GCN_number 34664
Detection_method INTEGRAL
Circular_text TITLE: GCN CIRCULAR NUMBER: 34664 SUBJECT: GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection DATE: 23/09/11 20:36:40 GMT FROM: Marianna Dafčíková 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.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Poon, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (U. Tokyo), K. Torigoe, Y. Uchida (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), T. Bozoki, G. Dalya, G. Friss, K. Kapas, J. Takatsy (Eotvos U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha and VZLUSAT-2/GRB payload collaborations We report a joint detection of a long-duration GRB 230911B by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048) and the GRB detector on board of VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/). The event was also observed by Fermi/GBM (GCN 34653) and INTEGRAL/SPI-ACS at ~2023-09-11 04:25:51 UT. The GRBAlpha detection was confirmed at the peak time 2023-09-11 04:25:51 UTC. The T90 duration is 15 s and the significance during T90 reaches 13 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230911B_GCN.pdf The VZLUSAT-2 detection was confirmed at the peak time 2023-09-11 04:25:50 UTC. The data acquisition was performed by the GRB detector unit no. 1. The T90 duration is 15 s and the significance during T90 reaches 9 sigma. The light curves obtained by VZLUSAT-2 are available here: https://vzlusat2.konkoly.hu/static/share/GRB230911B_GCN_VZLUSAT2.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat 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. 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. All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/ The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.
GCN 34677 table
GRB_name GRB230911B
GCN_number 34677
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 34677 SUBJECT: GRB 230911B: AstroSat CZTI detection DATE: 23/09/12 13:29:01 GMT FROM: Gaurav Waratkar at IIT Bombay P. K. Navaneeth (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 CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of the long-duration GRB 230911B which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 34653) along with GRBAlpha and VZLUSAT-2 (Dafcikova et al., GCN Circ. 34664). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-09-11 04:25:51.50 UTC. The measured peak count rate associated with the burst is 467 (+56, -35) counts/s above the background in the combined data of all quadrants, with a total of 3390 (+378, -416) counts. The local mean background count rate was 593 (+4, -4) counts/s. Using cumulative rates, we measure a T90 of 15 (+5, -3) s. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-09-11 04:25:51.83 UTC. The measured peak count rate associated with the burst is 790 (+75, -76) counts/s above the background in the combined data of all quadrants, with a total of 4781 (+532, -605) counts. The local mean background count rate was 1400 (+6, -7) counts/s. We measure a T90 of 14 (+7, -3) s from the cumulative Veto light curve. 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. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb