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This page lists all entries on GRB231004A in GRBweb

Summary Fermi GBM GCN 34795 GCN 34804 GCN 34812 GCN 34868

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB231004350
T0	8:23:34.980 UTC	Fermi_GBM
ra	68.3500°	Fermi_GBM
decl	-9.9500°	Fermi_GBM
pos_error	3.61e+00°	Fermi_GBM
T90	6.08 s	Fermi_GBM
T90_error	0.516 s	Fermi_GBM
T90_start	8:23:34.980 UTC	Fermi_GBM
fluence	2.80e-06 erg/cm²	Fermi_GBM
fluence_error	3.86e-08 erg/cm²	Fermi_GBM
T100	6.08 s
GBM_located	True
mjd	60221.34971041667	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB231004350
trigger_name	bn231004350
ra	68.3500°
decl	-9.9500°
pos_error	3.61e+00°
datum	2023-10-04
t_trigger	8:23:35.108 UTC
T90	6.08 s
T90_error	0.516 s
T90_start	8:23:34.980 UTC
fluence	2.80e-06 erg/cm²
fluence_error	3.86e-08 erg/cm²
flux_1024	6.25e+00 erg/cm²/s
flux_1024_error	3.00e-01 erg/cm²/s
flux_1024_time	7.04e-01 erg/cm²/s
flux_64	1.02e+01 erg/cm²/s
flux_64_error	1.38e+00 erg/cm²/s

GCN 34795 table
GRB_name	GRB231004A
GCN_number	34795
Detection_method	Fermi GBM final loc
t_trigger	8:23:35 UTC
ra	68.3000°
decl	-9.9000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34795 SUBJECT: GRB 231004A: Fermi GBM Final Real-time Localization DATE: 23/10/04 08:33:54 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 08:23:35 UT on 4 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231004A (trigger 718100620.108376 / 231004350). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 68.3, Dec = -9.9 (J2000 degrees, equivalent to J2000 04h 33m, -9d 54'), with a statistical uncertainty of 3.4 degrees. The angle from the Fermi LAT boresight is 94.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231004350/quicklook/glg_skymap_all_bn231004350.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/bn231004350/quicklook/glg_healpix_all_bn231004350.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231004350/quicklook/glg_lc_medres34_bn231004350.gif

GCN 34804 table
GRB_name	GRB231004A
GCN_number	34804
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34804 SUBJECT: GRB 231004A: CALET Gamma-Ray Burst Monitor detection DATE: 23/10/05 18:15:41 GMT FROM: Yuta Kawakubo at Louisiana State University S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 231004A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 34795) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 08:23:32.70 UTC on 4 October 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1380443018/). The burst signal was seen by only the SGM detector. The burst light curve shows a multi-peaked structure that starts at T+2.1 sec, peaks at T+2.9 sec, and ends at T+4.1 sec. The T90 and T50 durations measured by the SGM data are 1.7 +/- 0.2 sec and 1.1 +/- 0.3 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1380443018/index.html The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.

GCN 34812 table
GRB_name	GRB231004A
GCN_number	34812
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34812 SUBJECT: GRB 231004A: Glowbug gamma-ray detection DATE: 23/10/11 19:55:47 GMT FROM: C.C. Cheung at Naval Research Lab M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 231004A, which was also detected by Fermi/GBM and CALET (GCN 34795, 34804). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-10-04 08:23:33.360 with a duration of 4.1 s and a total significance of about 29.0 sigma. The light curve comprises a single broad peak. Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.3 and a cutoff energy ("Epeak") of 298 keV. The modeled 10-10000 keV fluence is 2.2e-06 erg/cm^2. The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006 Distribution Statement A: Approved for public release. Distribution is unlimited.

GCN 34868 table
GRB_name	GRB231004A
GCN_number	34868
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34868 SUBJECT: GRID detection of GRB 231004A DATE: 23/10/21 13:16:40 GMT FROM: GRID Student Team at Tsinghua University Chenyu Wang and Zirui Yang report on behalf of the GRID Collaboration: The long-duration GRB 231004A (Fermi/GBM detection: GCN Circular 34795, IceCube detection: GCN Circular 34797, CALET detection: GCN Circular 34804, Glowbug detecton: GCN Circular 34812) was also detected with three GRID detectors, GRID-03B, GRID-04, and GRID-07, onboard two different CubeSats. The event was triggered by GRID on 2023-10-04 at 08:23:35.0 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 6.1 +/- 1.0 seconds. GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.