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This page lists all entries on GRB210925A in GRBweb

Summary Fermi GBM GCN 30880 GCN 30881

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB210925800
T0	19:12:27 UTC	GCN_circulars,Fermi GBM final loc
ra	347.4300°	Fermi_GBM
decl	-17.1400°	Fermi_GBM
pos_error	3.65e+00°	Fermi_GBM
T90	229.124 s	Fermi_GBM
T90_error	1.557 s	Fermi_GBM
T90_start	19:12:32.829 UTC	Fermi_GBM
fluence	1.85e-05 erg/cm²	Fermi_GBM
fluence_error	5.79e-08 erg/cm²	Fermi_GBM
T100	234.953 s
GBM_located	True
mjd	59482.8003125	GCN_circulars,Fermi GBM final loc

Fermi GBM table
GRB_name_Fermi	GRB210925800
trigger_name	bn210925800
ra	347.4300°
decl	-17.1400°
pos_error	3.65e+00°
datum	2021-09-25
t_trigger	19:12:27.965 UTC
T90	229.124 s
T90_error	1.557 s
T90_start	19:12:32.829 UTC
fluence	1.85e-05 erg/cm²
fluence_error	5.79e-08 erg/cm²
flux_1024	5.94e+00 erg/cm²/s
flux_1024_error	2.77e-01 erg/cm²/s
flux_1024_time	2.13e+02 erg/cm²/s
flux_64	8.00e+00 erg/cm²/s
flux_64_error	1.21e+00 erg/cm²/s

GCN 30880 table
GRB_name	GRB210925A
GCN_number	30880
Detection_method	Fermi GBM final loc
t_trigger	19:12:27 UTC
ra	347.4000°
decl	-17.1000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 30880 SUBJECT: GRB 210925A: Fermi GBM Final Real-time Localization DATE: 21/09/25 19:22:53 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 19:12:27 UT on 25 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210925A (trigger 654289952.965146 / 210925800). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 347.4, Dec = -17.1 (J2000 degrees, equivalent to J2000 23h 09m, -17d 06'), with a statistical uncertainty of 3.3 degrees. The angle from the Fermi LAT boresight is 82.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210925800/quicklook/glg_skymap_all_bn210925800.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210925800/quicklook/glg_healpix_all_bn210925800.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210925800/quicklook/glg_lc_medres34_bn210925800.gif

GCN 30881 table
GRB_name	GRB210925A
GCN_number	30881
Detection_method	Fermi GBM Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 30881 SUBJECT: GRB 210925A: GECAM detection DATE: 21/09/26 09:27:52 GMT FROM: Chao Zheng at IHEP C. Zheng, S. L. Xiong, S. Xiao, Y. Q. Zhang, W. C. Xue, X. Y. Song, X. Y. Zhao, Y. Huang, S. L. Xie, C. Cai, Y. Zhao, Z. W. Guo, X. L. Zhang, C. Y. Li, C. W. Wang, Q. B. Yi, B. X. Zhang, P. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, J. C. Liu, L. M. Song, F. J. Lu, S. N. Zhang (IHEP), report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a long bright burst, GRB 210925A, at 2021-09-25T19:12:34.600 UTC (denoted as T0), which was also detected by Fermi/GBM (GCN #30880). Its alert data was promptly downlinked to the ground through the short message service of BeiDou Navigation Satellite System (BDS). The time latency of the first BeiDou message relative to the trigger time is about 1 minute. According to the BDS alert data, this burst mainly consists of multiple pulses with duration of about 10 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/utn210925_191234_GECAMb.png An automatic in-flight localization was calculated using the light curves and spectrum. Although the in-flight calibration of energy response and l ocalization has not been finalized yet, GECAM-B localized this burst to the following position (J2000): Ra: 357.83 deg Dec: -24.58 deg Err: 3.50 deg (1-sigma, statistical only) The current systematic error of location is estimated to be several degrees which could be minimized by the ongoing calibration. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS).