GCN Circular 30974
Subject
GRB 211024A: GECAM detection
Date
2021-10-24T14:44:10Z (3 years ago)
From
Shuo Xiao at IHEP <xiaoshuo@ihep.ac.cn>
S. Xiao, Yi Zhao, S. L. Xiong, C. Cai, J. J. He, Y. Huang, Z. W. Guo,
C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, W. C. Xue,
Q. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, C. Zheng, Y. Q. Du, D. Y. Guo,
J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu,
P. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP),
report on behalf of GECAM team:
During the commissioning phase, GECAM-B was triggered ground by a short
bright burst, GRB 211024A, at 2021-10-24T01:34:11.450 UTC (denoted as T0),
which was also detected by Fermi/GBM (GCN 30962).
According to the GECAM-B light curves in about 16-3500 keV, this
burst mainly consists of a broad pulse with a duration of about 0.1 s.
The GECAM light curve could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/tn211024_013411_gb.png
GECAM-B localized this burst to the following position (J2000):
Ra: 25.7 deg
Dec: 1.05 deg
Err: 28.73 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.
This location is consistent with Fermi/GBM position within the error.
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).