GCN Circular 31382
Subject
GRB 220104A：GECAM detection
Date
2022-01-04T08:29:45Z (3 years ago)
From
Guoying Zhao at IHEP <gyzhao@ihep.ac.cn>
Z. W. Guo, S. L. Xiong, C. Cai, S. Xiao, P. Zhang,
C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song,
J. C. Liu, Y. Zhao, Y. Q. Zhang, C. Zheng, W. C. Xue, C. W. Wang,
Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li,
X. Ma, L. M. Song, 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, X. L. Zhang,
H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li,
X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun,
Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang,
C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang,
X. Zhou, 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 220104A, at 2022-01-04T04:01:02.850 UTC (denoted as T0)���
which was also observed by Fermi/GBM (GCN #31380).
According to the BDS alert data, this burst mainly consists of a broad pulse
with a duration of about 2 s.
The GECAM light curve could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_94968062.png
GECAM-B localized this burst to the following position (J2000):
ra: 192.9 deg
dec: 37.3 deg
err: 10.1 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.
The GECAM preliminary location could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_sky_fit_94968062.png
This position is consistent with the Fermi GBM team localization
(trigger #662961667) 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).