[vsnet-grb-info 28575] GRB 210822A: GECAM detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30678
SUBJECT: GRB 210822A: GECAM detection
DATE:    21/08/22 11:31:19 GMT
FROM:    Shaolin Xiong at IHEP  <xiongsl at ihep.ac.cn>

C. W. Wang, S. L. Xiong, X. Y. Zhao, X. Y. Song, C. Cai, C. Y. Li,
Y. Huang, S. L. Xie, J. C. Liu, Y. Q. Zhang,  Y. Zhao, Z. W. Guo, C. Zheng,
Z. H. An, C. Chen, G. Chen, W. Chen, M. Gao, K. Gong, D. Y. Guo, J. J. He,
B. Li, C. Li, J. H. Li, Q. X. Li, X. B. Li, X. Q. Li, Y. G. Li,
X. H. Liang, J. Y. Liao, J. C. Liu, X. J. Liu, Y. Q. Liu, F. J. Lu,
Q. Luo, X. Ma, G. Ou, W. X. Peng, R. Qiao, D. L. Shi, J. Y. Shi,
L. M. Song, G. X. Sun, X. L. Sun, Y. L. Tuo, J. Z. Wang,X. L. Zhang,
W. C. Xue, X. Y. Wen, S. Xiao, Y. B. Xu, Y. P. Xu, S. Yang, M. Yao,
Q. B. Yi, B. X. Zhang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang,
H. M. Zhang, K. Zhang, P. Wang, P. Zhang, S. N. Zhang, Z. Zhang,
S. Y. Zhao, S. J. Zheng, X. Zhou (IHEP), report on behalf of GECAM team:

During the commissioning phase, GECAM-B was triggered in-flight
by a long bright burst, GRB 210822A, at 2021-08-22T09:18:18.00 UTC
(denoted as T0), which is also observed by Swift/BAT (GCN #30677).
Its alert data was downlinked to the ground through the
short message service of BeiDou Navigation Satellite System (BDS).

According to the GECAM-B light curves in about 30-1000 keV
from BDS alert data, this burst mainly consists of multiple
pulses with a duration of about 15 s.

The GECAM light curve could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_83323099.png

An automatic localization was calculated using the light curves and 
spectrum,
and the GECAM location is consistent with the Swift/BAT 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).