GCN 45688: GRB 260920B/EP260920b: GECAM-B detection of a burst

2026-09-22T05:31:59.630Z | rev 0 | event: GRB 260920B

Zheng-Hang Yu, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:

GECAM-B detected a burst GRB 260920B/EP260920b at 2026-09-20T14:11:37.000 UTC (denoted as T0). According to the GECAM-B light curves in about 70-6000 keV, this burst consists of two main episodes with multiple pulses with a T90 of 162.0 +118.0/-10.0 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn/gcn/2026/9/gecambgrb260920B.png


Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).