GCN 45502: GRB 260831A: GECAM-B observation

2026-09-03T15:12:15.263Z | rev 0 | event: GRB 260831A
Jin-Ye Luo, Chen-Wei Wang, Yue Wang, Chao Zheng, Zheng-Hang Yu, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: 

GECAM-B was triggered in-flight by GRB 260831A at 2026-08-31T04:09:02.000 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #45473).

According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of a single pulse with a duration (T90) of 4 +2/-2 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn/gcn/2026/gecambgrb260831A.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).