TITLE:   GCN CIRCULAR
NUMBER:  45858
SUBJECT: GRB 261005A: GECAM-B observation
DATE:    26/10/08 12:19:59 GMT
FROM:    guohx@ihep.ac.cn

Hao-Xuan Guo, Chen-Wei Wang, Chao Zheng, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:

GECAM-B was triggered on-ground by GRB 261005A, at 2026-10-05T20:19:04.500 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #45811) and Glowbug (C.C. Cheung et al., GCN #45820).

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 9.0 +5.0/-5.5 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn/gcn/2026/gecambgrb261005A.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).