TITLE:   GCN CIRCULAR
NUMBER:  43961
SUBJECT: GRB260307A: GECAM-B observation of a burst
DATE:    26/03/11 14:52:31 GMT
FROM:    xueyuan zao <zaoxueyuan@gmail.com>

Xue-Yuan Zao, Chen-Wei Wang, Chao Zheng, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:

GECAM-B was triggered on-ground by GRB 260307A, at 2026-03-07T11:27:59.350 UTC, which is also detected by Fermi/GBM (Fermi GBM team, GCN #43939).

According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses, with a duration (T90) of 4.5 +1.0/-0.5 s. 

The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260307A.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).