TITLE:   GCN CIRCULAR
NUMBER:  43113
SUBJECT: GRB 251214B: GECAM-B observation of a long burst
DATE:    25/12/15 09:50:28 GMT
FROM:    Xinghao Luo at SVOM/GRN <2952704891@qq.com>

Xing-Hao Luo, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:

GECAM-B was triggered in-flight by GRB 251214B, at 2025-12-14T09:02:19.10 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43088).

According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of  17.7 +1.8/-1.2 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb251214B.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).