TITLE:   GCN CIRCULAR
NUMBER:  42996
SUBJECT: GRB 251203A: GECAM-B observation of a burst
DATE:    25/12/05 07:58:43 GMT
FROM:    renyz16607@163.com

Yang-Zhao Ren, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:

GECAM-B was triggered on-ground by GRB 251203A, at 2025-12-03T08:18:45.150 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #42968), and SVOM/GRM (Ren et al., GCN #42995). 

According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of 14 +1/-3 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb251203A.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).