GCN 43054: GRB 251208A: GECAM-B observation of a short burst

2025-12-09T16:15:06.311Z | rev 0 | event: GRB 251208A

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

GECAM-B was triggered on-ground by GRB 251208A, at 2025-12-08T09:25:57.550 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43027) and SVOM/GRM (Yue Wang et al., GCN #43042). 

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 2.4 +0.7/-1.2 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb251208A.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).