GCN Circular 43736
Subject
GRB 260212A: GECAM-B observation
Event
Date
2026-02-14T13:54:35Z (14 days ago)
From
zhangjinpeng@ihep.ac.cn
Via
Web form
Jin-Peng Zhang, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:
GECAM-B was triggered in-flight by GRB 260212A, at 2026-02-12T17:49:07.800 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43716), Glowbug (C.C. Cheung et al., GCN #43719) and SVOM/GRM (Jin-Peng Zhang et al., GCN #43727).
According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses, with a duration (T90) of 24 +/- 7 s.
The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260212A.png
The time-averaged spectrum from T0 - 1.0 to T0 + 11.0 s (photon energy > 70 keV) is fitted by a power law function. The power law index is -2.53 +0.14/-0.15. The event fluence (10-1000 keV) in this time interval is (1.07 +0.09/-0.13)E-05 erg/cm^2.
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).