GCN Circular 43434
Subject
GRB 260115A: GECAM-B observation
Event
Date
2026-01-17T00:47:57Z (8 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 260115A, at 2026-01-15T17:46:45.900 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43417).
According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of a bright pulse and some fainter emissions, with a duration (T90) of 4.8 +2.4/-1.4 s.
The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260115A.png
The time-averaged spectrum from T0 - 1.0 to T0 + 4.0 s is best fitted by a power law function. The power law index is -2.2 +0.3/-0.4. The event fluence (10-1000 keV) in this time interval is (2.8 +0.7/-0.4)E-06 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).