TITLE:   GCN CIRCULAR
NUMBER:  46245
SUBJECT: GRB 261111A: GECAM-B observation of a burst
DATE:    26/11/13 15:20:32 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 in-flight by GRB 261111A, at 2026-11-11T11:27:10.050 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #46224).

According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of 41 +3/-1 s.

The GECAM-B light curve can be found here:
https://www.bursthub.cn/gcn/2026/gecambgrb261111A.png

The time-averaged spectrum from T0-10 to T0 + 40 s is best fitted by a power law function. The power law index is -1.70 +0.13/-0.11. The event fluence (10-1000 keV) in this time interval is (2.05 +0.15/-0.20) 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).