GRB 211024A: GECAM detection

During the commissioning phase, GECAM-B was triggered ground by a short bright burst, GRB 211024A, at 2021-10-24T01:34:11.450 UTC (denoted as T0), which was also detected by Fermi/GBM (GCN 30962). According to the GECAM-B light curves in about 16-3500 keV, this burst mainly consists of a broad pulse with a duration of about 0.1 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/tn211024_013411_gb.png GECAM-B localized this burst to the following position (J2000): Ra: 25.7 deg Dec: 1.05 deg Err: 28.73 deg (1-sigma, statistical only) The current systematic error of location is estimated to be several degrees which could be minimized by the ongoing calibration. This location is consistent with Fermi/GBM position within the error. Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS).