TITLE: GCN CIRCULAR NUMBER: 46067 SUBJECT: GRB 261024C: GECAM-B observation DATE: 26/10/28 13:48:20 GMT FROM: Jin-Ye Luo Jin-Ye Luo, Chen-Wei Wang, Chao Zheng, Yue Wang, Zheng-Hang Yu, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: GECAM-B was triggered on-ground by GRB 261024C at 2026-10-24T18:24:11.250 UTC (denoted as T0), which is also detected by AstroSat/CZTI (Harsha K. H. et al., GCN #46039) and NuSTAR (G. Waratkar et al., GCN #46050). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of 39.0 +13/-5 s. The on-ground calculated location, using the GECAM-B trigger data, is RA = 30.4 deg, Dec = 46.5 deg, with a statistical uncertainty of 1.8 deg. The GECAM-B light curve can be found here: https://www.bursthub.cn/gcn/2026/gecambgrb261024C.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).