TITLE: GCN CIRCULAR NUMBER: 44724 SUBJECT: GRB 260527A: GECAM-B detection of a short burst probably associated with EP260527a DATE: 26/05/28 14:41:34 GMT FROM: yzh807926@163.com Zheng-Hang Yu, Chen-Wei Wang, Shao-Lin Xiong, Chao Zheng, Cheng-Kui Li (IHEP) report on behalf of GECAM team: GECAM-B was triggered in-flight by a short burst GRB 260527A at 2026-05-27T06:16:10.050 UTC (denoted as T0), which is also detected by Konus-Wind (D. Svinkin et al., GCN#44722). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multi-pulses with a duration (T90) of 0.40 +0.02/-0.04 s. The on-ground localization of GECAM-B is: Ra: 206.1 deg Dec: 6.7 deg Err: 4.9 deg (1-sigma, statistical only) Considering possible systematic uncertainties, this localization is consistent with the EP/WXT localization of EP260257a (Yang et al., GCN#44718). The time coincidence and localization coincidence between GRB 260527A and EP260527a strongly support the association of these two events. The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260527A.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). View this GCN Circular online at https://gcn.nasa.gov/circulars/44724. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...