TITLE: GCN CIRCULAR NUMBER: 45392 SUBJECT: GRB 260810A: Insight-HXMT/HE detection DATE: 26/08/18 06:57:05 GMT FROM: yzh807926@163.com Zheng-Hang Yu, Chao Zheng, and Shao-Lin Xiong (IHEP) report on behalf of the Insight-HXMT team: At 2026-08-10T19:09:43.350 (T0), Insight-HXMT/HE detected GRB 260810A, which is also detected by AstroSat CZTI (A. Arya et al., GCN #45363), and Glowbug (C.C. Cheung et al., GCN #45365) The Insight-HXMT/HE light curve mainly consists of two pulses with a T90 of 18.0 +7.0/-5.5 s. The 1 s peak rate, measured from T0+0.25 s, is 4028 cnts/sec. Insight-HXMT/HE detected a total of 15728 counts from this burst. The Insight-HXMT/HE light curve can be found here: https://www.bursthub.cn/gcn/2026/hxmtgrb260810A.png All measurements above are made with the CsI detectors of Insight-HXMT/HE operating in the Normal mode with the energy range of about 60-900 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmten.ihep.ac.cn View this GCN Circular online at https://gcn.nasa.gov/circulars/45392. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...