TITLE: GCN CIRCULAR NUMBER: 45500 SUBJECT: GRB 260827A: Insight-HXMT/HE detection DATE: 26/09/03 13:42:27 GMT FROM: yzh807926@163.com Zheng-Hang Yu and Shao-Lin Xiong (IHEP) report on behalf of the Insight-HXMT team: At 2026-08-27T10:43:00.600 (T0), Insight-HXMT/HE detected GRB 260827A, which is also detected by Fermi/GBM (Fermi GBM team, GCN #45453), Glowbug (C.C. Cheung et al., GCN #45475), and SVOM/GRM (Yu et al., GCN #45479). The Insight-HXMT/HE light curve mainly consists of multiple pulses with a T90 of 1.6 +1.6/-0.7 s. The 1 s peak rate, measured from T0-0.85 s, is 932 cnts/sec. Insight-HXMT/HE detected a total of 1396 counts from this burst. The Insight-HXMT/HE light curve can be found here: https://www.bursthub.cn/gcn/2026/hxmtgrb260827A.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://www.hxmt.org View this GCN Circular online at https://gcn.nasa.gov/circulars/45500. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...