TITLE: GCN CIRCULAR NUMBER: 42633 SUBJECT: GRB 251106B: Insight-HXMT detection DATE: 25/11/10 08:36:11 GMT FROM: zhangjinpeng@ihep.ac.cn Jin-Peng Zhang, Chen-Wei Wang, Cheng-Kui Li and Shao-Lin Xiong report on behalf of the Insight-HXMT team: At 2025-11-06T18:14:44.000(T0), Insight-HXMT/HE detected the burst GRB 251106B, which is also detected by SVOM/GRM (Wang et al., GCN#42612). The Insight-HXMT/HE light curve mainly consists of several short spikes with a T90 of 1.55 +0.15/-0.35 s. The 1s peak rate, measured from T0+0.275 s, is 1078 cnts/sec. The total counts from this burst is 1511 counts. The HXMT/HE light curve can be found here: https://www.bursthub.cn//admin/static/hxmtgrb251106B.png All measurements above are made with the CsI detectors operating in the regular 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/42633. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...