TITLE: GCN CIRCULAR NUMBER: 40978 SUBJECT: GRB 250704B: Insight-HXMT detection DATE: 25/07/05 15:09:12 GMT FROM: Chenwei Wang at IHEP <cwwang@ihep.ac.cn> Chen-Wei Wang, Shao-Lin Xiong, Cheng-Kui Li, and Chao Zheng report on behalf of the Insight-HXMT team: At 2025-07-04T08:16:27.100 (T0), Insight-HXMT/HE detected the short burst GRB 250704B/ EP250704a, which is also detected by SVOM/GRM (Wang et al., GCN #40940), Konus-Wind (Dmitry Frederiks et al., GCN # 40972) and EP (Li et al., GCN # 40941). The Insight-HXMT/HE light curve mainly consists of double pulses with a T90 of 0.68 +0.34/-0.48 s. The total counts from this burst is 2046 counts. The HXMT/HE light curve can be found here: https://www.bursthub.cn//admin/static/hxmtgrb250704B.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/40978. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...