TITLE: GCN CIRCULAR NUMBER: 41457 SUBJECT: GRB 250819A: Insight-HXMT detection DATE: 25/08/21 05:50:42 GMT FROM: Chenwei Wang at IHEP <cwwang@ihep.ac.cn> Chen-Wei Wang, Wen-Jun Tan, Yue Huang, Shao-Lin Xiong, and Chao Zheng report on behalf of the Insight-HXMT team: At 2025-08-19T17:49:46.000 (T0), Insight-HXMT/HE detected an intermedium duration burst GRB 250819A. The Insight-HXMT/HE light curve mainly consists of multi-pulses with a T90 of 7.5 +3.2/-2.9 s. The 1s peak rate, measured from T0-0.25 s, is 1153 cnts/sec. The total counts from this burst is 4769 counts. The HXMT/HE light curve can be found here: https://www.bursthub.cn//admin/static/hxmtgrb250819A.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.or View this GCN Circular online at https://gcn.nasa.gov/circulars/41457. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...