GCN Circular 46013
Subject
GRB 261019A: Insight-HXMT/HE detection
Event
Date
2026-10-23T09:41:40Z (4 days ago)
From
guohx@ihep.ac.cn
Via
Web form
Hao-Xuan Guo, Zheng-Hang Yu, Chen-Wei Wang, Cheng-Kui Li, Shao-Lin Xiong, and Chao Zheng (IHEP) report on behalf of the Insight-HXMT team:
At 2026-10-19T09:14:11.500 (T0), Insight-HXMT/HE detected a long burst, GRB 261019A, which is also detected by Fermi/GBM (Fermi GBM team, GCN #45989).
The Insight-HXMT/HE light curve mainly consists of a pulse with a T90 of 100 +/-12 s. The 1s peak rate, measured from T0+1.5 s, is 895 cnts/sec. Insight-HXMT/HE detected a total of 24784 counts from this burst.
The HXMT/HE light curve can be found here:
https://www.bursthub.cn/gcn/2026/hxmtgrb261019A.png
All measurements above are made with the CsI detectors of Insight-HXMT/HE 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://hxmten.ihep.ac.cn/