GCN Circular 42734
Subject
GRB 251116D: Insight-HXMT/HE detection
Event
Date
2025-11-18T11:24:24Z (4 days ago)
From
Xinghao Luo at SVOM/GRN <2952704891@qq.com>
Via
Web form
Xing-hao Luo, Chen-Wei Wang, Chao Zheng, and Shao-Lin Xiong (IHEP) report on behalf of the Insight-HXMT team:
At 2025-11-16T19:22:36.500 (T0), Insight-HXMT/HE detected the long burst GRB 251116D, which is also detected by AstroSat/CZTI (Harsha K. H. et.al., GCN #42175) , Konus-Wind and Glowbug (C.C. Cheung et.al., GCN #42178)
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a T90 of 38 +5/-12 s. The 1s peak rate, measured from T0+0.5 s, is 4335 cnts/sec. Insight-HXMT/HE detected a total of 26858 counts form this burst.
The HXMT/HE light curve can be found here:
https://www.bursthub.cn//admin/static/hxmtgrb251116D.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://www.hxmt.org