GCN Circular 40954
Subject
GRB 250702A: Insight-HXMT detection
Event
Date
2025-07-04T14:59:42Z (3 days ago)
From
Chenwei Wang at IHEP <cwwang@ihep.ac.cn>
Via
Web form
Chen-Wei Wang, Shao-Lin Xiong, and Chao Zheng report on behalf of the Insight-HXMT team:
At 2025-07-02T09:54:07.850 (T0), Insight-HXMT/HE detected the short burst GRB 250702A, which is also detected by Fermi/GBM (Fermi GBM Team, GCN #40081), GECAM-B (Wang et al., GCN #40922) and CALET/GBM (K. Kobayashi, GCN #40932).
The Insight-HXMT/HE light curve mainly consists of a single pulse with a T90 of 11.0 +3.0/-6.0 s.
The 1s peak rate, measured from T0+3.550 s, is 3704 cnts/sec.
The total counts from this burst is 19343 counts.
The HXMT/HE light curve can be found here:
https://www.bursthub.cn//admin/static/hxmtgrb250702A.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.