TITLE:   GCN CIRCULAR
NUMBER:  42210
SUBJECT: GRB 251011A: Insight-HXMT detection
DATE:    25/10/12 16:37:23 GMT
FROM:    Chenwei Wang at IHEP <cwwang@ihep.ac.cn>

Chen-Wei Wang, Xing-Hao Luo, Cheng-Kui Li, Shao-Lin Xiong, and Chao Zheng report on behalf of the Insight-HXMT team:

At 2025-10-11T03:41:40.000 (T0), Insight-HXMT/HE detected the burst GRB 251011A, which is also detected by Fermi/GBM (Fermi GBM team, GCN#42195) and AstroSat (M. Tembhurnikar et al., GCN#42199).

The Insight-HXMT/HE light curve mainly consists of a single pulse with a T90 of 3.6 +1.6/-1.4 s. The 1s peak rate, measured from T0, is 788 cnts/sec. The total counts from this burst is 1444 counts.

The HXMT/HE light curve can be found here:
https://www.bursthub.cn//admin/static/hxmtgrb251011A.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.