TITLE:   GCN CIRCULAR
NUMBER:  35187
SUBJECT: GRB 231123C: Insight-HXMT/HE detection
DATE:    23/11/25 12:47:01 GMT
FROM:    yqzhang_cl@163.com

Y.Q Zhang, S. L. Xiong, X. B. Li and C. K. Li
report on behalf of the Insight-HXMT team:

At 2023-11-23T19:58:25.38 (T0), Insight-HXMT/HE detected
GRB 231123C (trigger ID: HEB231123832) in a routine search of the data,
which was also observed by Fermi/GBM (Fermi GBM Team, GCN 35171),
Swift/BAT(James DeLaunay et al., GCN 35179) and 
Glowbug (C. C. Cheung et al., GCN 35184). 

The Insight-HXMT/HE light curve mainly consists of single
pulse with a duration (T90) of 0.41 s measured from T0-0.24 s.
The 1-ms peak rate, measured from T0-0.09 s, is 1741 cnts/sec.
The total counts from this burst is  291 counts.
URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB231123832_lc.jpg

All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 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
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.