[vsnet-grb-info 21468] GRB 181225A: Insight-HXMT/HE detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23567
SUBJECT: GRB 181225A: Insight-HXMT/HE detection
DATE:    18/12/27 14:05:53 GMT
FROM:    QiBin Yi at IHEP, HXMT  <yiqb at ihep.ac.cn>

Q. B. Yi, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, 
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, J. L. Zhao,
A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, 
Z. Zhang (THU), T. P. Li (IHEP/THU), L. M. Song, 
M. Wu, Y. P. Xu, S. N. Zhang (IHEP), 
report on behalf of the Insight-HXMT team: 

At 2018-12-25T11:44:10.000 (T0), the Insight-HXMT/HE detected 
GRB 181225A (trigger ID: HEB181225489) in a routine search of the data, 
which was also triggered by by AGILE/MCAL (A. Ursi et al.,GCN23560)、
Fermi/LAT (M. Arimoto et al., GCN23561) and Fermi/GBM (S.Poolakkil., GCN23562).

The Insight-HXMT/HE light curve mainly consists of multiple 
pulses with a duration (T90) of 1.23 s measured from T0+0.46 s. 
The 50-ms peak rate, measured from T0+1.208 s, is 2963.2 cnts/s. 
The total counts from this burst 2350.8 counts. 
URL_LC: http://www.hxmt.org/images/GRB/HEB181225489_lc.jpg 

All measurements above are made with the CsI detectors operating in the 
GRB mode with the energy range of about 200-3000 keV (record 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 
fundedjointly by the China National Space Administration (CNSA) and 
the Chinese Academy of Sciences (CAS). 
More information could be found at: http://www.hxmt.org.