[vsnet-grb-info 20354] SUBJECT: GRB 180210A: Insight-HXMT/HE observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22450
SUBJECT: SUBJECT: GRB 180210A: Insight-HXMT/HE observation
DATE:    18/02/26 02:59:43 GMT
FROM:    Xuefeng Lu at IHEP  <luxf at ihep.ac.cn>

X. F. Lu, J. Y. Liao, C. K. Li, Y. Huang, Y. Zhu, S. L. Xiong, X. B. Li,
C. Z. Liu, Z. W. Li, J. L. Zhao, Y. F. Zhang, X.F. Li, Z. Chang, Y. J. Jin, 
C. L. Zou (IHEP), A. M. Zhang, Z. Zhang (THU), T. P. Li (IHEP/THU),
F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:
 
At 2018-02-10T17:29:06.000 UT, the Insight-HXMT/HE detected
GRB 180210A(trigger ID: HEB180210728) in a routine search of the data,
which was also triggered by Fermi/GBM(GCN Circ. 22407),Fermi/LAT(GCN Circ. 22408), 
Swift/XRT(GCN Circ. 22413) and KONUS-Wind(GCN Circ. 22415).
 
The Insight-HXMT/HE light curve consists of a multi-peaked pulse
with a duration (T90) of 26.7 s measured from T0+3.9 s.
The 1-s peak rate, measured from T0+23.9 s, is 3173.8 cnts/sec.
The total counts from this burst is 40447.9 counts.

URL_LC: http://www.hxmt.org/images/GRB/HEB180210517_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 (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.

The time-averaged spectrum from T0-8 to T0+30 s is adequately fit by a Power
Law model with spectral index = -1.86 +/- 0.03. The energy fluence is 
(4.5 +/- 0.2) E-05 erg/cm^2 in 200 - 5000 keV in this time interval.
 
The analysis results presented above are preliminary, 
final results will be published elsewhere.
 
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/index.php/enhome.