[vsnet-grb-info 19689] GRB 170803B: Insight-HXMT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21443
SUBJECT: GRB 170803B: Insight-HXMT detection
DATE:    17/08/10 12:10:33 GMT
FROM:    Shaolin Xiong at IHEP  <xiongsl at ihep.ac.cn>

X. Ma, S. L. Xiong, C. K. Li, J. Y. Liao, Y. Huang, X. B. Li,
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), 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:

During the commissioning phase, at 2017-08-03T22:00:31.78 (T0),
Insight-HXMT detected GRB 170803B (trigger ID: HEB170803917)
in a routine search of the data, which was also observed by
Konus-Wind (trig time: 22:00:35.981 UT).

The Insight-HXMT light curve shows a multi-peaked structure
with a duration (T90) of 0.27 s measured from T0.
The 20-ms peak rate, measured from T0+0.2 s, is 12443.1 cnts/sec.
The total counts from this burst is 1741.8 counts.

URL_LC: http://www.hxmt.org/images/GRB/HEB170803917_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 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 .