[vsnet-grb-info 20028] GRB 171103A: Insight-HXMT observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22116
SUBJECT: GRB 171103A: Insight-HXMT observation
DATE:    17/11/10 07:57:17 GMT
FROM:    Shaolin Xiong at IHEP  <xiongsl at ihep.ac.cn>

G. Li, J. Y. Liao, S. L. Xiong, C. K. Li, X. B. Li, C. Z. Liu,
X. F. Li, Z. W. Li, X. F. Lu, Z. Chang, J. L. Zhao, A. M. 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 2017-11-03T23:10:32.04 (T0),
Insight-HXMT/HE detected GRB 171103A (trigger ID: HEB171103965)
in a routine search of the data,which is also detected by
Swift/BAT (Ukwatta et al.,GCN 22095), Fermi/GBM (Veres et al., GCN 22100),
Konus-Wind (Tsvetkova et al.,GCN 22101) and AstroSat/CZTI
(Sharma et al., GCN 22103).

The Insight-HXMT light curve mainly consists of multi-pulses
with a duration (T90) of 0.21 s measured from T0+0.033 s.
The 10-ms peak rate, measured from T0+0.096 s, is 19946.0 cnts/sec.
The total counts from this burst is 2915.7 counts.

URL_LC: http://www.hxmt.org/images/GRB/HEB171103965_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+0.05 s to T0+0.30 s is
adequately fit by a Power Law model with spectral index = -0.97 ± 0.07.
The energy fluence is (4.1 ± 0.3)e-6 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 could be found at:
http://www.hxmt.org/index.php/enhome .