GCN Circular 21921
Subject
GRB 170906A: Insight-HXMT detection
Event
Date
2017-09-24T03:22:42Z (8 years ago)
From
Yifei Zhang at IHEP <zhangyf@ihep.ac.cn>
Y. F. Zhang, S. L. Xiong, J. Y. Liao, C. K. Li, X. F. Lu, X. B. Li,
C. Z. Liu, X. F. Li, Z. W. Li, 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 2017-09-06T00:43:06.00 (T0),
Insight-HXMT/HE detected GRB 170906A (trigger ID: HEB170906029)
in a routine search of the data,which is also detected by CALET
(Penacchioni et al., GCN 21884), Fermi/GBM (Hamburg et al., GCN 21839)
and Swift/BAT (Siegel et al., GCN 21821).
The Insight-HXMT light curve mainly consists of multi-pulses
with a duration (T90) of 64.6 s measured from T0+2.3 s.
The 1-second peak rate, measured from T0+35.3 s, is 1870.6 cnts/sec.
The total counts from this burst is 26305.3 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB170906029_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 T0-5 s to T0+70 s is
adequately fit by a Power Law model with spectral index = -2.70 +/- 0.06.
The energy fluence is (5.94 +/- 0.20)E-04 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 .