GCN Circular 22149
Subject
GRB 171120A: Insight-HXMT detection
Date
2017-11-23T15:03:23Z (6 years ago)
From
Zhengwei Li at IHEP <lizw@ihep.ac.cn>
Z. W. Li, J. Y. Liao, C. K. Li, X. B. Li, S. L. Xiong, C. Z. Liu,
X. F. 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 2017-11-20T13:20:02.00 (T0),
Insight-HXMT detected GRB 171120A (trigger ID: HEB171120555)
in a routine search of the data, which was also observed by
Swift/BAT (A. Tohuvavohu et al, GCN Circ.22133), Swift/XRT(P.A. Evans
et al, GCN Circ.22135),Fermi/GBM(M.Stanbro et al, GCN Circ.22138),
Fermi/LAT(F. Longo et al, GCN Circ.22136), Konus-Windan(D.Frederiks
et al, GCN Circ.22142) and AstroSat/CZTI (V.Sharma et al, GCN Circ.22143).
The Insight-HXMT light curve consists of two pulses with a duration (T90)
of 39.9s measured from T0+0.5s. The 200-ms peak rate, measured from
T0+0.6s, is 6895.7 cnts/sec. The total counts from this burst is 5746.9
counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB171120555_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 T0-0.2 to T0+1.0 s is adequately fit by
a Power Law model with spectral index = -1.96 +/- 0.07 . The energy fluence
is (6.20 +/- 0.33) E-06 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 .
