GRB 190131A
GCN Circular 23828
Subject
GRB 190131A: Insight-HXMT/HE detection
Date
2019-02-01T14:48:23Z (7 years ago)
From
Ce Cai at IHEP <caice@ihep.ac.cn>
C. Cai, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang,
Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song,
M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:
At 2019-01-31T23:08:35.000 (T0), the Insight-HXMT/HE detected
GRB 190131A (trigger ID: HEB190131964) in a routine search of the data,
which was also triggered by Fermi/GBM (trigger number 570668920);
AstroSAT (T. Khanam et al., GCN 23827);
The Insight-HXMT/HE light curve mainly consists of multiple
pulses with a duration (T90) of 23.40 s measured from T0+0.98 s.
The 1-s peak rate, measured from T0+2.04 s, is 1371.5 cnts/s.
The total counts from this burst is 15799.2 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190131964_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.
Insight-HXMT is the first Chinese space X-ray telescope, which was
fundedjointly by the China National Space Administration (CNSA) and
the Chinese Academy of Sciences (CAS).
More information could be found at: http://www.hxmt.org.
GCN Circular 23827
Subject
GRB 190131A: AstroSat CZTI detection
Date
2019-02-01T13:39:46Z (7 years ago)
From
Tanazza Khanam at IUCAA <tanazza@iucaa.in>
T. Khanam, V. Sharma, D. Bhattacharya and A. Vibhute (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 190131A.
The source was clearly detected in the 20-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 23:08:38.5 UT. The measured peak count rate is 216 cts/s above the background in the combined data of four quadrants, with a total of 2804 cts. The local mean background count rate was 518 cts/s. Using cumulative rates, we measure a T90 of 17.6 s.
It was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.