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GRB 190323A

GCN Circular 24005

Subject
GRB 190323A: Insight-HXMT/HE detection
Date
2019-03-25T12:13:39Z (6 years ago)
From
Qi Luo at IHEP <luoqi@ihep.ac.cn>
Q. Luo, 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, X. F. Lu,
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, 
M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:

At 2019-03-23T21:05:24.000 (T0), the Insight-HXMT/HE detected
GRB 190323A(trigger ID: HEB190323878) in a routine search of the data,
which was also triggered by Fermi/GBM(F. Kunzweiler et al. ,GCN 23990).

The Insight-HXMT/HE light curve mainly consists of multiple 
pulses with a duration (T90) of 42.40 s measured from T0-5.50 s.
The 1-ms peak rate, measured from T0-0.190 s, is 938 cnts/sec.
The total counts from this burst is 13490 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190323878_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 about it could be found at:
http://www.hxmt.org.

GCN Circular 24025

Subject
GRB 190323A: AstroSat CZTI detection
Date
2019-03-30T11:48:56Z (6 years ago)
From
Vidushi Sharma at IUCAA <vidushi@iucaa.in>
V. Sharma, D. Bhattacharya, A. Vibhute and T. Khanam (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 190323A, which was also detected by Insight-HXMT/HE (Luo Q. et al., GCN # 24005).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with strongest peak at 21:05:40.500 UT. The measured peak count rate associated with the burst is 153 cts/s above the background in the combined data of four quadrants, with a total of 1848 cts. The local mean background count rate was 533 cts/s. Using cumulative rates, we measure a T90 of 36.6 s.

It was also clearly 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.

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