GRB 181119A

T. Sakamoto, A. Yoshida, V. Pal'shin, S. Sugita, Y. Kawakubo,
A. Tezuka, S. Matsukawa, H. Onozawa, T. Ito, H. Morita, Y. Sone (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U),
W. Ishizaki (ICRR), M. L. Cherry (LSU),
S. Ricciarini (U of Florence),
A. V. Penacchioni, P. S. Marrocchesi (U of Siena),
and the CALET collaboration:


The long GRB 181119A (Insight-HXMT/HE detection: Yi et al., GCN Circ. 23430
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 ;
AstroSat CZTI detection: Sharma et al., GCN Circ. 23438
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 ) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 14:32:16.825 UTC
on 19 November 2018. The burst signal was seen by all CGBM detectors.

The burst light curve shows three main peaks which start at T+0.3 sec and
end at T+15.8 sec. The T90 and the T50 durations measured by the SGM 
data are
15.0 +- 0.4 sec and 8.1 +- 3.2 sec (40-1000 keV), respectively.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1226673130/

The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.

V. Sharma and D. Bhattacharya (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 181119A, which was also detected by Insight-HXMT/HE detection (Yi Q. B. et al., GCN 23430
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 ).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 14:32:27.500 UT. The measured peak count rate is 350 cts/s above the background in combined data of four quadrants, with a total of 1971 cts. The local mean background count rate was 488 cts/s. Using cumulative rates, we measure a T90 of 19.6 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.

Q. B. Yi, 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, J. L. Zhao,
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, 
H. Y. Wang, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), 
report on behalf of the Insight-HXMT team: 

At 2018-11-19T14:32:27.200 (T0), the Insight-HXMT/HE detected 
GRB 181119A (trigger ID: HEB181119605) in a routine search of the data,
which was also triggered by Fermi/GBM (trigger number 564330742)

The Insight-HXMT/HE light curve mainly consists of multiple 
pulses with a duration (T90) of 14.82 s measured from T0-10.03 s. 
The 1-s peak rate, measured from T0+4.79 s, is 680.6 cnts/s. 
The total counts from this burst is 2060.5 counts. 
URL_LC:  http://www.hxmt.org/images/GRB/HEB181119605_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.