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GCN Circular 25038

Subject
GRB 190706C: CALET Gamma-Ray Burst Monitor detection
Date
2019-07-09T10:01:00Z (5 years ago)
From
Valentin Pal'shin at AGU <val@phys.aoyama.ac.jp>
T. Sakamoto, A. Yoshida, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The bright GRB 190706C (IPN triangulation: Svinkin et al., GCN
Circ. 25035) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 13:42:22.560 UTC on 6 July 2019.
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single multi-peaked emission episode which
starts at T+3.5 sec, peaks at T+6.6 sec and ends at T+10.4 sec. The T90
and T50 durations measured by the SGM data are 3.9 +- 0.8 sec and
2.2 +- 0.1 sec (40-1000 keV), respectively.

Despite the burst high intensity there is almost no emission above ~1 MeV.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1246455687/

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