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GCN Circular 26246

Subject
GRB 191027A: CALET Gamma-Ray Burst Monitor detection
Date
2019-11-14T01:02:06Z (5 years ago)
From
Valentin Pal'shin at AGU <val@phys.aoyama.ac.jp>
T. Tamura (Kanagawa U),
A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka, S. Torii (Waseda U), Y. Shimizu (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:

GRB 191027A (Fermi GBM Final Real-time Localization: Fermi GBM Team,
GCN Circ. 26078; BALROG localization: Biltzinger et al., GCN Circ. 26079,
26096; IPN triangulation: Hurley et al., GCN Circ. 26087; Konus-Wind
observation: Ridnaia et al., GCN Circ. 26100;
https://gcn.gsfc.nasa.gov/other/191027A.gcn3)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 15:19:06.826 UTC
on 27 October 2019. The burst signal was seen by all CGBM detectors.

The burst light curve shows a FRED-like pulse which starts at T+0.6 sec,
peaks at T+0.9 sec and ends at T+3.0 sec. The T90 and T50 durations
measured by the SGM data are 1.9 +- 0.6 sec and 0.6 +- 0.3 sec
(40-1000 keV), respectively.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1256224690/

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