TITLE:   GCN CIRCULAR
NUMBER:  24575
SUBJECT: GRB 190515A: CALET Gamma-Ray Burst Monitor detection
DATE:    19/05/17 10:26:34 GMT
FROM:    Valentin Pal'shin at AGU  <val@phys.aoyama.ac.jp>

S. Sugita, A. Yoshida, T. Sakamoto, V. Pal'shin(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 short hard GRB 190515A (Fermi-LAT detection: Kocevski et al.,
GCN Circ. 24560; Fermi GBM detection: Roberts, GCN Circ. 24562)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:33:03.330 UTC
on 15 May 2019. The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse which starts at T+0 sec,
peaks at T+0.19 sec and ends at T+0.45 sec. The T90 and T50 durations
measured by the SGM data are 0.38 +- 0.14 sec and
0.19 +- 0.06 sec (40-1000 keV), respectively.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1241929925/

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