TITLE:   GCN CIRCULAR
NUMBER:  36719
SUBJECT: GRB 240619A: CALET Gamma-Ray Burst Monitor detection
DATE:    24/06/21 07:03:46 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

S. Torii (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR),
Y. Akaike, K. Kobayashi (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 long GRB 240619A (Fermi GBM Final Real-time Localization: Fermi GBM team,
GCN Circ. 36694; BALROG localization: Preis et al., GCN Circ. 36695; Fermi GBM 
Observation: Dalessi et al., GCN Circ. 36717) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 03:43:30.40 UTC on 19 June 2024
(https://cgbm.calet.jp/cgbm_trigger/flight/1402803348/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a double-peaked structure that starts
at T+0.6 sec, peaks at T+1.1 sec, and ends at T+37.4 sec.
The T90 and T50 durations measured by the SGM data are 35.0 +/- 1.3 sec
and 28.5 +/- 1.1 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1402803348/

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