TITLE:   GCN CIRCULAR
NUMBER:  35647
SUBJECT: GRB 240128A: CALET Gamma-Ray Burst Monitor detection
DATE:    24/01/28 23:37:46 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, 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 240128A (MAXI/GSC detection, Yamaoka et al., 
GCN Circ. 35646) triggered the CALET Gamma-ray Burst Monitor
(CGBM) at 15:13:34.34 UTC on 28 January 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1390489809/).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a multi-peaked structure that starts
at T+1.4 sec, peaks at T+10.8 sec, and ends at T+15.2 sec.
The T90 and T50 durations measured by the SGM data are 12.5 +/- 0.6 sec
and 7.2 +/- 0.6 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1390489809/index.html

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