TITLE:   GCN CIRCULAR
NUMBER:  35806
SUBJECT: GRB 240225C: CALET Gamma-Ray Burst Monitor detection
DATE:    24/02/26 20:51:06 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

S. Sugita , A. Yoshida, T. Sakamoto (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 240225C (INTEGRAL SPI ACS Trigger: Trigger Num. 10590;  
IPN RAW NOTICE (KONUS/Wind);  AstroSat CZTI detection: Joshi et al., 
GCN Circ. 35799; GRBAlpha detection: Ripa et al., GCN Circ. 35802) 
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 05:19:32.73
UTC on 25 February 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1392873321/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse that starts
at T+2.6 sec, peaks at T+4.2 sec, and ends at T+22.6 sec.
The T90 and T50 durations measured by the SGM data are 13.1 +/- 3.4 sec
and 4.6 +/- 0.4 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1392873321/index.html

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