TITLE:   GCN CIRCULAR
NUMBER:  35198
SUBJECT: GRB 231125A: CALET Gamma-Ray Burst Monitor detection
DATE:    23/11/27 12:41:07 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU), 
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, 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 GRB 231125A (AstroSat CZTI detection: Waratkar et al.,  
GCN Circ 35190; Glowbug gamma-ray detection: Cheung et al.,
GCN Circ 35196) triggered the CALET Gamma-ray Burst Monitor 
(CGBM) at 17:47:20.53 UTC on 25 November 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1384969551/index.html).
The burst signal was seen by all CGBM detectors.  No real-time 
CGBM GCN notice was distributed about this trigger because
the real-time communication from the ISS was off (loss of signal).

The burst light curve shows a single pulse that starts
at T-0.19 sec, peaks at T+0.41 sec, and ends at T+1.60 sec.
The T90 and T50 durations measured by the SGM data are 
1.17 +/- 0.13 sec and 0.40 +/- 0.04 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1384969551/

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