TITLE:   GCN CIRCULAR
NUMBER:  35228
SUBJECT: GRB 231129C: CALET Gamma-Ray Burst Monitor detection
DATE:    23/11/30 06:11:11 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

Y. Shimizu (Kanagawa U), 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),
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 231129C (Fermi GBM Final Real-time Localization: Fermi GBM team,
GCN Circ. 35217; Fermi GBM detection: Sharma at al., GCN Circ. 35221; BALROG 
localization: Preis et al., GCN Circ 35222; MAXI/GSC detection: Kawakubo et al., 
GCN Circ. 35223) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 
19:10:15.03 UTC on 29 November 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1385320118/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse that starts
at T+3.1 sec, peaks at T+4.7 sec, and ends at T+8.9 sec.
The T90 and T50 durations measured by the SGM data are 4.7 +/- 0.4 sec
and 2.2 +/- 0.2 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1385320118/index.html

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