TITLE:   GCN CIRCULAR
NUMBER:  38563
SUBJECT: GRB 241213B: CALET Gamma-Ray Burst Monitor detection
DATE:    24/12/13 16:50:42 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

P. S. Marrocchesi (U of Siena), A. Yoshida, T. Sakamoto, S. Sugita,
Y. Kawakubo (AGU), 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),
and the CALET collaboration:

The GRB 241213B (MAXI/GSC detection: Negoro et al., GCN Circ. 
38555) was detected in the ground analysis of the CALET Gamma-ray 
Burst Monitor (CGBM) data around 12:56:30 on 13 December 2024 (referenced
to the MAXI detection: GCN Circ. 38555).
(https://cgbm.calet.jp/cgbm_trigger/flight/1418129753/index.html).
The burst signal was seen by all CGBM detectors.  

The burst light curve shows a single pulse that starts
at T+1.8 sec, peaks at T+2.4 sec, and ends at T+4.5 sec.
The T90 and T50 durations measured by the SGM data are 2.4 +/- 0.5 sec
and 1.2 +/- 0.4 sec (7-100 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1418129753/

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