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. View this GCN Circular online at https://gcn.nasa.gov/circulars/38563. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...