TITLE: GCN CIRCULAR NUMBER: 42252 SUBJECT: GRB 251013A: CALET Gamma-Ray Burst Monitor detection DATE: 25/10/14 11:06:25 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp> S. Sugita, A. Yoshida, T. Sakamoto, 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), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The GRB 251013A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 42213; SVOM/GRM observation: Wang et al., GCN Circ. 42218) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 08:04:04.90 UTC on 13 October 2025 (https://cgbm.calet.jp/cgbm_trigger/flight/1444377382/index.html). The burst signal was seen by only the SGM detector. The burst light curve shows a single pulse that starts at T+0.55 sec, peaks at T+1.32 sec, and ends at T+1.85 sec. The T90 and T50 durations measured by the SGM data are 1.20 +/- 0.16 sec and 0.50 +/- 0.11 sec (40-1000 keV), respectively. The ground-processed light curve is available at https://cgbm.calet.jp/cgbm_trigger/ground/1444377382/ 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/42252. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...