TITLE: GCN CIRCULAR NUMBER: 36046 SUBJECT: GRB 240402C: CALET Gamma-Ray Burst Monitor detection DATE: 24/04/07 08:07:31 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp> Y. Asaoka (ICRR), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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 long GRB 240402C (GRBAlpha detection: Dafcikova et al., GCN Circ. 36036; Glowbug gamma-ray detection: Cheung et al., GCN Circ. 36038) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 05:30:42.49 UTC on 2 April 2024 (http://cgbm.calet.jp/cgbm_trigger/flight/1396070722/index.html). The burst signal was seen by all CGBM detectors. The burst light curve shows a double-peaked structure that starts at T-62.6 sec, peaks at T+1.6 sec, and ends at T+21.1 sec. The T90 and T50 durations measured by the SGM data are 76.5 +/- 2.6 sec and 53.5 +/- 1.0 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1396070722/index.html 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/36046. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...