TITLE: GCN CIRCULAR NUMBER: 34849 SUBJECT: GRB 231018A: CALET Gamma-Ray Burst Monitor detection DATE: 23/10/20 04:35:30 GMT FROM: Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu> P. S. Marrocchesi (U of Siena), 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), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), and the CALET collaboration: The long GRB 231018A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 34826; BALROG localization: Preis et al., GCN Circ 34827; Fermi GBM Detection: Lesage et al., GCN Circ 34831; IPN triangulation: Svinkin et al., GCN Circ 34845; Konus-Wind detection: Frederiks et al., GCN Circ 34846; Glowbug gamma-ray detection: Cheung et al., GCN Circ 34847) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 12:30:52.87 UTC on 18 October 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1381667434/index.html). The burst signal was seen by only the SGM detector. The burst light curve shows a multi-peaked structure that ends T+46 sec. Since CGBM was in the HV-on sequence, the whole episode was not observed by CGBM. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1381667434/ 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/34849. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...