TITLE: GCN CIRCULAR NUMBER: 38129 SUBJECT: GRB 241104A: CALET Gamma-Ray Burst Monitor detection DATE: 24/11/08 15:27:54 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University kawakubo@phys.aoyama.ac.jp

T. Tamura (Kanagawa U), 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 (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 241104A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 38075; Detection and localization by SVOM/ECLAIRs: Schanne et al., GCN Circ. 38078; EP detection of GRB 241104A X-ray emission: Zhou et al., GCN Circ. 38081; SVOM/GRM observation: Zhang et al., GCN Circ. 38082) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 18:30:15.957 UTC on 04 November 2024 (https://cgbm.calet.jp/cgbm_trigger/flight/1414780091/index.html). The burst signal was seen by only the SGM detector. Because of a problem with the ground alert processing script, the GCN notice was not distributed automatically for this event.

The burst light curve shows a multi-peaked structure that starts at T-0.6 sec, peaks at T+2.6 sec, and ends at T+5.1 sec. The T90 and T50 durations measured by the SGM data are 5.0 +/- 0.4 sec and 3.3 +/- 0.5 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1414780091/

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

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