TITLE: GCN CIRCULAR NUMBER: 35639 SUBJECT: GRB 240125A: CALET Gamma-Ray Burst Monitor detection DATE: 24/01/27 00:35:22 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 short GRB 240125A (Glowbug gamma-ray detection: Cheung et al., GCN Circ. 35630; AstroSat CZTI detection: Joshi et al., GCN Circ. 35637) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 09:34:58.79 UTC on 25 January 2024 (http://cgbm.calet.jp/cgbm_trigger/flight/1390210300/). The burst signal was seen by all CGBM detectors.
The burst light curve shows a triple-peaked structure that starts at T+0.50 sec, peaks at T+1.02 sec, and ends at T+1.65 sec. The T90 and T50 durations measured by the SGM data are 1.10 +/- 0.05 sec and 0.65 +/- 0.11 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1390210300/index.html
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
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