TITLE: GCN CIRCULAR NUMBER: 36719 SUBJECT: GRB 240619A: CALET Gamma-Ray Burst Monitor detection DATE: 24/06/21 07:03:46 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University kawakubo@phys.aoyama.ac.jp
S. Torii (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), 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 240619A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 36694; BALROG localization: Preis et al., GCN Circ. 36695; Fermi GBM Observation: Dalessi et al., GCN Circ. 36717) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 03:43:30.40 UTC on 19 June 2024 (https://cgbm.calet.jp/cgbm_trigger/flight/1402803348/index.html). The burst signal was seen by all CGBM detectors.
The burst light curve shows a double-peaked structure that starts at T+0.6 sec, peaks at T+1.1 sec, and ends at T+37.4 sec. The T90 and T50 durations measured by the SGM data are 35.0 +/- 1.3 sec and 28.5 +/- 1.1 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1402803348/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
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