TITLE: GCN CIRCULAR NUMBER: 40932 SUBJECT: GRB 250702A: CALET Gamma-Ray Burst Monitor detection DATE: 25/07/04 04:55:55 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University kawakubo@phys.aoyama.ac.jp
K. Kobayashi (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, (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 250702A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 40881; BALROG localization: Preis et al., GCN Circ 40882; Fermi GBM Detection: Malacaria et al., GCN Circ. 40887; GECAM-B detection: Wang et al., GCN Circ. 40992) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 09:54:05.81 UTC on 2 July 2025 (https://cgbm.calet.jp/cgbm_trigger/flight/1435484973/index.html). The burst signal was seen by all CGBM detectors.
The burst light curve shows a single pulse that starts at T+1.5 sec, peaks at T+6.2 sec, and ends at T+14.4 sec. The T90 and T50 durations measured by the SGM data are 10.5 +/- 0.6 sec and 3.9 +/- 0.3 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1435484973
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
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