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[July 2024, Athena] K. Toma and R. Matsui attended a forum on physics of gamma-ray bursts.

[Nov 2018, Nijmegen] K. Toma attended a meeting of Event Horizon Telescope Collaboration.

[Nov 2013, Matsushima] K. Toma attended a meeting on high-energy astrophysics.

[Okinawa] K. Toma's family line.