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Workshop for the Global Cosmic Ray Observatory -- Challenging Next-Generation Multi-Messenger Astronomy with Interdisciplinary Research

9–11 Sept 2025
University of Tokyo
Asia/Tokyo timezone

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Session

Opening and lesson learned from current multi-messenger astronomy (Convener: Toshihiro Fujii)

9 Sept 2025, 10:00
Koshiba Hall, Hongo Campus (University of Tokyo )

Koshiba Hall, Hongo Campus

University of Tokyo

7-3 Hongo Bunkyo-ku Tokyo 113-0033 Jpan

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  1. 29. The Global Cosmic Ray Observatory (GCOS) – Status and Perspectives
    Jörg Hörandel
    09/09/2025, 10:00
    Invited

    In this introductory talk, we will provide an overview of the past and present activities of the Global Cosmic Ray Observatory (GCOS) and offer a look ahead to the future. Where do we currently stand, and where do we want to go in the coming years? What challenges lie ahead, and what could be the next steps on our path forward?

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  2. 17. Declination Dependence in the Cosmic Ray Energy Spectrum
    Jihyun Kim (Osaka Metropolitan University)
    09/09/2025, 10:30
    Oral

    The Telescope Array (TA), the largest ultra-high-energy cosmic ray (UHECR) observatory in the Northern Hemisphere, continues to deliver precise measurements of the cosmic ray energy spectrum, thanks to its stable performance and high data acquisition efficiency. These observations have revealed three prominent spectral features, commonly referred to as the ankle, shoulder, and cutoff, which...

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  3. 7. SWGO: future perspective in the multi-messenger era
    Alessio Porcelli (Universidad de Antofagasta)
    09/09/2025, 10:50
    Invited

    To understand the Universe at the High-Energy scale of astronomy, observation must rely on all messengers: Gamma rays, Cosmic Rays, Neutrinos, and the recent Gravitational Waves. This multi-messenger approach requires the effort of many experiments worldwide, each optimized for one of the messengers. The Southern Wide-field Gamma-ray Observatory, SWGO, is a gamma-ray one.

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  4. 22. A new air shower array in the Southern Hemisphere looking for the origins of Cosmic rays: the ALPACA experiment
    Dr Marcos Anzorena (ICRR, The University of Tokyo)
    09/09/2025, 11:20
    Oral

    In 2019 the Tibet ASγ collaboration reported the detection of sub-PeV γ-
    rays coming from the Crab nebula using a novel technique with a Surface Array and underground water Cherenkov muon detector to discriminate against hadrons. With the same idea, we are now building a new experiment to explore the gamma-ray sky in the Southern
    Hemisphere looking for the origins of cosmic rays in our...

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  5. 33. Multi-messenger astronomy with IceCube
    Dr Koji Noda (Chiba University)
    09/09/2025, 11:40
    Invited

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