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AboutThe Global Cosmic Ray Observatory - GCOS is an intended next-generation observatory to measure the properties of the highest-energy particles in the Universe with unprecedented precision after the year 2030.At present, the largest detector for cosmic rays is the Pierre Auger observatory in Malargüe, Argentina, covering an area of 3000 km2. To increase its sensitivity to the type of particle, at present, additional components are being installed at the observatory. In the northern hemisphere the Telescope Array , located in Utah, USA, is covering an area of 700 km2, presently undergoing an extension to cover about 2800 km2. Objective of these installations is to measure the properties of ultra high-energy cosmic rays with unprecedented precision in the next decade (until about 2035). Key properties include the arrival direction (on the sky), the energy, and the particle type. The flux of particles provided by Nature at the highest energies is small and to address the physics questions, a new facility is needed after 2030 with an acceptance at least an order of magnitude larger than the existing observatories. UHECR White PaperThe physics case of GCOS is outlined in a recent UHECR White Paper.GCOS White PaperDetails on the science case and ideas about the instrumental implementation are given in the GCOS White Paper.GCOS workshop September 2025Aim of the workshop is to further advance our plannings towards the Global Cosmic Ray Observatory - GCOS. The workshop will be hosted at the University of Tokyo (Tokyo, Japan).More information on the workshop is available on the Workshop INDICO page.
GCOS email listIf you are interested in the GCOS project and you want to contribute to it or follow our progress, please sign up to our email list.
For more information, please contact
Jörg R. Hörandel
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