On Wednesday, September 30, Prof. Jocelyn Bell Burnell (Oxford University) will give a general-interest seminar at the APC laboratory. Registration at: https://indico.in2p3.fr/event/40486/

This discovery establishes the unusual binary system Cygnus X-3, located in the constellation Cygnus, as the highest-energy gamma-ray source known to date. LHAASO detected gamma-ray emission above 1 PeV with a statistical significance of 6.4 sigma. The highest-energy photon ever detected at Earth, with an energy of 3.7 PeV, originated from this source. The temporal variability and spectral properties measured by LHAASO provide strong evidence that Cygnus X-3 accelerates protons to energies of at least 30 PeV. These energies substantially exceed current theoretical expectations for Galactic particle accelerators.

On May 1, 2026, the European Commission approved ET-COMPASS, a Horizon Europe project with a budget of €1.5 million to support the Einstein Telescope as it moves into its implementation phase. Astrocent, a partner of the APC Laboratory, will lead the project’s international strategic communications.