The 9th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy (γ-2026) will take place from August 31 to September 4 2026, in Heidelberg, Germany.
The Gamma-Ray Symposium has been held since 1994 in Heidelberg (see previous editions in 2000, 2004, 2008, 2012, 2016), with the last two symposia taking place in Barcelona (2022) and Milan (2024). We are glad to announce that the 2026 edition will again be held in Heidelberg at the Neue Universität in the heart of the historical old town, hosted by MPIK and Heidelberg University. The format will closely follow that of previous symposia, covering all major observational and theoretical aspects of the field with a focus on the high-energy (GeV), very-high-energy (TeV), and ultra-high-energy (>100 TeV) intervals of the electromagnetic spectrum.
Emphasis will be placed on recent advances in the field, in areas including microquasars, extragalactic jets and transients, the acceleration of cosmic rays, PeV sources, and progress in understanding diffuse emission. Major progress on new facilities, upgrades, instrumentation, and techniques will be reported. Synergies with other wavebands and messengers, including X-rays, radio, neutrinos, and gravitational waves are expected to be a strong theme of the symposium. The symposium will also address cosmological issues related to dark matter, intergalactic radiation and magnetic fields, as well as topics in fundamental physics.
