Astronomers using the H.E.S.S. telescopes have discovered the first ever modulated signal from space in Very High Energy Gamma Rays – the most energetic such signal ever observed. Regular signals from space have been known since the 1960s, when the first radio pulsar was discovered. This is the first time a signal has been seen at such high energies – 100.000 times higher than previously known – and is reported in the Journal „Astronomy and Astrophysics“.

https://www.mpi-hd.mpg.de/hfm/HESS/pages/press/old/PressRelease/LS5039Press-2006/PressRelease_E.html