Pierre Auger Observatory

Spectral Calibration of the Fluorescence Telescopes of the Pierre Auger Observatory

To estimate the energy of any cosmic ray event detected by the Pierre Auger Observatory, the detectors have to be calibrated.


The Pierre Auger, ANTARES, and IceCube Observatories team up for a search of neutrino emission from the binary neutron star merger GW170817

On August 17, 2017 the LIGO and Virgo collaboration measured a gravitational wave originating from a binary neutron star merger. Within 1.7 seconds, this event was followed by a gamma ray burst (GRB), recorded by the Fermi and INTEGRAL satellites, and subsequent electromagnetic observations in the optical and radio regimes. These observations made it possible for the first time to pinpoint the source location of a gravitational wave event. The source was found to be in a galaxy 130 million light years away, known as NGC 4993. According to model predictions such a system may also accelerate cosmic rays to extreme energies, and thus emit photons and neutrinos up to GeV to EeV energies.


50 year-old mystery has been solved

Ever since the existence of cosmic rays with individual energies of several Joules was established in the 1960s, speculation has raged as to whether cosmic particles of mean energy of 2 Joules are created in our Milky Way or in distant extragalactic objects.