Multi-messengers at ultra-high energies with the Pierre Auger Observatory

Gravitational waves and the advent of multi-messenger astronomy

Open Access

Review

Figure 4

Upper limits on the integral photon flux for a photon flux E ⁻² and no background substraction. The limits set by the Pierre Auger Observatory with hybrid data (blue arrows) and SD data (black arrows) are compared to those obtained by other experiments and predictions for GZK photon flux and top–down scenarios. Taken from [46].

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