Photon search paper published

A paper of the Pierre Auger Collaboration about the search for photons with energies above $2\times10^{17} \, \text{eV}$, with major contributions from the Siegen Auger group, was recently published in The Astrophysical Journal. The now published results represent the strictest upper bounds on the integral flux of photons in the sub-EeV region.

Paper (Open Access): The Pierre Auger Collaboration, A search for photons with energies above $2\times10^{17} \, \text{eV}$ using hybrid data from the low-energy extensions of the Pierre Auger Observatory, The Astrophysical Journal, 933 (2022) 125 .