The Pierre Auger 2021 Open Data is the public release of 10% of the Pierre Auger Observatory data obtained with the world’s largest cosmic ray observatory.  The purpose of this release is to promote the use by a large and diversified community made up of researchers and citizens interested in raising awareness and scientific dissemination initiatives.

More details can be found at the website that hosts the datasets available from February 15, 2021 for download. Also available is an online event display to explore the released events, and example analysis codes are provided.