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The lower energy thresholds of large wide-field gamma-ray observatories areoften determined by their capability to deal with the very low-energy cosmicray background. In fact, in observatories with areas of tens or hundreds ofthousands of square meters, the number of background events generated by thesuperposition of random, very low energy cosmic rays is huge and may exceed byfar the possible signal events. In this article, we argue that a triggerstrategy based on pattern recognition of the shower front can significantlyreject the background, keeping a good efficiency and a good angular accuracy(few square degrees) for gamma rays with energies as low as tens of GeV. Inthis way, alerts can be followed or emitted within time lapses of the order ofthe second, enabling wide-field gamma-ray observatories to better contribute toglobal multi-messenger networks of astrophysical observatories.

Identification of low energy neutral and charged cosmic ray events in large wide field observatorie