Laurie W drew attention to the OMG particle (320EeV) and here is a runner-up (240EeV):
https://www.nature.com/articles/d41586-023-03677-0
Reminder 10^18 eV = 1 EeV. Sorry to outsiders, but OLD SUGARites like to reminisce. Unfortunately I've forgotten what SUGAR max claim is on its closing, but in my day I used 67 events over 5EeV for direction analysis. Ah, such confidence in the accuracy of the chosen structure function in those days! Errors need expression in orders of magnitude. Say no more.
Naturally, the article suggests unknown physical processes involved - they should leave that to the speculations of the OLD Cosgrays.
--TonyP
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