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2012

A doublet of cosmic-ray events with primary energies >10^20 eV

Troitsky, S. V.

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The Telescope Array Collaboration has observed a cosmic-ray event with estimated primary energy of 1.38*10^20 eV whose arrival direction coincides (see arxiv:1205.5984), given the angular resolution of 1.5 deg, with that of an event with estimated primary energy of 1.23*10^20 eV observed by the Pierre Auger Observatory.

The total number of events with energies >10^20 eV published by both experiments is six.
I estimate the statistical significance of the doublet, which is rather weak, and point out that the arrival directions of events in the doublet coincide with the Galactic X-ray source Aql X-1.

A doublet of cosmic-ray events with primary energies >10^20 eV · Around

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