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Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20

Katsuaki Asano·Ryo Yamazaki·Naoshi Sugiyama
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Abstract

On 2004 December 27, a giant flare from the soft gamma repeater 1806$-$20 was observed. The radiation mechanism of the initial peak of the flare would be controversial. In this letter we point out that very high-energy cosmic rays would be produced in the case that the flare was caused by internal shocks, as is usually considered for gamma-ray bursts. The highest energy of cosmic rays can reach $10^{19}$ eV, if the Lorentz factor of the shocks is sufficiently high. Future observations of cosmic rays will inform us about the mechanism of the giant flare.

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Katsuaki Asano, Ryo Yamazaki, Naoshi Sugiyama. 2006-01-10. Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20. https://doi.org/10.1093/pasj%2F58.1.l7

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