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A bright γ-ray flare interpreted as a giant magnetar flare in NGC 253

Mitrofanov, I.; Hurley, K.; von Kienlin, A. +33 more

Soft γ-ray repeaters exhibit bursting emission in hard X-rays and soft γ-rays. During the active phase, they emit random short (milliseconds to several seconds long), hard-X-ray bursts, with peak luminosities¹ of 10³⁶ to 10⁴³ erg per second. Occasionally, a giant flare with an energy of around 10⁴⁴ to 10…