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Naked-Eye Burst is the only event observed in optical and gam m -ray ranges simultaneously with sufficiently high temporal resolution. This opens unpr ecedented possibilities for testing various models of both emission generation and the central e ngin behaviour during the burst. The temporal properties observed, along with tight optical o gamma relation, suggest the intrinsic periodicity of internal engine, which is supposedly a newbo rn stellar-mass black hole surrounded by an unstable precessing massive accretion disk.

Variability of the Naked-Eye Burst prompt optical emission as a manifestation of its central engine periodic activity.