Evidences of the central engine activity in the Naked-Eye Burst prompt optical emission

S. Karpov1*, G. Beskin1, S. Bondar2, A. Guarnieri3, C. Bartolini3, G. Greco4, and A. Piccioni3
1Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Russia
2Institute for Precise Instrumentation, Nizhnij Arkhyz 369167, Russia
3Astronomy Department of Bologna University, Bologna, Italy
4Astronomical Observatory of Bologna, INAF, Italy

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Abstract

Naked-Eye Burst is the only event to date observed in optical and gamma-ray energies simultaneously with sufficiently high temporal resolution. This opens unprecedented possibilities for testing various models of both emission generation and the central engine behaviour during the burst. The temporal properties of the observed light curve, along with tight optical to gamma relation, suggest the intrinsic periodicity of internal engine, which is supposedly a newborn stellar-mass compact object surrounded by an unstable precessing massive accretion disk.

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Keywords : gamma-ray bursts: individual (GRB 080319B).