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Maxim Barkov and Alexei Pozanenko, Model of the extended
emission of short gamma-ray bursts, Mon. Not. R. Astron.
Soc. 417, 2161 (2011).
The existence of extended emission (EE) is an
intriguing property of short-duration gammaray bursts,
because the nature of the EE is still unclear. It might be a rising X-ray
afterglow, or it could be a manifestation of the prolonged activity of a
central engine. We consider short duration gamma-ray bursts, emphasizing the
common properties of both short bursts and short bursts with EE. Assuming that
the EE with broad dynamic range is a common property of short bursts, we
propose a two jet model which can describe both short main episode of hard spectra
emission, specific for short bursts, and softer spectra EE by different off
axis position of observer. The model involves a short-duration jet, which is
powered by heating due to νν' annihilation,
and a long-lived Blandford-Znajek jet with a
significantly narrow opening angle. Our proposed model is a plausible mechanism
for short-duration burst energization. It can explain
short bursts both with and without EE within a single class of progenitor.