  It has been widely accepted that relativistic effects have to be used for
modelling the wide classes of events associated with active galactic nuclei and
galactic superluminal sources. Here we propose a simple analytical model of
decelerated motion which is able to explain the shape of double-peaked light
curves of gamma-ray bursts. We show that the differences between individual
bursts of this class may be due to the angle between the line-of-sight and
direction of the outflow, and that the duration of the burst is intimately
connected with the deceleration parameter. Assuming special relativity formulae
and the orientation of the observer with respect to the outflow, we are able to
model observed double-peaked light curves and obtain good quality fits. We
propose that such smooth double peaked bursts could be produced by new born
galactic superluminal sources.
