  We speculate that the universe is filled with stars composed of
electromagnetic and dilaton fields which are the sources of the powerful
gamma-ray bursts impinging upon us from all directions of the universe. We
calculate soliton-like solutions of these fields and show that their energy can
be converted into a relativistic plasma in an explosive way. As in classical
detonation theory the conversion proceeds by a relativistic self-similar
solution for a spherical detonation wave which extracts the energy from the
scalar field via a plasma in the wave front.
