Abstract
In a recent paper by Ruderman and Cheng (1988) a general scenario of radio pulsars evolution has been proposed, which explains jointly all galactical classes of neutron stars (NSs) radiating gamma-rays. This scheme associates cosmic gamma-ray bursts (GRBs) with electromagnetic cascades in magnetosphere of dead pulsars. Due to re-ignition processes in outer gaps, rotation energy of the NS was thought to convert to gamma-rays, but possible ‘matches’ for re-ignition has not been pointed out. The passage of interstellar comet through the magnetosphere of ‘dead’ pulsars is proposed below as a possible initiator of the GRBs. Values of the main parameters of the model (period of the NS rotation, concentration of interstellar comets and fraction of bursting NSs) are estimated, thus allowing to explain general characteristics of the phenomenon of the GRBs.
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