ИСТИНА

Recently several types of radiotransients have been discovered. Such sources are of special interest now as we are entering the era of sky monitoring in radio waves. In this contribution we focus on two classes of transients. In 2007 Lorimer et al. \cite{l07} discovered the first millisecond extragalactic radio burst. In 2013 Thornton et al. \cite{t13} presented observations of four bursts of this type, thus confirming the existence of such class of transient phenomena. Several explanations have been suggested. We focus on our idea \cite{pp07, pp13} that the bursts are related to hyper flares of magnetars. Recently this proposal got support in the detailed study by Kulkarni et al. \cite{k14}. The work by Lyubarsky \cite{l14} contains a theoretical description of a mechanism of radio emission of such bursts. We demonstrate that from the point of view of statistics, energetics etc. magnetar bursts at the moment are the best candidates to explain millisecond extragalactic radio bursts. In 2005 Hyman et al. \cite{h05} discovered a radio transient in the direction of the Galactic center GCRT J1745-3009. This source demonstrated several flares in few years. We discuss several mechanisms related to different types of isolated and binary neutron stars to explain these observations (see some early results in \cite{p08}). Namely, a highly magnetized neutron star on a propeller or a georotator stage, a transient propeller, and an ejector in a binary system are discussed. Simple populational estimates favor the transient propeller model.