  We calculate low-frequency gyrotropic spin excitation modes of the skyrmion
ground state ultrathin cylindrical magnetic dots. The skyrmion is assumed to be
stabilized at room temperature and zero external magnetic field due to an
interplay of the isotropic and Dzyaloshinskii-Moriya exchange interactions,
perpendicular magnetic anisotropy and magnetostatic interaction. We consider
Bloch- and Neel-type magnetic skyrmions and assume that the dot magnetization
does not depend on the thickness coordinate. The skyrmion gyrotropic
frequencies are calculated in GHz range as a function of the skyrmion
equilibrium radius, dot radius and the dot magnetic parameters. Recent
experiments on magnetic skyrmion gyrotropic dynamics in nanodots are discussed.
