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Two recent papers\citep{xmri1, xmri2} revealed that in our Galaxy there arevery extreme-mass-ratio inspirals composed by brown dwarfs and the supermassiveblack hole at the center of the Galaxy. The event rates estimated in thesepapers are very considerable for future space-borne detectors. In addition,there are plunge events during the formation of inspiraling orbits. In thiswork, we calculate the gravitational waves from compact objects (brown dwarf,primordial black hole and etc.) plunging into or being scattered by the centralsupermassive black hole. We find that for space-borne detectors thesignal-to-noise ratios of these bursts are quite high. The event rates areestimated as $\sim$ $0.01 {\rm{yr}^{-1}}$ for the Galaxy. If we are lucky, thiskind of very extreme-mass-ratio bursts will offer a unique chance to reveal thenearest supermassive black hole and nuclei dynamics. The event rate can be aslarge as 4 $\sim$ 8 ${\rm yr^{-1}}$ in 10 Mpc, and because the signal is strongenough for observations by space-borne detectors, we have a good chance ofbeing able to probe the nature of neighboring black holes.

Very extreme mass-ratio bursts in the Galaxy and neighbouring galaxies in relation to space-borne detectors