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We report the discovery of an annular emission of $\sim$3'-9' radius aroundthe center of a transient source, an X-ray burster MAXI J1421-613, in theSuzaku follow-up analysis. The spectrum of the annular emission shows nosignificant emission-line structure, and is well explained by an absorbed powerlaw model with a photon index of $\sim$4.2. These features exclude thepossibility that the annular emission is a shell-like component of a supernovaremnant. The spectral shape, the time history, and the X-ray flux of theannular emission agree with the scenario that the emission is due to adust-scattering echo. The annular emission is made under a rare condition ofthe dust-scattering echo, where the central X-ray source, MAXI J1421-613,exhibits a short time outburst with three X-ray bursts and immediatelyre-enters a long quiescent period. The distribution of the hydrogen columndensity along the annular emission follows that of the CO intensity, whichmeans that MAXI J1421-613 is located behind the CO cloud. We estimate thedistance to MAXI J1421-613 to be $\sim$3~kpc assuming that the dust layerresponsible for the annular emission is located at the same position as the COcloud.

Discovery of annular X-ray emission centered on MAXI J1421-613: Dust-scattering X-rays?