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We report the discovery of a planet by the microlensing method,OGLE-2012-BLG-0724Lb. Although the duration of the planetary signal for thisevent was one of the shortest seen for a planetary event, the anomaly was wellcovered thanks to high cadence observations taken by the survey groups OGLE andMOA. By analyzing the light curve, this planetary system is found to have amass ratio $q=(1.58\pm0.15)\times10^{-3}$. By conducting a Bayesian analysis,we estimate that the host star is an M-dwarf star with a mass of $M_{\rmL}=0.29_{-0.16}^{+0.33} \ M_{\odot}$ located at $D_{\rm L}=6.7_{-1.2}^{+1.1} \{\rm kpc}$ away from the Earth and the companion's mass is $m_{\rmP}=0.47_{-0.26}^{+0.54} \ M_{\rm Jup}$. The projected planet-host separation is$a_{\perp}=1.6_{-0.3}^{+0.4} \ {\rm AU}$. Because the lens-source relativeproper motion is relatively high, future high resolution images would detectthe lens host star and determine the lens properties uniquely. This system islikely a Saturn-mass exoplanet around an M-dwarf and such systems are commonlydetected by gravitational microlensing. This adds an another example of apossible pileup of sub-Jupiters $(0.2 < m_{\rm P}/M_{\rm Jup} < 1)$ in contrastto a lack of Jupiters ($\sim 1 - 2 \ M_{\rm Jup}$) around M-dwarfs, supportingthe prediction by core accretion models that Jupiter-mass or more massiveplanets are unlikely to form around M-dwarfs.

OGLE-2012-BLG-0724Lb: A Saturn-mass Planet around an M-dwarf