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We report the discovery of an extrasolar planet detected from the combineddata of a microlensing event OGLE-2015-BLG-0051/KMT-2015-BLG-0048 acquired bytwo microlensing surveys. Despite that the short planetary signal occurred inthe very early Bulge season during which the lensing event could be seen forjust about an hour, the signal was continuously and densely covered. From theBayesian analysis using models of the mass function, matter and velocitydistributions combined with the information of the angular Einstein radius, itis found that the host of the planet is located in the Galactic bulge. Theplanet has a mass $0.72_{-0.07}^{+0.65}\ M_{\rm J}$ and it is orbiting alow-mass M-dwarf host with a projected separation $d_\perp=0.73 \pm 0.08$ AU.The discovery of the planet demonstrates the capability of the currenthigh-cadence microlensing lensing surveys in detecting and characterizingplanets.

OGLE-2015-BLG-0051/KMT-2015-BLG-0048Lb: a Giant Planet Orbiting a Low-mass Bulge Star Discovered by High-cadence Microlensing Surveys