  We report the discovery of an extrasolar planet detected from the combined
data of a microlensing event OGLE-2015-BLG-0051/KMT-2015-BLG-0048 acquired by
two microlensing surveys. Despite that the short planetary signal occurred in
the very early Bulge season during which the lensing event could be seen for
just about an hour, the signal was continuously and densely covered. From the
Bayesian analysis using models of the mass function, matter and velocity
distributions combined with the information of the angular Einstein radius, it
is found that the host of the planet is located in the Galactic bulge. The
planet has a mass $0.72_{-0.07}^{+0.65}\ M_{\rm J}$ and it is orbiting a
low-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 current
high-cadence microlensing lensing surveys in detecting and characterizing
planets.
