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The Keck Array is a system of cosmic microwave background (CMB) polarimeters,each similar to the BICEP2 experiment. In this paper we report results from the2012 and 2013 observing seasons, during which the Keck Array consisted of fivereceivers all operating in the same (150 GHz) frequency band and observingfield as BICEP2. We again find an excess of B-mode power over thelensed-$\Lambda$CDM expectation of $> 5 \sigma$ in the range $30 < \ell < 150$and confirm that this is not due to systematics using jackknife tests andsimulations based on detailed calibration measurements. In map difference andspectral difference tests these new data are shown to be consistent withBICEP2. Finally, we combine the maps from the two experiments to produce finalQ and U maps which have a depth of 57 nK deg (3.4 $\mu$K arcmin) over aneffective area of 400 deg$^2$ for an equivalent survey weight of 250,000$\mu$K$^{-2}$. The final BB band powers have noise uncertainty a factor of 2.3times better than the previous results, and a significance of detection ofexcess power of $> 6\sigma$.

BICEP2 / Keck Array V: Measurements of B-mode Polarization at Degree Angular Scales and 150 GHz by the Keck Array