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BICEP3 is a $550~mm$ aperture telescope with cold, on-axis, refractive opticsdesigned to observe at the $95~GHz$ band from the South Pole. It is the newestmember of the BICEP/Keck family of inflationary probes specifically designed tomeasure the polarization of the cosmic microwave background (CMB) atdegree-angular scales. BICEP3 is designed to house 1280 dual-polarizationpixels, which, when fully-populated, totals to $\sim$9$\times$ the number ofpixels in a single Keck $95~GHz$ receiver, thus further advancing theBICEP/Keck program's $95~GHz$ mapping speed. BICEP3 was deployed during theaustral summer of 2014-2015 with 9 detector tiles, to be increased to its fullcapacity of 20 in the second season. After instrument characterizationmeasurements were taken, CMB observation commenced in April 2015. Together withmulti-frequency observation data from Planck, BICEP2, and the Keck Array,BICEP3 is projected to set upper limits on the tensor-to-scalar ratio to $r$$\lesssim 0.03$ at $95\%$ C.L..

Initial Performance of BICEP3: A Degree Angular Scale 95 GHz Band Polarimeter