Program: GN-2016B-DD-2

FRB 121102 is the only known repeating source in the class of mysterious phenomena known as Fast Radio Bursts (FRBs). Through our very recent VLA campaign, we have *direct* sub-arcsecond localization of FRB 121102, the first for any FRB. At the location of the burst, VLA and EVN observations show a potentially variable radio point source and archival Keck imaging shows a faint (R = 24.5 mag), possibly extended object with extremely low chance coincidence probabilities (P<0.005). This concrete association is an unprecedented opportunity to learn about the yet unknown origins of FRBs, their distance scales, and host properties. At this juncture, the host identification and redshift measurement are the most important details for FRB science and ones that can only be achieved via optical imaging and spectroscopy. We are requesting a 6.9 hr DDT Gemini GMOS-N observation to provide the linchpin to an extensive multiwavelength campaign.