1.1 Primary Objective & Hypothesis Determine the safety and tolerability of SBRT followed by nivolumab or ipilimumab with nivolumab for hepatocellular carcinoma by establishing the rates of toxicity that occur within 6 months from start of SBRT. Hypothesis: SBRT followed by nivolumab or nivolumab and ipilimumab will have similar toxicity to historical controls of SBRT or nivolumab monotherapy.