Analysis of SB-1: (a) PDF for the posterior probabilities for all of the candidates with ﹩P\left({O}_{i}| x\right)\gt 0.01﹩. The PDF is nicely bimodal, with 96% having ﹩P\left({O}_{i}| x\right)\lt 10 \% ﹩ or ﹩P\left({O}_{i}| x\right)\gt 90 \% ﹩. (b) PDF of the maximum posterior for the 100,000 simulated FRBs. We find ≈35% of the sources has ﹩P\left({O}_{i}| x\right)\gt 0.95﹩, which we define as secure.