Significance of the selected sample of 13 MGF candidates. Ω is a ranking statistic representing the believability that a given burst is a giant flare based on 3D spatial agreement with cataloged galaxies, as described in Burns et al. (2021). The red line indicates the 13 MGF candidates, and the black line represents the background distribution of GRBs. The green-shaded regions represent the 1, 2, 3, and 4σ two-sided confidence intervals. There is a single event outlier at 3.3σ significance: GRB 180128A.