Model discovery potential versus the number of GRBs in an optimised sub-sample, NGRB, for 3σ, 4σ, and 5σ in red solid, black dotted, and blue dashed lines. For each sub-sample, only the NGRB bursts with the best at the given trial factor NGRB are chosen. The thick lines show the distributions of the likelihood method used in this analysis, the thin lines show the distributions for a simple counting search with fixed quality cuts Λ > − 5.5, β < 1° (see text).
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