Left: distribution of likelihoods (given by exp(−ℒ_*), ℒ_* being the negative log-likelihood) for GRBs from sample S_IInz. Vertical lines show the values of S₀ candidates. Right: histogram of exp( − ℒ_*^(tot)), where ${{\mathcal{L}}_{\ast }}^{(\mathrm{tot})}={\displaystyle \sum _{i=1}^9}{{\mathcal{L}}_{\ast }}^{(i)}$ obtained from 10⁶ realisations of random selection of 9 GRBs from S_IInz (Sec. 2.3). The vertical blue line shows the value obtained from the sample S₀, $exp(-{\mathcal{L}}_{\ast ,S_0}^{(\mathrm{tot})})$. The fraction of simulations for which is it ${\mathcal{L}}_{\ast }^{(\mathrm{tot})}\ge {\mathcal{L}}_{\ast ,S_0}^{(\mathrm{tot})}$ is the joint probability that all 9 GRBs from S₀ are consistent with the E_p, i − E_iso for type-II GRBs. This fraction turns out to be 1.2 × 10⁻⁴, equivalent to 3.7σ (Gaussian).