Corner plots for the posterior distributions of the GEV parameters for data from the BATSE catalogue (top) and GBM catalogue (bottom). From the left to the right we have results for the duration, the peak flux and the fluence. The sampled parameters are the mean, μ, the scale, ϕ, and the shape, ξ of the GEV distribution. For the GBM dataset we carried out the analysis with or without the extreme GRB 221009A. The removal of this event affects only the GEV distributions for the fluence and peak flux.