Correlation plots of the bulk Lorentz factor Γ₂ = Γ/10² (a) and luminosity L_iso, 52 = L_iso/10⁵² erg s⁻¹ (b) with the photon energy peak in the rest frame E_{γ,peak,300,rest} for the prompt emission, useful for the catalog of the GRB prompts. The best exponential fit is shown as a dashed line, with the 3σ error bands represented by the blue, shaded regions. GRB data are taken from Ghirlanda et al. (2018), (a) and Yonetoku et al. (2010), (b).