7.4.2. *L* iso–*V* Correlation

This correlation has a non-negligible scatter; thus, it is the least reliable one among all GRB prompt emission correlations [130]. The physical origin of the *L*iso–*V* correlation is still unclear. Within the internal shock scenario (see Section 3.1.2), it seems to be related to the activity of the central engine through the values of Γ and the jet-opening angles [150] and, based on this interpretation, *L*iso (*V*) is proportional to a high (low) power of Γ, hence high-luminosity pulses imply high variability prompt light curves [145].

As discussed above for the *L*iso–*τ*lag correlation, the luminosity–variability correlation as well is severely plagued by sample incompleteness [149].
