7.5.5. *L*–*T*–*E* Correlation

As already stated, this correlation shares similarities with the Combo correlation but, unlike it, needs to be corrected for the redshift evolution effects [142].

The *L*–*T*–*E* correlation, as well as the Combo correlation, may be explained within the magnetar scenario, which justifies the plateau phase observed in the X-ray afterglow light curves as due to the continuous energy supply from a supra-massive NS (see Section 3.1.3 and Ref. [71], for details).

Like the Combo correlation, which shares similar features, the same discussion on the biases and selection effects holds for the *L*–*T*–*E* correlation as well. In addition, in Ref. [142], it is shown that GRBs of the sample at high redshifts usually have relatively larger *L*<sup>X</sup> and *E*iso. This is very likely a selection effect due to the fact that very distant GRBs with small *L*<sup>X</sup> and *E*iso cannot be observed in view of the limited threshold of current detectors.
