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In order to test the efficacy of Gamma-ray Bursts (GRBs) as cosmological probes, we the characterize the scatter in the correlations between six pairs of GRB related observables, which have previously also been studied in arXiv:2011.14040. However, some of these observables depend on the luminosity distance, for which one needs to assume an underlying cosmological model. In order to circumvent this circularity problem, we use X-ray and UV fluxes of quasars as distance anchors to calculate the luminosity distance in a model-independent manner, which in turn gets used to calculate the GRB-related quantities. We find that all the six pairs of regression relations show a high intrinsic scatter for both the low and high redshift sample. This implies that these GRB observables cannot be used as model-independent cosmological probes.
Purohit et al. (Tue,) studied this question.