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We carry out a search for signatures of cosmological time dilation in thelight curves of Gamma Ray Bursts (GRBs), detected by the Neil Gehrels SwiftObservatory. For this purpose, we calculate two different durations ($T_{50}$and $T_{90}$) for a sample of 247 GRBs in the fixed rest frame energy intervalof 140-350 keV, similar to Zhang et al. We then carry out a power law-basedregression analysis between the durations and redshifts. This search is doneusing both the unbinned as well as the binned data, where both the weightedmean and the geometric mean was used. For each analysis, we also calculate theintrinsic scatter to determine the tightness of the relation. We find thatweighted mean-based binned data for long GRBs and the geometric mean-basedbinned data is consistent with the cosmological time dilation signature,whereas the analyses using unbinned durations show a very large scatter. Wealso make our analysis codes and the procedure for obtaining the light curvesand estimation of $T_{50}$/$T_{90}$ publicly available.

Search for Cosmological time dilation from Gamma-Ray Bursts -- A 2021 status update