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During the pre-Swift era, a clustering of light curves was observed in theX-ray, optical and infrared afterglow of gamma-ray bursts. We used a sample of254 GRB X-ray afterglows to check this fact in the Swift era. We correctedfluxes for distance, time dilation and losses of energy due to cosmologicaleffects. With all our data in hand, we faced with a problem: our data werescattered. We investigated 3 possibilities to explain this, namely: theclustering does not exist, there are problems during calibration of data, andthere are instrumental problems. We finally confirm that our sample isconsistent with Dainotti correlation.

10 Years of XRT light curves: a general view of the X-ray afterglow