Distribution of GRB properties measured by Swift/XRT. Green represents the whole Swift/XRT population, while blue represents those observed by H.E.S.S. Black lines represent the individual measurements for all GRBs detected at VHE and by Swift/XRT, except for GRB 190829A, which is represented with the orange arrow. Top-left plot shows the distribution of the T₉₀ parameters, and the top-right shows the overall fluence of the burst. The two orange arrows for GRB 190829A in the bottom right panel correspond to the second and first night of H.E.S.S. observations in that order.