Cumulative distribution of the basic properties of the GRBs at z > 4. Shown are the galactic foreground reddening EB−V and hydrogen column density NH, as well as the duration of the prompt emission T90 and the time of the first GROND observation TGROND. With two exceptions, all GRBs are behind modest galactic dust and hydrogen column densities (left panels). The value T90 is between 2 and 300 s for all of the GRBs with the only outliner being GRB 140614A with 720 s (top right panel). The majority of the GRBs were observed by GROND between 4 to 18 h after the trigger; only 6 are part of the unbiased GROND 4h sample (Greiner et al. 2011) (bottom right panel).
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