Distribution of GRBs per redshift bin (Δz = 0.25) for the events discussed in this paper compared to all LGRBs with a reported redshift estimate (indicated in gray; including all events before January 2017). A total of 40 bursts (blue) have a well-derived redshift estimate of z > 4; 24 (orange) of these have been observed with GROND, from which 21 (green) are analyzed in this paper.
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