Abstract
More than 13 years after the discovery of the first afterglows, the nature of dark gamma‐ray bursts (GRB) has still eluded explanation: while each long‐duration GRB typically has an X‐ray afterglow, optical/NIR emission is only seen for 40–60% of those. Here we use the afterglow detection statistics of the systematic follow‐up observations performed with GROND since mid‐2007 in order to derive the fraction of “dark bursts”. We find that the faint optical afterglow emission of “dark bursts” is due to a combination of two components: (i) moderate intrinsic extinction at moderate redshifts, and (ii) about 25% of bursts at redshift >5.
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