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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.