The nature of ``dark'' gamma-ray bursts

Details The nature of ``dark'' gamma-ray bursts The nature of ``dark'' gamma-ray bursts

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279..144g&link_type=abstract

DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 144-151 (2010).

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Gamma-Ray Sources (Astronomical), Cosmology, Photometry, X-Ray Spectra, Gamma-Ray Sources, Gamma-Ray Bursts, Particle-Theory And Field-Theory Models Of The Early Universe, Photometric, Polarimetric, And Spectroscopic Instrumentation, X-Ray

Scientific paper

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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