The nature of dark gamma-ray bursts

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

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1358..121g&link_type=abstract

GAMMA RAY BURSTS 2010. AIP Conference Proceedings, Volume 1358, pp. 121-124 (2011).

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X-Ray Sources (Astronomical), Redshift, Telescopes, Afterglows, X-Ray Sources, X-Ray Bursts, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, X- And Gamma-Ray Telescopes And Instrumentation, Plasma Reactions

Scientific paper

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'' according to different methods, and to distinguish between various scenarios for ``dark bursts''. For long-duration Swift bursts with a detected X-ray afterglow, we achieve a 90% (35/39) detection rate of optical/NIR afterglows whenever our observations started within less than 240 min after the burst. Complementing our GROND data with Swift/XRT spectra we construct broad-band spectral energy distributions and derive rest-frame extinctions. We detect 25-40% ``dark bursts'', depending on the definition used. The faint optical afterglow emission of ``dark bursts'' is mainly due to a combination of two contributing factors: (i) moderate intrinsic extinction at moderate redshifts, and (ii) about 22% of ``dark'' bursts at redshift >5.

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