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

J. Greiner, T. Krühler, S. Klose, P. Afonso, C. Clemens, R. Filgas, D.~H. Hartmann, A. Küpcü Yoldaș, M. Nardini, F. Olivares E., A. Rau, A. Rossi, P. Schady, A. Updike

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198 Citations (SciVal)


Context. Thirteen years after the discovery of the first afterglows, the nature of dark gamma-ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X-ray afterglow, optical/NIR emission is only seen for 40–60% of them. Aims. 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” according to different methods, and to distinguish between various scenarios for “dark bursts”. Methods. Observations were performed with the 7-channel “Gamma-Ray Optical and Near-infrared Detector” (GROND) at the 2.2 m MPI/ESO telescope. We used the afterglow detection rate in dependence on the delay time between GRB and the first GROND exposure. Results. 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. Conclusions. 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.
Original languageEnglish
Article numberA30
JournalAstronomy & Astrophysics
Publication statusPublished - Feb 2011


  • gamma-rays burst: general, techniques: photometric, Astrophysics - High Energy Astrophysical Phenomena


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