Turning to the Dark Side: Evidence for Circumburst Extinction of Gamma-Ray Bursts with Dark Optical Afterglows


We present evidence that the majority of rapidly-, well-localized gamma-ray bursts with undetected, or dark, optical afterglows, or ‘dark bursts’ for short, are most likely the result of extinction by dust in the circumburst medium. First, we show that the dark bursts cannot be explained by a failure to image deeply enough quickly enough: We fit a variety… (More)


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