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Shirasaki","submitted_at":"2010-03-19T05:50:59Z","abstract_excerpt":"We present optical and near infrared observations of GRB 080325 classified as a \"Dark GRB\". Near-infrared observations with Subaru/MOIRCS provided a clear detection of afterglow in Ks band, although no optical counterpart was reported. The flux ratio of rest-wavelength optical to X-ray bands of the afterglow indicates that the dust extinction along the line of sight to the afterglow is Av = 2.7 - 10 mag. This large extinction is probably the major reason for optical faintness of GRB 080325. 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