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2006MNRAS.365.1031D - Mon. Not. R. Astron. Soc., 365, 1031-1038 (2006/January-3)
Swift and optical observations of GRB 050401.
DE PASQUALE M., BEARDMORE A.P., BARTHELMY S.D., BOYD P., BURROWS D.N., FINK R., GEHRELS N., KOBAYASHI S., MASON K.O., McNOUGHT R., NOUSEK J.A., PAGE K.L., PALMER D.M., PETERSON B.A., PRICE P.A., RICH J., ROMING P., ROSEN S.R., SAKAMOTO T., SCHMIDT B.P., TUELLER J., WELLS A.A., ZANE S., ZHANG B. and ZIAEEPOUR H.
Abstract (from CDS):
The GRB 050401 afterglow is quite bright in the X-ray band, but weak in the optical, with an optical to X-ray flux ratio similar to those of `dark bursts'. We detect a significant amount of absorption in the X-ray spectrum, with NH= (1.7±0.2)x1022/cm2 at a redshift of z= 2.9, which is typical of a dense circumburst medium. Such high column density implies an unrealistic optical extinction of 30 mag if we adopt a Galactic extinction law, which would not be consistent with the optical detection of the afterglow. This suggests that the extinction law is different from the Galactic one.
Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS
Journal keyword(s): ISM: dust, extinction - gamma-rays: bursts
Simbad objects: 9
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