A detailed study of the optical attenuation of gamma-ray bursts in the Swift era

O M Littlejohns,Nathaniel R Butler,Antonino Cucchiara,Alan M Watson,Ori D Fox,W H Lee,Alexander S Kutyrev,Michael G Richer,Christopher R Klein,Jason Xavier Prochaska, J S Bloom,Eleonora Troja,Enrico Ramirezruiz,J A De Diego,Leonid N Georgiev,J J Gonzalez,Carlos G Romanzuniga,N Gehrels,Harvey Moseley

Monthly Notices of the Royal Astronomical Society（2015）

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摘要

We present optical and near-infrared (NIR) photometry of 28 gamma-ray bursts (GRBs) detected by the Swift satellite and rapidly observed by the Reionization and Transients Infrared/Optical (RATIR) camera. We compare the optical flux at fiducial times of 5.5 and 11 h after the high-energy trigger to that in the X-ray regime to quantify optical darkness. 46 ± 9 per cent (13/28) of all bursts in our ...

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gamma-ray bursts: general,galaxies: distances and redshifts,galaxies: ISM

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