Fig. 4
All-sky map of the galactic dust reddening EB−V as given by Schlafly & Finkbeiner (2011). The GRBs analyzed here are indicated in green. Those indicated in orange were excluded from the sample and those colored in blue are all other known GRBs with a redshift of z> 4. The sky above Dec > 44° cannot be observed from La Silla (Chile), where GROND is mounted at the 2.2 m MPI telescope.
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