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Gamma-ray bursts (GRBs) have been proposed as a tool for studying starformation in the Universe, so it is crucial to investigate whether their hostgalaxies and immediate environments are in any way special compared with otherstar-forming galaxies. Here we present spatially resolved maps of dust emissionof the host galaxy of the closest known GRB 980425 at z=0.0085 using our newhigh-resolution observations from Herschel, Atacama Pathfinder Experiment(APEX), Atacama Large Millimeter Array (ALMA) and Australia Telescope CompactArray (ATCA). We modelled the spectral energy distributions of the host and ofthe star-forming region displaying the Wolf-Rayet signatures in the spectrum(WR region), located 800 pc from the GRB position. The host is characterised bylow dust content and a high fraction of UV-visible star formation, similar toother dwarf galaxies. These galaxies are abundant in the local universe, so itis not surprising to find a GRB in one of them, assuming the correspondencebetween the GRB rate and star formation. The WR region contributessubstantially to the host emission at the far-infrared, millimetre, and radiowavelengths and we propose that this is a consequence of its high gas density.If dense environments are also found close to the positions of other GRBs, thenthe ISM density should also be considered, along with metallicity, an importantfactor influencing whether a given stellar population can produce a GRB.

Spatially-resolved dust properties of the GRB 980425 host galaxy