Abstract
The peculiar nature of the host galaxy of the low-luminosity GRB 100316D has
baffled the astronomers since its first detection. The low distance,
$z=0.0591$, of GRB 100316D and its association with SN 2010bh represent two
important motivations for studying this host galaxy and the GRB's immediate
environment with the high spatial resolution provided by the VLT/MUSE. Its
large field-of-view allows us to create 2D maps of gas metallicity, ionization
level and the star-formation rate distribution maps. Based on these, we derive
that the GRB exploded in the most active star-forming region of the galaxy,
characterized by a low metallicity and a young stellar population. We conclude
that the host is a late-type dwarf galaxy characterized by the presence of
multiple star-forming regions and an extended central region with on-going
shock interactions. The galaxy likely experienced a relatively recent
gravitational encounter, that also triggered an intense burst of star-formation
5-15 Myr ago, generating a massive stellar population (including stars with
masses up to 20 -- 40 $M_ødot$) at the GRB site.
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