Metallicity in the GRB 100316D/SN 2010bh Host Complex
  The recent long-duration GRB 100316D, associated with supernova SN 2010bh and
detected by Swift, is one of the nearest GRB-SNe ever observed (z = 0.059).
This provides us with a unique opportunity to study the explosion environment
on ~kpc scale in relation to the host galaxy complex. Here we present
spatially-resolved spectrophotometry of the host galaxy, focusing on both the
explosion site and the brightest star-forming regions. Using these data, we
extract the spatial profiles of the relevant emission features (Halpha, Hbeta,
[OIII] 5007A, and [NII] 6584A), and use these profiles to examine variations in
metallicity and star formation rate as a function of position in the host
galaxy. We conclude that GRB 100316D/SN2010bh occurred in a low-metallicity
host galaxy, and that the GRB-SN explosion site corresponds to the region with
the lowest metallicity and highest star formation rate sampled by our
observations.
