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The recent long-duration GRB 100316D, associated with supernova SN 2010bh anddetected 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 environmenton ~kpc scale in relation to the host galaxy complex. Here we presentspatially-resolved spectrophotometry of the host galaxy, focusing on both theexplosion site and the brightest star-forming regions. Using these data, weextract the spatial profiles of the relevant emission features (Halpha, Hbeta,[OIII] 5007A, and [NII] 6584A), and use these profiles to examine variations inmetallicity and star formation rate as a function of position in the hostgalaxy. We conclude that GRB 100316D/SN2010bh occurred in a low-metallicityhost galaxy, and that the GRB-SN explosion site corresponds to the region withthe lowest metallicity and highest star formation rate sampled by ourobservations.

Metallicity in the GRB 100316D/SN 2010bh Host Complex