The MUSE view of the host galaxy of GRB 100316D

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 Integral-Field Spectrographs like 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, as well as to investigate the presence of possible host companions.The host is a late-type dwarf irregular galaxy with multiple star-forming regions and an extended central region with signatures of on-going shock interactions.The GRB site is characterized by the lowest metallicity, the highest starformation rate and the youngest (∼ 20-30 Myr) stellar population in the galaxy, which suggest a GRB progenitor stellar population with masses up to 20 -40 M .We note that the GRB site has an offset of ∼660pc from the most luminous SF region in the host.The observed SF activity in this galaxy may have been triggered by a relatively recent gravitational encounter between the host and a small undetected (L Hα ≤ 10 36 erg/s) companion.