  During the last ten years, observations of long-duration gamma-ray bursts
brought to the conclusion that at least a fraction of them is associated with
bright supernovae of type Ib/c. In this talk, after a short review on the
previously observed GRB-SN connection cases, we present the recent case of GRB
100316/SN 2010bh. In particular, during the observational campaign of SN
2010bh, a pivotal role was played by VLT/X-shooter, sampling with unique high
quality data the spectral energy distribution of the early evolution phases
from the UV to the K band.

Cosmology and Nongalactic Astrophysics