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We present the spectroscopic discovery of a broad-lined Type Ic supernova (SN2010bh) associated with the nearby long-duration gamma-ray burst (GRB) 100316D.At z = 0.0593, this is the third-nearest GRB-SN. Nightly optical spectraobtained with the Magellan telescopes during the first week after explosionreveal the gradual emergence of very broad spectral features superposed on ablue continuum. The supernova features are typical of broad-lined SNe Ic andare generally consistent with previous supernovae associated with low-redshiftGRBs. However, the inferred velocities of SN 2010bh at 21 days after explosionare a factor of ~2 times larger than those of the prototypical SN 1998bw atsimilar epochs, with v ~ 26,000 km/s, indicating a larger explosion energy or adifferent ejecta structure. A near-infrared spectrum taken 13.8 days afterexplosion shows no strong evidence for He I at 1.083 microns, implying that theprogenitor was largely stripped of its helium envelope. The host galaxy is oflow luminosity (M_R ~ -18.5 mag) and low metallicity (Z < 0.4 Z_solar), similarto the hosts of other low-redshift GRB-SNe.

Spectroscopic Discovery of the Broad-Lined Type Ic Supernova 2010bh Associated with the Low-Redshift GRB 100316D