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We report the imaging and spectroscopic localization of GRB 060218 to alow-metallicity dwarf starburst galaxy at z = 0.03345 +/- 0.00006. In additionto making it the second nearest gamma-ray burst known, optical spectroscopyreveals the earliest detection of weak, supernova-like Si II near 5720Angstroms (0.1c), starting 1.95 days after the burst trigger. UBVRI photometryobtained between 1 and 26 days post-burst confirms the early rise of supernovalight, and suggests a short time delay between the gamma-ray burst and theonset of SN 2006aj if the early appearance of a soft component in the X-rayspectrum is understood as a ``shock breakout''. Together, these results verifythe long-hypothesized origin of soft gamma-ray bursts in the deaths of massivestars.Comment: 5 pages, 2 figure

GRB 060218/SN 2006aj: A Gamma-Ray Burst and Prompt Supernova atz= 0.0335