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We have performed our spectroscopic and multi-color photometric observationsof the recurrent nova U Scorpii at the earliest stage of the 2010 outburst.0.37 days after the discovery of the outburst, we can see broad and prominentemission lines of Balmer series, He I, N II, N III, O I and Mg II on thespectra. The FWHM of H$\alpha$ line yields an expansion velocity ofapproximately 6200 km/s. This line also accompanies a blue shifted absorptionline (so called P Cygni profile). 1.37 days after the discovery, H$\alpha$ lineshows a nearly flat-topped profile in contrast to the previous day. From ourmulti-color photometry, we can see its rapid decline (one magnitude per day) ofthe brightness in each color band.

Spectroscopy and Multi-color Photometry of U Scorpii at the Earliest Stage of 2010 Outburst