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The Reactor Experiment for Neutrino Oscillation (RENO) has been takingelectron antineutrino ($\overline{\nu}_{e}$) data from the reactors inYonggwang, Korea, using two identical detectors since August 2011. Usingroughly 500 live days of data through January 2013 we observe 290,775 (31,514)reactor $\overline{\nu}_{e}$ candidate events with 2.8 (4.9)% background in thenear (far) detector. The observed visible positron spectra from the reactor$\overline{\nu}_{e}$ events in both detectors show discrepancy around 5 MeVwith regard to the prediction from the current reactor $\overline{\nu}_{e}$model. Based on a far-to-near ratio measurement using the spectral and rateinformation we have obtained $\sin^2 2 \theta_{13} = 0.082 \pm 0.009({\rmstat.}) \pm 0.006({\rm syst.})$ and $|\Delta m_{ee}^2|=[2.62_{-0.23}^{+0.21}({\rm stat.})_{-0.13}^{+0.12}({\rm syst.})]\times10^{-3}$eV$^2$.

Spectral Measurement of the Electron Antineutrino Oscillation Amplitude and Frequency using 500 Live Days of RENO Data