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We report the serendipitous discovery of an [O III] $\lambda\lambda$4959/5007and H$\alpha$ line emitter in the Epoch of Reionization (EoR) with the JWSTcommissioning data taken in the NIRCam wide field slitless spectroscopy (WFSS)mode. Located $\sim$55" away from the flux calibrator P330-E, this galaxyexhibits bright [O III] $\lambda\lambda$4959/5007 and H$\alpha$ lines detectedat 3.7, 9.9 and 5.7$\sigma$, respectively, with a spectroscopic redshift of$z=6.112\pm0.001$. The total H$\beta$+[O III] equivalent width is 664$\pm$98\r{A} (454$\pm$78 \r{A} from the [O III] $\lambda$5007 line). This providesdirect spectroscopic evidence for the presence of strong rest-frame opticallines (H$\beta$+[O III] and H$\alpha$) in EoR galaxies as inferred previouslyfrom the analyses of Spitzer/IRAC spectral energy distributions. Two spatialand velocity components are identified in this source, possibly indicating thatthis system is undergoing a major merger, which might have triggered theongoing starburst with strong nebular emission lines over a timescale of$\sim$2 Myr as our SED modeling suggests. The tentative detection of He II$\lambda$4686 line ($1.9\sigma$), if real, may indicate the existence of veryyoung and metal-poor star-forming regions with a hard UV radiation field.Finally, this discovery demonstrates the power and readiness of the JWST/NIRCamWFSS mode, and marks the beginning of a new era for extragalactic astronomy, inwhich EoR galaxies can be routinely discovered via blind slitless spectroscopythrough the detection of rest-frame optical emission lines.

First Peek with JWST/NIRCam Wide-Field Slitless Spectroscopy: Serendipitous Discovery of a Strong [O III]/H$\alpha$ Emitter at $z=6.11$