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We present the results of a systematic search for Lyman-alpha emitters (LAEs)at $6 \lesssim z \lesssim 7.6$ using the HST WFC3 Infrared SpectroscopicParallel (WISP) Survey. Our total volume over this redshift range is $\sim 8\times10^5$ Mpc$^3$, comparable to many of the narrowband surveys despite theirlarger area coverage. We find two LAEs at $z=6.38$ and $6.44$ with lineluminosities of L$_{\mathrm{Ly}\alpha} \sim 4.7 \times 10^{43}$ erg s$^{-1}$,putting them among the brightest LAEs discovered at these redshifts. Takingadvantage of the broad spectral coverage of WISP, we are able to rule outalmost all lower-redshift contaminants. The WISP LAEs have a high numberdensity of $7.7\times10^{-6}$ Mpc$^{-3}$. We argue that the LAEs reside inMpc-scale ionized bubbles that allow the Lyman-alpha photons to redshift out ofresonance before encountering the neutral IGM. We discuss possible ionizingsources and conclude that the observed LAEs alone are not sufficient to ionizethe bubbles.

A High Space Density of Luminous Lyman Alpha Emitters at z~6.5