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We present Hubble WFC3/IR slitless grism spectra of a remarkably bright$z\gtrsim10$ galaxy candidate, GN-z11, identified initially fromCANDELS/GOODS-N imaging data. A significant spectroscopic continuum break isdetected at $\lambda=1.47\pm0.01~\mu$m. The new grism data, combined with thephotometric data, rule out all plausible lower redshift solutions for thissource. The only viable solution is that this continuum break is the Ly$\alpha$break redshifted to ${z_\mathrm{grism}=11.09^{+0.08}_{-0.12}}$, just $\sim$400Myr after the Big Bang. This observation extends the current spectroscopicfrontier by 150 Myr to well before the Planck (instantaneous) cosmicreionization peak at z~8.8, demonstrating that galaxy build-up was wellunderway early in the reionization epoch at z>10. GN-z11 is remarkably andunexpectedly luminous for a galaxy at such an early time: its UV luminosity is3x larger than L* measured at z~6-8. The Spitzer IRAC detections up to 4.5$\mu$m of this galaxy are consistent with a stellar mass of${\sim10^{9}~M_\odot}$. This spectroscopic redshift measurement suggests thatthe James Webb Space Telescope (JWST) will be able to similarly and easilyconfirm such sources at z>10 and characterize their physical properties throughdetailed spectroscopy. Furthermore, WFIRST, with its wide-field near-IRimaging, would find large numbers of similar galaxies and contribute greatly toJWST's spectroscopy, if it is launched early enough to overlap with JWST.

A Remarkably Luminous Galaxy at z=11.1 Measured with Hubble Space Telescope Grism Spectroscopy