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We present a candidate for the most distant galaxy known to date with aphotometric redshift z = 10.7 +0.6 / -0.4 (95% confidence limits; with z < 9.5galaxies of known types ruled out at 7.2-sigma). This J-dropout Lyman BreakGalaxy, named MACS0647-JD, was discovered as part of the Cluster Lensing andSupernova survey with Hubble (CLASH). We observe three magnified images of thisgalaxy due to strong gravitational lensing by the galaxy clusterMACSJ0647.7+7015 at z = 0.591. The images are magnified by factors of ~8, 7,and 2, with the brighter two observed at ~26th magnitude AB (~0.15 uJy) in theWFC3/IR F160W filter (~1.4 - 1.7 um) where they are detected at >~ 12-sigma.All three images are also confidently detected at >~ 6-sigma in F140W (~1.2 -1.6 um), dropping out of detection from 15 lower wavelength HST filters (~0.2 -1.4 um), and lacking bright detections in Spitzer/IRAC 3.6um and 4.5um imaging(~3.2 - 5.0 um). We rule out a broad range of possible lower redshiftinterlopers, including some previously published as high redshift candidates.Our high redshift conclusion is more conservative than if we had neglected aBayesian photometric redshift prior. Given CLASH observations of 17 high massclusters to date, our discoveries of MACS0647-JD at z ~ 10.8 and MACS1149-JD1at z ~ 9.6 are consistent with a lensed luminosity function extrapolated fromlower redshifts. This would suggest that low luminosity galaxies could havereionized the universe. However given the significant uncertainties based ononly two galaxies, we cannot yet rule out the sharp drop off in number countsat z >~ 10 suggested by field searches.

CLASH: Three Strongly Lensed Images of a Candidate z ~ 11 Galaxy