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We report the detection of a nearby emission-line companion to the z=4.695quasar BR1202-0725. Deep narrow-band exposures on this field from the UH 2.2 mshow a Ly alpha flux of 1.5\times\ten{-16} ergs cm^{-2} s^{-1}. High-resolutionHST WFC2 imaging in the F814W filter band shows continuum structure near theemission position, at 2.6" NW of the quasar, corresponding to a projectedseparation of ~7.5 h^{-1} kpc for \qnought=0.5, where h=\hnought/100\kmsMpc^{-1}. We discuss possible explanations for the combined line and colorproperties. The ionization is most likely produced by the quasar, but if due tounderlying star formation would require a star formation rate of ~7 h^2 solarmasses per yr.Comment: 12 pages LaTeX (aastex4.0 macros: aasms4.sty, flushrt.sty) plus 3  figures. To appear in the Astrophysical Journal Letters. Typo in original  submission ("2" should have been "7" in luminosity: 7e42 h^{-2} ergs and in  the star formation rate: 7 h^{-2} \msun per yr). Resubmitted with figure

Detection of a Lyα Emission-Line Companion to the [ITAL]z[/ITAL] = 4.69 Quasar BR 1202−0725