GLASS G102 spectra (top panels), photometry (central panel), and photometric redshift estimate ﹩{\chi }^{2}﹩ curve (bottom panel) for the candidate Lyα emitter at z = 8.1, MACS2129_00899. The photometry includes CH1 and CH2 IRAC 1σ upper limits from SURFS-UP (Bradač et al. 2014) obtained following Huang et al. (2015). The black ﹩{\chi }^{2}﹩ curve in the bottom panel includes F160W, whereas the red curve does does not (F160W has potential contamination and therefore uncertain photometry). In both cases there are valid photometric redshifts around ﹩z\sim 8﹩ (black spectral energy distribution overplotted on the photometry in the center panel) and ﹩z\sim 2﹩ (red spectral energy distribution overplotted on the photometry in the center panel) with marginal statistical difference. The ﹩z\sim 2﹩ solution overestimates the 1σ IRAC constraints. If the line were [O II] λ3727 at z = 1.97, we would expect to see [O III] at roughly 14870 Å. We do not detect any [O III] emission in the GLASS G141 spectra, consistent with the ﹩z\sim 8﹩ solution.