GCN Circular 15624
A. Cucchiara (ORAU/NASA-GSFC) and S.B. Cenko (NASA-GSFC) report on behalf of a larger collaboration: "On December 27.42 UT (~ 5.1 hr after the Swift trigger) we began observing the afterglow of GRB 131227A (Oates et al. GCN 15616, Zheng et al. GCN 15617) with the GMOS spectrograph mounted on the Gemini-North telescope. Under poor seeing conditions the afterglow was marginally detected in our i�-band acquisition image. Nevertheless, we performed a spectroscopic sequence of 2x900s spectra with GMOS and the R400 grating, covering the 4400-8600A wavelength range. Clear evidence of continuum flux is detected beyond 7600A, while no flux is present in either spectra nor in a coadded spectrum blueward of this wavelength. No other obvious emission or absorption features are present in the spectrum, though the signal-to-noise ratio is not extremely high. If this break is due to Lyman-alpha, the implied GRB redshift would be z~5.3. We caution, however, that this line of sight is subject to high galactic extinction (A_V= 2.8). We thank the Gemini staff for performing these observations under challenging conditions, in particular Marie Lemoine-Busserolle."