Detection of an additional Lyα emitter, 2.1 arcseconds to the east of GN-z11. Top: JWST/NIRCam F277W image corresponding to the FoV of our NIRSpec/IFU observations. We indicate the region from which we extracted the spectrum on the right with dashed blue contours. We also indicate three foreground galaxies visible in the NIRCam image with their corresponding redshifts. Bottom: Extracted Lyα spectrum from the region indicated in the NIRCam image. The dashed red line shows the best fit to the spectrum, and the dotted black line shows the error spectrum. The dashed green line shows the wavelength of Lyα emission seen in the main component of GN-z11. The foreground galaxies in the vicinity show no visible emission lines that would contaminate this spectrum.