Extended Data Fig. 1: The host of GRB 211211A is a low-mass, actively star-forming galaxy in the local universe.
From: A kilonova following a long-duration gamma-ray burst at 350 Mpc
a, The 2D NOT/ALFOSC spectra of the afterglow and host of GRB 211211A. b, Keck/DEIMOS 1D spectrum (blue) and 1σ uncertainty (dot-dashed blue line) compared with the arbitrarily scaled NOT/ALFOSC afterglow spectrum (red) and Prospector model spectrum (grey). We highlight the strong emission lines in the observed host spectrum, none of which are detected in the 1D or 2D afterglow spectrum. c, The observed host photometry (blue circles) and 3σ uncertainties (blue lines), Prospector model photometry (black squares) and Prospector model spectrum (grey line). The Prospector-derived SED matches the observed photometry, spectral continuum and spectral line strengths well.
