Extended Data Fig. 5: Optical–NIR spectra of GRB 190114C.
From: Observation of inverse Compton emission from a long γ-ray burst
a, NOT/AlFOSC spectrum obtained at mid-time (i.e., the epoch corresponding to a half of the exposure length) 1 h post-burst. The continuum is afterglow-dominated at this time, and shows strong absorption features of Ca ii and Na i (in addition to telluric absorption). b, Normalized GTC (+OSIRIS) spectrum obtained on 14 January 2019, 23:32:03 ut with the R1000B and R2500I grisms. The emission lines of the underlying host galaxy are noticeable, besides the Ca ii absorption lines in the afterglow spectrum. c, Visible-light region of the VLT–X-shooter spectrum obtained approximately 3.2 d post-burst, showing strong emission lines from the star-forming host galaxy.
