Extended Data Fig. 5: Spectrum of GRB 171205A/ SN 2017iuk obtained 1.5 h after the GRB detection.
From: Signatures of a jet cocoon in early spectra of a supernova associated with a γ-ray burst
This spectrum was obtained with VLT/X-shooter in the range 3,200–19,000 Å. The inset shows the UVB arm (3,200–5,500 Å), where the emission excess at wavelengths up to 4,000 Å and a possible absorption feature at about 3,700 Å are shown.
