Extended Data Table 1 Log of the spectroscopic observations

From: Signatures of a jet cocoon in early spectra of a supernova associated with a γ-ray burst

  1. The values in the second column refer to days after the GRB discovery (at T0). In the fifth column, the exposure times for the OSIRIS instrument refers to the R1000B grism if there is a single value and to the R1000B and R2500I grisms where there are two values.