Top: infrared luminosity and SFR as a function of the CO luminosity, using a CO-to-H₂ conversion factor of α_CO = 5 M_⊙/(K km s⁻¹ pc²). The host of GRB 190114C is indicated with a black filled square, and the companion is shown with an empty square. They are compared to the existing sample of GRB host galaxies and other galaxy samples. Bottom: molecular gas depletion time (or the inverse of the star-formation efficiency), i.e. the ratio of the CO luminosity to the infrared luminosity or the corresponding molecular gas mass with the CO-to-H₂. In this case, only the host galaxy is shown because the metallicity is not available for the companion, together with several galaxy samples. Adapted from Michałowski et al. (2018a).