Top panel: the upper limits from Fermi/GBM (Kocevksi 2019) provide an inclination limit for a GRB with a GRB 170817A-like jet structure (pink line with downward arrows). We assume two possible structures following the phenomenology of those in Lamb et al. (2019a), namely a Gaussian (orange) and a two-component structure (blue). The parameters are reported in the text. Bottom panel: r band afterglow for each structure (Gaussian as an orange dotted line, two-component as a blue dash-dotted line) at an inclination of 10° and 20° (thinner lines) assuming an ambient number density n = 10⁻³ cm⁻³, microphysical parameters , and p = 2.15. Upper limits in the r band from VST, and i and z band limits from PS1 are shown as triangles. Models are calculated for a luminosity distance 267 Mpc, the shaded region on the 10° afterglow indicates a ±52 Mpc uncertainty in the luminosity distance.