Field of GRB 120422A (12′′ × 12′′). The position of the optical transient (OT) accompanying GRB 120422A is marked, as well as the host galaxy and the curved bridge of emission that connects the explosion site with the host’s nucleus. Galaxy G1 has the same redshift as the GRB. The projected distance between the explosion site and the galaxy G1 is 28.7 kpc. The inset shows the field observed in the g′ band with GMOS-N at 270.2 days after the burst. The image cuts were optimised to increase the visibility of the tidal arm that partly connects the host galaxy and G1. The most important slit orientations of our spectroscopic campaign (Table 1) are overlaid.