Observations. Left panel: four SN images of iPTF16geu on HST images taken in October 2016 (P.I.: Ariel Goobar). The red, green, and blue bands correspond to the F814W, F625W, and F475W filters, respectively. Right panel: same lensing system but ≈2 years later in F814W, and F625W bands. The SN is not visible anymore but the host galaxy can be seen more clearly, forming a nearly perfect Einstein ring around the center of the lens.