Smoothed image of the fields centered on GRB 080913 (HAWK-I, Y band), GRB 060927 (HAWK-I, Y band), and GRB 060522 (FORS2, z_Gunn band). The GRB afterglow localization (circle) based on the optical observations, is relatively accurate (better than 1″). No host galaxy candidate is detected down to the magnitude limits indicated in Table 2. Each image covers a field of view of 30″ × 30″. North is up, east is left.