Optical 5σ limiting magnitudes from Table B.1 and described in Sect. 4.1. LCO epochs (from Table B.2) are shown as vertical lines. At these times, observations in the UBVgri bands were obtained, however no image subtraction was done. We overplot, as an example, the V-band light curve of SN 1998bw, which was associated with GRB 980425. The synthetic light curves of SN 1998bw have been created using the method presented in Cano (2014).