Photometric Observations of Supernova 2013cq Associated with GRB 130427A

Becerra, R. L.; Watson, A. M.; Lee, W. H.; Fraija, N.; Butler, N. R.; Bloom, J. S.; Capone, J. I.; Cucchiara, A.; de Diego, J. A.; Fox, O. D.; Gehrels, N.; Georgiev, L. N.; González, J. J.; Kutyrev, A. S.; Littlejohns, O. M.; Prochaska, J. X.; Ramirez-Ruiz, E.; Richer, M. G.; Román-Zúñiga, C. G.; Toy, V. L.; Troja, E.
eprint arXiv:1702.04762


We observed the afterglow of GRB 130427A with the RATIR instrument on the 1.5-m Harold L. Johnson telescope of the Observatorio Astron\'omico Nacional on Sierra San Pedro M\'artir. Our homogenous $griZYJH$ photometry extends from the night of burst to three years later. We fit a model for the afterglow. There is a significant positive residual which matches the behavior of SN 1998bw in the $griZ$ filters; we suggest that this is a photometric signature of the supernova SN 2013cq associated with the GRB. The peak absolute magnitude of the supernova is $M_r=-18.43\pm0.11$.