# Photometric Observations of Supernova 2013cq Associated with GRB 130427A

## TL;DR

This paper presents extensive multi-band photometric observations of the afterglow of GRB 130427A, revealing a supernova component similar to SN 1998bw with a peak magnitude of -18.43.

## Contribution

First detailed multi-band photometry of the supernova associated with GRB 130427A over three years.

## Key findings

- Detection of supernova signature in afterglow light curves
- Supernova SN 2013cq has a peak magnitude of -18.43
- Photometric evidence matches SN 1998bw behavior

## Abstract

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 $M_r=-18.43\pm0.11$.