Multicolour modelling of SN 2013dx associated with GRB 130702A★

Abstract

We present optical observations of SN 2013dx, related to the Fermi burst GRB\n130702A occurred at a redshift z = 0.145. It is the second-best sampled GRB-SN\nafter SN~1998bw: the observational light curves contain more than 280 data\npoints in uBgrRiz filters until 88 day after the burst, and the data were\ncollected from our observational collaboration (Maidanak Observatory,\nAbastumani Observatory, Crimean Astrophysical Observatory, Mondy Observatory,\nNational Observatory of Turkey, Observatorio del Roque de los Muchachos) and\nfrom the literature. We model numerically the multicolour light curves using\nthe one-dimensional radiation hydrodynamical code STELLA, previously widely\nimplemented for the modelling of typical non-GRB SNe. The best-fitted model has\nthe following parameters: pre-supernova star mass M = 25 M_Sun, mass of a\ncompact remnant M_CR = 6 M_Sun, total energy of the outburst E_oburst = 3.5 x\n10^(52) erg, pre-supernova star radius R = 100 R_Sun, M_56Ni = 0.2 M_Sun which\nis totally mixed through the ejecta; M_O = 16.6 M_Sun, M_Si = 1.2 M_Sun, and\nM_Fe = 1.2 M_Sun, and the radiative efficiency of the SN is 0.1 per cent.\n