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An electromagnetic transient powered by the radioactive decay of r-processelements, a so-called kilonova/macronova, is one of the possible observableconsequences of compact binary mergers including at east one neutron star.Recent observations strongly suggest the first discovery of the electromagnetictransient, which is associated with the short GRB 130603B. We explore apossible progenitor of this event combining the numerical-relativitysimulations and radiative transfer simulations of the dynamical ejecta ofbinary neutron star and black hole - neutron star mergers. We show that theejecta models within a realistic parameter range consistently reproduce theobserved near-infrared excess. We also show that the soft equation of statemodels for binary neutron star mergers and the stiff equation of state modelsfor black hole - neutron star mergers are favored to reproduce the observedluminosity.

Progenitor models of the electromagnetic transient associated with the short GRB 130603B