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We show that the peculiar early optical and in particular X-ray afterglowemission of the short duration burst GRB 130603B can be explained by continuousenergy injection into the blastwave from a supra-massive magnetar centralengine. The observed energetics and temporal/spectral properties of the lateinfrared bump (i.e., the "kilonova") are also found consistent with emissionfrom the ejecta launched during an NS-NS merger and powered by a magnetarcentral engine. The isotropic-equivalent kinetic energies of both the GRBblastwave and the kilonova are about $E_{\rm k}\sim 10^{51}$ erg, consistentwith being powered by a near-isotropic magnetar wind. However, this relativelysmall value demands that most of the initial rotational energy of the magnetar$(\sim {\rm a~ few \times 10^{52}~ erg})$ is carried away by gravitational waveradiation. Our results suggest that (i) the progenitor of GRB 130603B would bea NS-NS binary system, whose merger product would be a supra-massive neutronstar that lasted for about $\sim 1000$ seconds; (ii) the equation-of-state ofnuclear matter would be stiff enough to allow survival of a long-livedsupra-massive neutron star, so that it is promising to detect brightelectromagnetic counterparts of gravitational wave triggers without short GRBassociations in the upcoming Advanced LIGO/Virgo era.

A supra-massive magnetar central engine for short GRB 130603B