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We present new results of fully general relativistic magnetohydrodynamicsimulations of binary neutron star (BNS) mergers performed with the Whiskycode. All the models use a piecewise polytropic approximation of the APR4equation of state for cold matter, together with a 'hybrid' part to incorporatethermal effects during the evolution. We consider both equal and unequal-massmodels, with total masses such that either a supramassive NS or a black hole isformed after merger. Each model is evolved with and without a magnetic fieldinitially confined to the stellar interior. We present the differentgravitational wave (GW) signals as well as a detailed description of the matterdynamics (magnetic field evolution, ejected mass, post-merger remnant/diskproperties). Our simulations provide new insights into BNS mergers, theassociated GW emission and the possible connection with the engine of shortgamma-ray bursts (both in the 'standard' and in the 'time-reversal' scenarios)and other electromagnetic counterparts.

General Relativistic Magnetohydrodynamic Simulations of Binary Neutron Star Mergers with the APR4 Equation of State