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This event, so far unique, beautifully confirmed the standard views on thegravitational waves produced by a merger of two neutron stars, but itselectromagnetic multi-wavelenth observations disagreed with the numerousinitial versions of the "standard fireball model(s)" of gamma ray bursts.Contrariwise, they provided strong evidence in favour of the "cannonball"model. Most uncontroversially, a cannonball was observed at radio wavelengths,with an overwhelming statistical significance ($>\! 17\,\sigma$), andtravelling in the plane of the sky, as expected, at an apparent superluminalvelocity $V_{app}\sim 4\, c$.

The gravitational wave and short gamma-ray burst GW170817/SHB170817A, not your everyday binary neutron star merger