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Gravitational waves from a merger of two neutron stars (NSs) were discoveredfor the first time in GW170817, together with diverse electromagnetic (EM)counterparts. To make constraints on a relativistic jet from the NS merger, wecalculate the EM signals in (1) the short gamma-ray burst sGRB 170817A from anoff-axis jet, (2) the optical-infrared macronova (or kilonova), especially theblue macronova, from a jet-powered cocoon, and (3) the X-ray and radioafterglows from the interaction between the jet and interstellar medium. Wefind that a typical sGRB jet is consistent with these observations, and thereis a parameter space to explain all the observations in a unified fashion withan isotropic energy $\sim 10^{51}$-$10^{52}$ erg, opening angle $\sim20^{\circ}$, and viewing angle $\sim 30^{\circ}$. The off-axis emission is lessde-beamed than the point-source case because the viewing angle is comparable tothe opening angle. We also analytically show that the jet energy accelerates afair fraction of the merger ejecta to a sub-relativistic velocity $\sim0.3$-$0.4$c as a cocoon in a wide parameter range. The ambient density might below $\sim 10^{-3}$-$10^{-6}$ cm$^{-3}$, which can be tested by futureobservations of radio flares and X-ray remnants.

Can an Off-axis Gamma-Ray Burst Jet in GW170817 Explain All the Electromagnetic Counterparts?