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Very recently, the gravitational-wave (GW) event GW170817 was discovered tobe associated with the short gamma-ray burst (GRB) 170817A. Multi-wavelengthfollow-up observations were carried out, and X-ray, optical, and radiocounterparts to GW170817 were detected. The observations undoubtedly indicatethat GRB 170817A originates from a binary neutron star merger. However, the GRBfalls into the low-luminosity class that could have a higher statisticaloccurrence rate and detection probability than the normal (high-luminosity)class. This implies the possibility that GRB 170817A is intrinsically powerful,but we are off-axis and only observe its side emission. In this Letter, weprovide a timely modeling of the multi-wavelength afterglow emission from thisGRB and the associated kilonova signal from the merger ejecta, under theassumption of a structured jet, a two-component jet, and an intrinsicallyless-energetic quasi-isotropic fireball, respectively. Comparing the afterglowproperties with the multi-wavelength follow-up observations, we can distinguishbetween these three models. Furthermore, a few model parameters (e.g., theejecta mass and velocity) can be constrained.

Afterglows and Kilonovae Associated with Nearby Low-Luminosity Short-Duration Gamma-Ray Bursts: Application to GW170817/GRB170817A