THE INTERPRETATION OF THE MULTI-WAVELENGTH AFTERGLOW EMISSION OF SHORT GRB 140903A

Abstract

GRB 140903A, a short duration γ -ray burst (SGRB) detected by Swift , is characterized by its long-lasting radio emission among SGRBs. In addition to the ∼ 10 6 s radio afterglow emission, the afterglow of GRB 140903A displays a plateau from 10 3 s to 7 × 10 3 s in the X-rays. In this work, we attribute the X-ray plateau to the energy injection into the decelerating blast wave and then model the later radio/optical/X-ray afterglow emission within the standard fireball afterglow model. The afterglow emission has been well reproduced with reasonable physical parameters, including a jet half-opening angle of ∼0.05.