Abstract: | Extensive multi-band afterglow data are available for GRB 980703. Especially, its radio afterglow was very bright and was
monitored until more than 1000 days after the trigger time. Additionally, there is no obvious special feature, i.e., no rebrightenings,
no plateau, and no special steep decay or slow decay in the multi-band afterglow light curves. All these conditions make GRB
980703 a precious sample in gamma-ray burst research. Here we use the observational data of GRB 980703 to test the standard
fireball model in depth. It is found that the model can give a satisfactory explanation to the multi-band and overall afterglow
light curves. The beaming angle of GRB 980703 is derived as ∼ 0.23 radian, and the circum-burst medium density is ∼ 27 cm−3. The total isotropic equivalent kinetic energy of the ejecta is ∼ 3.8 × 1052 ergs. A rest-frame extinction of A
V
∼ 2.5 mag in the host galaxy is also derived. |