| Gamma-ray bursts (GRBs) are brief flashes of gamma-rays occurring at cosmological distance. In this thesis, we review the observations history of GRBs and standard model (fireball+shocks). We also discuss the central engines of GRBs and the radiation mechanisms.We here consider synchrotron emission, inverse Compton emission, inverse Compton scattering effect, synchronous self absorption and the equal arrival time surface effect when we calculate numerically off-axis observation of GRB in single jet and two component jets. In these two cases, We obtain the different light curves in X-ray, optical and infrared bands. We also compared X-ray band with X-ray flash.We also do off-axis observation of SGRB basing on the Aloy’s simulation in two component jets. We found the infrared bump with high flux. It is much more larger than that of the kilonova which also has a bump in infrared band. We expect the infrared bump may be observed in the future. |
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