Recent progress on GRB cosmology: cosmography using GRBs

It was widely shown that the cosmological parameters and dark energy can be constrained by using type‐Ia supernovae (SNe Ia). Recently gamma‐ray bursts (GRBs) were also argued to be promising standard candles for cosmography. In this paper, We calibrate the luminosity relations of GRBs and present constraints on cosmographic parameters by combining a recent GRB sample with SNe Ia. We find the ΛCDM model is consistent with the current data using the model independent constraints on cosmographic parameters. Furthermore, we find that the XCDM model and generalized Chaplygin gas(GCG) model could be distinguished by snap parameters.