Name: Yong-Yeon Keum
 Institution: Institute for the Early Universe
 Title: Constranting Dark-Energy Models with SNe Ia and Gamma-Ray Burst data 
 Key Words: Dark-Energy, Supernovae Ia, GRBs
 Abstract: We use both SNe Ia type data and the measurement of Gamma-Ray-Burst(GRB) distances to constrain dark-energy cosmological model parameters. On fo the possible way to improve our understanding of how dark-energy bahaves is to study the evolution of the universe at redshift higher than those probed by SNe Ia. This requires standard candels that are visible at great distance. GRBs could in principle serve as such high redshift standardizable candels. We employ two different calibrating methods: fitting luminosity relation of GRBs in each cosmology and using distance measures computed from binned GRB data.