Correlation between luminosity L_b, z and the end time T_b, z. Here we set Ω_m = 0.315 and H₀ = 67.36 km s⁻¹ Mpc⁻¹ for calculating the luminosity from the measured flux. The data points are the GRBs in X-ray (upper left) and optical samples (upper right). The blue lines correspond to the best-fitting values of the data points with a 95% confidence band. The bottom panels show the 2D posterior contour corner diagrams of the related parameters of the L_b, z − T_b, z correlation for the X-ray (left panel) and optical sample (right panel).