CTAO-North array detectability of the predicted γ-ray emission at 25 GeV (left plot) and 250 GeV (right plot) for GRB 230812B (z = 0.36) and for a GRB 230812B-like event but with a larger redshift of z = 2. The red lines represent the intrinsic GRB emission (dark-red), EBL-attenuated (observed) emission at redshift z = 0.36 (red), and at redshift z = 2.0 (light-red). The horizontal lines are the differential sensitivity of CTAO with different exposures: 1 min: light-green, 10 min: green, and 60 min: dark-green.