Phase coverage of the observing epochs. With the three epochs, we fully cover phases of 0.34 through 0.63. The two CRIRES+ epochs are newly presented in this paper, while the IGRINS epoch was first presented in Y. Shu et al. (2026). The gray region represents the time when CoRoT-2 b is in eclipse, while the black dashed line shows the phase where CoRoT-2 b has its maximum brightness based on the observed Spitzer phase curves. Our observations cover the time of peak expected brightness with about 3 hr of baseline continuing afterward.