The original thermoelastic response of the mirror was documented in T970212, using the IDEAS finite element code. The analysis was redone using ANSYS and an analytical (series expansion); These two approaches agree with each other fairly well. The new results are similar to the original steady-state calculations in the original T970212-x0. The new results are uploaded to T970212-v1. While the  characteristic time for the thermal response of the mirror (assuming only radiative coupling, no conduction) is ~190 sec (~3 minutes), the thermal response and thermoelastic deflection are at 90% of the steady-state value in ~30 seconds.