Data points show the Spitzer + GRAVITY, and Chandra photometry during T1 to T6, respectively (dark red to dark blue lines). The data are corrected for the effects of absorption and dust scattering. The lines show the best-fit synchrotron with cooling break and high-energy cutoff models. During the early phases of the flare, the high-energy cutoff appears to be at low energy. During the peak of the flare, the cutoff moves to the X-ray band and then drops again to low energies toward the end of the flare. The submillimeter data shown are the same as in Fig. 4, and the color bar indicates the time and color progression.