Light curves and spectra of a nonthermal flare computed for a variable particle injection rate. Left panel: Light curves at different energies (500 GHz: green; NIR: red; X-rays: blue) computed for a variable injection rate Q₀ that mimics red noise (dashed gray line). All other parameters are the same as in Table 1. Two episodes of acceleration are assumed to take place and are indicated by the horizontal bars. The time series in the left panel are normalized to their peak values, and a zoom in the first 10 h is shown in the inset plot. The light curves do not account for the background flux arising from the accretion flow. Right panel: SED snapshots of our model. For comparison, the quiescent emission model of Yuan et al. (2003) is also shown (dotted curve). An animation of the full temporal evolution of the broadband spectra can be found at this link.