Top: light curves for EVRT-2509887 from Evryscope, ASAS-SN, and SOAR. SOAR light curves are integrated from flux-calibrated R ~ 75 spectra, with a small zero-point offset. Middle: apparent g − r color evolution of the flare as a function of time. Bottom: equivalent width of the Ca II, Hβ, and Hα lines over the course of flare observations. Images: 30 × 30 pixel cutouts around each of the Evryscope detections of EVRT-2509887, corresponding to the eight data points in the light curve, plus the first nondetection. The light-curve data, color evolution, and equivalent-width changes are available as data behind the figure.

(The data used to create this figure are available in the online article.)

(The data used to create this figure are available.)