Illustration of a detected EUV burst. The solid curve represents the AIA 171 Å intensity, I, as a function of time at a given pixel in the image sequence. The horizontal dotted lines from top to bottom are four, two, and one times the standard deviation of the light curve (σ_I) above the mean intensity, ⟨I⟩. The open diamond marks the peak that exceeds ⟨I⟩+ 4σ_I. In this case, the intensity at the next time step after the peak is greater than ⟨I⟩+2σ_I. The light curve is therefore flagged as a valid EUV burst signal according to our criteria in Sect. 3.1. Following the light curve forward and backward in time from the peak, the lifetime is defined as the duration between two instances when the signal is still greater than ⟨I⟩+1σ_I (i.e., the length of time that is bounded by the two vertical dotted lines).