Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through Far-ultraviolet Observations

We present the discovery of an extreme flaring event from Proxima Cen by ASKAP, ALMA, HST, TESS, and du Pont Telescope that occurred on 2019 May 1. In millimeter FUV, this flare is brightest ever detected, brightening a factor >1000 >14000 as seen ALMA respectively. The FUV continuum emission trace each other closely during flare, suggesting could serve proxy for stellar flares become powerful new tool to constrain high-energy radiation environment exoplanets. Surprisingly, optical associated with peaks at much lower level time delay. initial burst has extremely short duration, lasting <10 sec. Taken together growing sample M dwarf flares, suggests actually common often originates burst-like events.