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The TeV binary system LS I +61$^\circ$ 303 is known for its regular,non-thermal emission pattern which traces the orbital period of the compactobject in its 26.5 day orbit around its B0 Ve star companion. The systemtypically presents elevated TeV emission around apastron passage with fluxlevels between 5% and 15% of the steady flux from the Crab Nebula (> 300 GeV).In this article, VERITAS observations of LS I +61$^\circ$ 303 taken in late2014 are presented, during which bright TeV flares around apastron at fluxlevels peaking above 30% of the Crab Nebula flux were detected. This is thebrightest such activity from this source ever seen in the TeV regime. Thestrong outbursts have rise and fall times of less than a day. The shorttimescale of the flares, in conjunction with the observation of 10 TeV photonsfrom LS I +61$^\circ$ 303 during the flares, provides constraints on theproperties of the accelerator in the source.

Exceptionally bright TeV flares from the binary LS I +61$^\circ$ 303