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Flares are known to play an important role for the evolution of theatmospheres of young planets. In order to understand the evolution of planets,it is thus important to study the flare-activity of young stars. This isparticularly the case for young M-stars, because they are very active. We studyphotometrically and spectroscopically the highly active M-star 2MASSJ16111534-1757214. We show that it is a member of the Upper Sco OB association,which has an age of 5-10 Myrs. We also re-evaluate the status of otherbona-fide M-stars in this region and identify 42 members. Analyzing theK2-light curves, we find that 2MASS J16111534-1757214 has, on average, onesuper-flare with E > 1.0E35 erg every 620 hours, and one with E >1.0E34 ergevery 52 hours. Although this is the most active M-star in the Upper Scoassociation, the power-law index of its flare-distribution is similar to thatof other M-stars in this region. 2MASS J16111534-1757214 as well as otherM-stars in this region show a broken power-law distribution in theflare-frequency diagram. Flares larger than E >3E34 erg have a power-law indexbeta=-1.3+/-0.1 and flares smaller than that beta=-0.8+/-0.1. We furthermoreconclude that the flare-energy distribution for young M-stars is not thatdifferent from solar-like stars.

The Flare-Activity of 2MASSJ16111534-1757214 in the Upper Scorpius association