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We analyze short cadence K2 light curve of the TRAPPIST-1 system. Fourieranalysis of the data suggests $P_\mathrm{rot}=3.295\pm0.003$ days. The lightcurve shows several flares, of which we analyzed 42 events, these haveintegrated flare energies of $1.26\times10^{30}-1.24\times10^{33}$ ergs.Approximately 12% of the flares were complex, multi-peaked eruptions. Theflaring and the possible rotational modulation shows no obvious correlation.The flaring activity of TRAPPIST-1 probably continuously alters the atmospheresof the orbiting exoplanets, making these less favorable for hosting life.

Frequent flaring in the TRAPPIST-1 system - unsuited for life?