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We present the detection of an energetic flare on the pre-main sequence M3star NGTS J121939.5-355557, which we estimate as only 2 Myr old. The flare hadan energy of $3.2\pm^{0.4}_{0.3}\times 10^{36}$erg and a fractional amplitudeof $7.2\pm0.8$, making it one of the most energetic flares seen on an M star.The star is also X-ray active, in the saturated regime with $log L_{X}/L_{Bol}= -3.1$. In the flare peak we have identified multi-mode quasi-periodicpulsations formed of two statistically significant periods of approximately 320and 660 seconds. This flare is one of the largest amplitude events to exhibitsuch pulsations. The shorter period mode is observed to start after ashort-lived spike in flux lasting around 30 seconds, which would not have beenresolved in Kepler or TESS short cadence modes. Our data shows how the highcadence of NGTS can be used to apply solar techniques to stellar flares andidentify potential causes of the observed oscillations. We also discuss theimplications of this flare for the habitability of planets around M star hostsand how NGTS can aid in our understanding of this.

Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS