  Stellar activity can produce large amounts of high-energy radiation, which is
absorbed by the planetary atmosphere leading to irradiation-driven mass-loss.
We present the detection and an investigation of high-energy emission in a
transiting super-Earth host system, GJ 1214, based on an XMM-Newton
observation. We derive an X-ray luminosity LX=7.4E25 erg/s and a corresponding
activity level of log(LX/Lbol)~ -5.3. Further, we determine a coronal
temperature of about -3.5 MK, which is typical for coronal emission of
moderately active low-mass stars. We estimate that GJ 1214 b evaporates at a
rate of 1.3E10 g/s and has lost a total of ~2-5.6 MEarth.
