  Observations with imaging atmospheric Cherenkov telescopes (IACTs) have
enhanced our knowledge of nearby supernova (SN) remnants with ages younger than
500 years by establishing Cassiopeia A and the remnant of Tycho's SN as
very-high-energy (VHE) gamma-ray sources. The remnant of Kepler's SN, which is
the product of the most recent naked-eye supernova in our Galaxy, is comparable
in age to the other two, but is significantly more distant. If the gamma-ray
luminosities of the remnants of Tycho's and Kepler's SNe are similar, then the
latter is expected to be one of the faintest gamma-ray sources within reach of
the current generation IACT arrays.
  Here we report evidence at a statistical level of 4.6 sigma for a VHE signal
from the remnant of Kepler's SN based on deep observations by the High Energy
Stereoscopic System (H.E.S.S.) with an exposure of 152 hours. The measured
integral flux above an energy of 226 GeV is ~0.3% of the flux of the Crab
Nebula. The spectral energy distribution (SED) reveals a gamma-ray emitting
component connecting the VHE emission observed with H.E.S.S. to the emission
observed at GeV energies with Fermi-LAT. The overall SED is similar to that of
the remnant of Tycho's SN, possibly indicating the same non-thermal emission
processes acting in both these young remnants of thermonuclear SNe.
