  The MAGIC telescope has observed very-high energy gamma-ray emission from the
BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8
sigma. The light curve shows no significant flux variations on a daily
timescale. The flux level during 2005 was, however, significantly higher as
compared to 2006. The differential energy spectrum between approx. 90 GeV and
500 GeV is well described by a power law with a spectral index of -4.2+-0.3.
The photon energy spectrum and spectral modeling allow to pose upper limits of
z=0.74 and z=0.56, respectively, on the yet undetermined redshift of PG
1553+113. Recent VLT observations of this blazar show featureless spectra in
the near-IR, thus no direct redshift could be determined from these
measurements.
