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The MAGIC telescope has observed very-high energy gamma-ray emission from theBL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8sigma. The light curve shows no significant flux variations on a dailytimescale. The flux level during 2005 was, however, significantly higher ascompared to 2006. The differential energy spectrum between approx. 90 GeV and500 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 ofz=0.74 and z=0.56, respectively, on the yet undetermined redshift of PG1553+113. Recent VLT observations of this blazar show featureless spectra inthe near-IR, thus no direct redshift could be determined from thesemeasurements.

Detection of Very-High Energy Gamma-Rays from the BL Lac Object PG 1553+113 with the MAGIC Telescope