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The active galactic nucleus PG 1553+113 was observed by the MAGIC telescopein July 2006 during a multiwavelength campaign, in which telescopes in theoptical, X-ray, and very high energies participated. Although the MAGIC datawere affected by strong atmospheric absorption (calima), they were analyzedafter applying a correction. In 8.5 hours, a signal was detected with asignificance of 5.0 sigma. The integral flux above 150 GeV was (2.6 +/-0.9)*10^{-7} ph/s/m^2. By fitting the differential energy spectrum with a powerlaw, a spectral index of -4.1 +/- 0.3 was obtained.

MAGIC Observations of PG 1553+113 during a Multiwavelength Campaign in July 2006