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We report upper limits to the very high energy flux (E>100 GeV) of the flatspectrum radio quasar 3C454.3 (z=0.859) derived by the Cherenkov telescopeMAGIC during the high states of July/August and November/December 2007. Wecompare the upper limits derived in both time slots with the availablequasi-simultaneous MeV-GeV data from the AGILE gamma-ray satellite andinterpret the observational results in the context of leptonic emission models.The source was observed with the MAGIC telescope during the active phases ofJuly-August 2007 and November-December 2007 and the data were analyzed with theMAGIC standard analysis tools. For the periods around the ends of July andNovember, characterized by the most complete multifrequency coverage, weconstructed the spectral energy distributions using our data together withnearly simultaneous multifrequency (optical, UV, X-ray and GeV) data. Onlyupper limits can be derived from the MAGIC data. The upper limits, oncecorrected for the expected absorption by the extragalactic background light,together with nearly simultaneous multifrequency data, allow us to constrainthe spectral energy distribution of 3C454.3. The data are consistent with themodel expectations based on the inverse Compton scattering of the ambientphotons from the broad line region by relativistic electrons, which robustlypredicts a sharp cut-off above 20-30 GeV.

MAGIC upper limits to the VHE gamma-ray flux of 3C454.3 in high emission state