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Context. QSO B0218+357 is a gravitationally lensed blazar located at aredshift of 0.944. The gravitational lensing splits the emitted radiation intotwo components, spatially indistinguishable by gamma-ray instruments, butseparated by a 10-12 day delay. In July 2014, QSO B0218+357 experienced aviolent flare observed by the Fermi-LAT and followed by the MAGIC telescopes.Aims. The spectral energy distribution of QSO B0218+357 can give information onthe energetics of z ~ 1 very high energy gamma- ray sources. Moreover thegamma-ray emission can also be used as a probe of the extragalactic backgroundlight at z ~ 1. Methods. MAGIC performed observations of QSO B0218+357 duringthe expected arrival time of the delayed component of the emission. The MAGICand Fermi-LAT observations were accompanied by quasi-simultaneous optical datafrom the KVA telescope and X-ray observations by Swift-XRT. We construct amultiwavelength spectral energy distribution of QSO B0218+357 and use it tomodel the source. The GeV and sub-TeV data, obtained by Fermi-LAT and MAGIC,are used to set constraints on the extragalactic background light. Results.Very high energy gamma-ray emission was detected from the direction of QSOB0218+357 by the MAGIC telescopes during the expected time of arrival of thetrailing component of the flare, making it the farthest very high energygamma-ray sources detected to date. The observed emission spans the energyrange from 65 to 175 GeV. The combined MAGIC and Fermi-LAT spectral energydistribution of QSO B0218+357 is consistent with current extragalacticbackground light models. The broad band emission can be modeled in theframework of a two zone external Compton scenario, where the GeV emission comesfrom an emission region in the jet, located outside the broad line region.

Detection of very high energy gamma-ray emission from the gravitationally-lensed blazar QSO B0218+357 with the MAGIC telescopes