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PKS 1510-089 (z=0.361) is one of only a handful of flat spectrum radioquasars that have been detected at very high energy (VHE, $E>100\,$GeV) gammarays. It is a very active source across the entire electromagnetic spectrum.VHE observations in May 2016 with H.E.S.S. and MAGIC revealed an exceptionallystrong flare, which lasted for less than two nights, and exhibited a peak fluxof about 0.8 times the flux of the Crab Nebula above $200\,$GeV. The flareprovides the first evidence of intranight variability at VHE in this source.While optical observations with ATOM reveal a counterpart at opticalfrequencies, Fermi-LAT observations reveal only low flux variability at highenergy (HE, $E>100\,$ MeV) gamma rays. Interestingly, the HE spectral indexsignificantly hardens during the peak of the VHE flare, indicating a strongshift of the peak frequency of the high energy component. Given the expectedstrong absorption due to the broad-line region, the VHE emission region cannotbe located deep within that region.

The exceptional VHE gamma-ray outburst of PKS 1510-089 in May 2016