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PKS 2023-07 is a flat spectrum radio quasar located at a redshift $z=1.388$,farther than any source currently detected at very high energies ($E>100$ GeV).At such energies, absorption by the extragalactic background light (EBL)renders the detection of distant sources particularly challenging. The HighEnergy Stereoscopic System (H.E.S.S.) observed the source following reportsfrom AGILE (April 2016) and Fermi-LAT (April 2016, September and October 2017)on high-flux states in gamma rays. During each of the three flaring periods,near-simultaneous observations were obtained with H.E.S.S., Fermi-LAT andmultiple telescopes at other wavelengths. Though the source was notsignificantly detected by H.E.S.S., upper limits were derived for eachobservation period. Through constraints given by Fermi-LAT in the MeV--GeVdomain and differential upper limits by H.E.S.S., we searched for an intrinsiccutoff in the EBL-corrected gamma ray spectrum of PKS 2023-07.

Observations of blazar PKS 2023-07 in flaring state with HESS and Fermi-LAT in 2016-2017 and constraints on an intrinsic cut-off