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The gravitational-wave event S190521g -- a likely binary black hole merger inthe accretion disk of an active galactic nucleus -- was accompanied by anoptical counterpart. Such dense environments around luminous energy releaseregions are favourable for high energy $\gamma$-ray production. We report on asearch for high energy $\gamma$-rays from the direction of the candidateelectromagnetic counterpart to the S190521g event using publicly-available dataof the Fermi-LAT space $\gamma$-ray telescope. No significant signal was found.We present upper limits on the spectral energy distribution of the source inthe 100 MeV - 300 GeV energy range. We discuss the importance of studyingS190521g-like transients in the context of cosmic ray acceleration,$\gamma$-ray and neutrino production in such sources.

Search for high energy $\gamma$-rays from the direction of the candidate  electromagnetic counterpart to the binary black hole merger  gravitational-wave event S190521g