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Thousands of active artificial objects are orbiting around Earth along withmuch more non-operational ones -- derelict satellites or rocket bodies,collision debris, or spacecraft payloads, significant part of them beinguncatalogued. They all impact observations of the sky by ground-basedtelescopes by producing a large number of streaks polluting the images, as wellas generating false alerts hindering the search for new astrophysicaltransients. While the former threat for astronomy is widely discussed nowadaysin regard of rapidly growing satellite mega-constellations, the latter one --false transients -- still lacks attention on the similar level.  In this work we assess the impact of satellite glints -- rapid flashesproduced by reflections of a sunlight from flat surfaces of rotating satellites-- on current and future deep sky surveys such as the ones conducted by theZwicky Transient Facility (ZTF) and the Vera Rubin Observatory Legacy Survey ofSpace and Time (LSST). For that, we propose a simple routine that detects, in asingle exposure, a series of repeated flashes along the trajectories ofotherwise invisible satellites, and describe its implementation in FINK alertbroker. Application of the routine to ZTF alert stream revealed about 73,000individual events polluting 3.6\% of all ZTF science images between November2019 and December 2021 and linked to more than 300 different glintingsatellites on all kinds of orbits, from low-Earth up to geostationary ones. Thetimescales of individual flashes are as short as $0.1$--$10^{-3}$ seconds, withinstant brightness of 4--14 magnitudes, peak amplitudes of at least 2--4magnitudes, and generally complex temporal patterns of flashing activity. Weexpect LSST to see much more such satellite glints of even larger amplitudesdue to its better sensitivity.

Impact of satellite glints on the transient science on ZTF scale