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Surveys aiming at supernovae include initiatives to find them. Spotting them early in their life in order that early data can be recorded is of considerable value but requires continuous specialized observation. The Zwicky Transient Facility (ZTF) has been serving this purpose, along with the monitoring of data from other existing surveys that repeatedly cover much of the sky, such as Pan-STARRS and ATLAS survey which are primarily looking for solar system near-Earth objects. Gaia also made such discoveries while it was observing portions of the sky repeatedly for determining proper motions of stars throughout the celestial sphere. The Rubin Observatory (LSST) would seemingly handle much of this as time goes on: with its large aperture, it spots fainter such transients, but given its large survey field, its cadence regarding any particular portion of the celestial sphere is slower.
Surveys specifically of Type Ia supernovae (Type Ia supernova surveys) have been of interest in cosmology, as standard candles to help determine the Hubble constant. They were instrumental in recognizing the acceleration that motived the concept of dark energy.
Some surveys dedicated to or including supernovae discoveries:
Supernova and candidate discoveries are currently tracked by the Transient Name Server, a clearinghouse for discovered transients.