An overview of astronomical transient brokers in Rubin era

Vera C. Rubin Observatory, formerly known as the Large Synoptic Survey Telescope (LSST) is approaching its operational phase, and all actors in the scientific/software ecosystem surrounding it are in the last phases of preparations.One of the types of the data that Rubin will publicly deliver are real-time alerts -a data stream of transient astronomical events.These alerts will be disseminated to the public through seven project-approved 'community brokers' -applications used to ingest data stream and provide various additional functionalities.In this review paper we compare software designs and analyze features of seven Rubin community brokers -ALeRCE, AMPEL, ANTARES, Babamul, Fink, Lasair, Pitt-Google.