The KM3NeT online processing for multi-messenger alerts

KM3NeT is a deep-sea research infrastructure under construction in the Mediterranean Sea. It consists of two water-Cherenkov neutrino telescopes: ARCA (Italy), designed to identify and study TeV-PeV astrophysical neutrino sources, and ORCA (France), aiming at studying the intrinsic properties of neutrinos in the few-GeV range. Both detectors are also sensitive to neutrinos emitted in the MeV range by core-collapse supernovae. KM3NeT is actively involved in real-time multi-messenger searches, which aim at combining information from the simultaneous observation of complementary cosmic messengers with different observatories. These searches allow to increase the discovery potential of transient sources by sending alerts in real-time when potencial interesting events are detected. The KM3NeT online analysis framework is continuously reconstructing all ARCA and ORCA events, performing core-collapse supernova analyses and searching for spatial and temporal coincidences with alerts received from other multi-messenger instruments. This contribution deals with the description of the KM3NeT online processing system for multi-messenger alerts.