Low-latency infrastructure for rapid dissemination of LIGO-Virgo-KAGRA gravitational-wave alerts

The LIGO-Virgo-KAGRA collaboration (LVK) is in the middle of its fourth observing run, detecting a new gravitational-wave event every few days. These signals go from arriving at the detectors to being broadcast to the world in 30 seconds, enabling rapid multi-messenger and multi-wavelength follow-up. In this talk I will give an overview of the LVK's low-latency alert infrastructure, highlighting upgrades made for this observing run; these involve reduced latency aimed at pre-merger alerts and the publication of low-significance events. In addition, I will describe plans for upgrades as we look ahead to future observing runs, in support of extremely low latency follow-up.