  Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor
(GECAM), consisting of two micro-satellites, is designed to detect gamma-ray
bursts associated with gravitational-wave events. Here, we introduce the
real-time burst alert system of GECAM, with the adoption of the BeiDou-3 short
message communication service. We present the post-trigger operations, the
detailed ground-based analysis, and the performance of the system. In the first
year of the in-flight operation, GECAM was triggered by 42 GRBs. GECAM
real-time burst alert system has the ability to distribute the alert within
$\sim$1 minute after being triggered, which enables timely follow-up
observations.
