The universe bustles with activities. From stellar space weather events nearby to violent explosions faraway, a range of phenomena generate transient radio signals. Because the OVRO-LWA can image the entire hemisphere at once, it makes an ideal monitor for transients in the low-frequency radio sky.

Transient surveys in radio frequencies have uncovered a treasure trove of phenomena over the years. Transient surveys at the millisecond timescales led to the discoveries of extreme objects pulsars and Fast Radio Bursts (FRBs) that also probe fundamental physics. On longer timescales, transient surveys have uncovered both stellar activities in our own galaxy as well as relativistic explosions outside our galaxy. A sensitive all-seeing instrument, the OVRO-LWA can monitor the universe out to a large distance and uncover rare transient events. Such an exploration holds the potential of unveiling new populations of transient sources and new physical processes at work in our universe.