The Amsterdam-ASTRON Radio Transients Facility And Analysis Center (AARTFAAC)all sky monitor is a sensitive, real time transient detector based on the LowFrequency Array (LOFAR). It generates images of the low frequency radio skywith spatial resolution of 10s of arcmin, MHz bandwidths, and a time cadence ofa few seconds, while simultaneously but independently observing with LOFAR. Theimage timeseries is then monitored for short and bright radio transients. Ondetection of a transient, a low latency trigger will be generated for LOFAR,which can interrupt its schedule to carry out follow-up observations of thetrigger location at high sensitivity and resolutions. In this paper, wedescribe our heterogeneous, hierarchical design to manage the 240 Gbps raw datarate, and large scale computing to produce real-time images with minimumlatency. We discuss the implementation of the instrumentation, its performance,and scalability.
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