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Imaging atmospheric Cherenkov telescopes (IACTs) such as the MajorAtmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes endeavor to reachthe lowest possible energy threshold. In doing so the trigger system is a keyelement. Reducing the trigger threshold is hampered by the rapid increase ofaccidental triggers generated by ambient light, the so-called Night SkyBackground (NSB). In this paper we present a topological trigger, dubbedTopo-trigger, which rejects events on the basis of their relative orientationin the telescope cameras. We have simulated and tested the trigger selectionalgorithm in the MAGIC telescopes. The algorithm was tested using MonteCarlosimulations and shows a rejection of 85% of the accidental stereo triggerswhile preserving 99 % of the gamma rays. A full implementation of this triggersystem would achieve an increase in collection area between 10 and 20% at theenergy threshold. The analysis energy threshold of the instrument is expectedto decrease by ~8 %. The selection algorithm was tested on real MAGIC datataken with the current trigger configuration and no $\gamma$-like events werefound to be lost.

The Topo-trigger: a new concept of stereo trigger system for imaging atmospheric Cherenkov telescopes