  The Fermilab Short Baseline Neutrino (SBN) program aims to observe and
reconstruct thousands of neutrino-argon interactions with its three detectors
(SBND, MicroBooNE and ICARUS-T600), using their hundred of tonnes Liquid Argon
Time Projection Chambers to perform a rich physics analysis program, in
particular focused in the search for sterile neutrinos. Given the relatively
shallow depth of the detectors, the continuos flux of cosmic ray particles
which crossing their volumes introduces a constant background which can be
falsely identified as part of the event of interest. Here we present the Cosmic
Ray Tagger (CRT) system, a novel technique to tag and identify these crossing
particles using scintillation modules which measure their time and coordinates
relative to events internal to the neutrino detector, mitigating therefore
their effect in the event tracking reconstruction.
