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In a publication led by Dr. Reinout van Weeren (Harvard) in collaboration with scientists from Hamburg, we have presented deep LOFAR observations between 120 -181 MHz of the "Toothbrush" (RX J0603.3+4214), a cluster that contains one of the brightest radio relic sources known. Our LOFAR observations exploit a new and novel calibration scheme to probe 10 times deeper than any previous study in this relatively unexplored part of the spectrum. The LOFAR observations provide new information about the nature of cluster merger shocks and their role in re-accelerating relativistic particles. The paper will be published in The Astrophysical Journal (http://arxiv.org/pdf/1601.06029.pdf)