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Jarvis, M. Mevius, P. N. Best, R. Cassano, R. J. van Weeren, R. Pizzo, R. P. Kraft, S. S. Murray, S. S. Sridhar, S. van der Tol, T. Ensslin, T. J. Dijkema, T. W. Shimwell, W. A. Dawson, W. L. Williams, W. R. Forman","submitted_at":"2016-01-20T21:00:00Z","abstract_excerpt":"We present 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, when combined with VLA, GMRT, and Chandra X-ray data, provide new information about the nature of cluster merger shocks and their role in re-accelerating relativistic particles. 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