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We report the discovery of very strong, variable ( + 50 to –20 per cent) circular polarization in the ROSAT EUV source RE 1307 + 535 in the red (R band) spectral region. The amplitude and the peak value of the broad-band circular polarization are the largest observed so far in any astronomical object.Peer-reviewedPublisher Versio

Record circular polarization discovered in the shortest period magnetic cataclysmic variable, RE 1307 + 535