Maccarone et al. present evidence that the X-ray source W41 in the globular cluster 47 Tucanae, long considered to be an X-ray source powered by coronal activity, is actually a redback pulsar binary. “Redback” pulsars are rapidly rotating neutron stars in a tight binary system that slowly “cannibalize” their companion star. The source continually shows an X-ray luminosity that is well in excess of the coronal saturation limit for active binaries in quiescence, but is consistent with the intrabinary shock observed in redback pulsars. In addition, using deep ATCA data, the team show that W41 is a faint (9.8 ± 1.4µJy at 5.5 GHz), steep spectrum radio continuum source, as expected for a pulsar. Light curve modelling of Hubble Space Telescope photometry shows evidence for ellipsoidal modulation a half-solar-mass secondary around an invisible companion, also consistent with the redback interpretation. The precise position of W41, along with its well-measured 10.4-hr orbital period, should enable it to be matched to a newly-discovered radio pulsar in future data. This result shows that close pulsar binaries are still hiding, misclassified among active binaries, even in well-studied clusters like 47 Tuc. The image above shows at left, the summed X-ray image from Chandra, with the large red circle representing the core radius, and the smaller circle a 1 arcsecond circle around W41. The image at right is the ATCA image of 47 Tuc showing the core radius and the location of W41.