The Sunburst Arc: Direct Lyman α escape observed in the brightest known lensed galaxyT. E. Rivera-Thorsen, H. Dahle, M. Gronke, M. Bayliss, J. R. Rigby, R. Simcoe, R. Bordoloi, M. Turner and G. FureszA&A, 608 (2017) L4DOI: https://doi.org/10.1051/0004-6361/201732173