The young pulsar PSR B0540-69.3 and its synchrotron nebula in the optical and X-rays N. I. Serafimovich, Yu. A. Shibanov, P. Lundqvist and J. Sollerman A&A, 425 3 (2004) 1041-1060 Published online: 28 September 2004 DOI: 10.1051/0004-6361:20040499