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We present a search for gravitational arcs in a sample of X-ray luminous,medium redshift clusters of galaxies. The sample of clusters is calledARCRAIDER, is based on the ROSAT Bright Survey (RBS) and fulfills the followingcriteria: (a) X-ray luminosity Lx>=0.5x10^45erg/s (0.5-2keV band), (b) redshiftrange 0.1<=z<=0.52, (c) classified as clusters in the RBS, (d) not a member ofthe Abell catalogue and, finally, (e) visible from the ESO sites LaSilla/Paranal (declination \delta<=20deg). In total we found more than 35(giant) arc/arclet candidates, including a possible radial arc, onegalaxy-galaxy lensing event and a possible quasar triple image in 14 of the 21clusters of galaxies. Hence 66% of the sample members are possible lenses.

ARCRAIDER II: Arc search in a sample of non-Abell clusters