@article{KoopmansBruynWambsganssetal.2001,
  author    = {Koopmans, L. V. E. and Bruyn, A. G. and Wambsganß, Joachim and Fassnacht, C. D.},
  title     = {A radio-microlensing caustic crossing in B1600+434?},
  isbn      = {1-538-81076-5},
  year      = {2001},
  abstract  = {First, we review the current status of the detection of strong `external' variability in the CLASS gravitational B1600+434, focusing on the 1998 VLA 8.5-GHz and 1998/9 WSRT multi-frequency observations. We show that this data can best be explained in terms of radio-microlensing. We then proceed to show some preliminary results from our new multi-frequency VLA monitoring program, in particular the detection of a strong feature (~30\%) in the light curve of the lensed image which passes predominantly through the dark-matter halo of the lens galaxy. We tentatively interpret this event, which lasted for several weeks, as a radio-microlensing caustic crossing, i.e. the superluminal motion of a micro-arcsec-scale jet-component in the lensed source over a single caustic in the magnification pattern, that has been created by massive compact objects along the line-of-sight to the lensed image.},
  language  = {en}
}