A radio-microlensing caustic crossing in B1600+434?

L. V. E. Koopmans, A. G. de Bruyn, J. Wambsganss +1

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-f…