  We present the radio light curves of lensed images of the gravitational lens
B1422+231. The observations have been carried out using the VLA at 8.4 and 15
GHz over a period of 197 days. We describe a method to estimate the time delay
from the observed light curves. Using this method, our cross-correlation
analysis shows that the time delay between images B and A is 1.5$\pm$1.4d,
between A and C is 7.6$\pm$2.5d, between B and C is 8.2$\pm$2.0d. When applied
to other lensed systems with measured time delays our new method gives
comparable results.

Astrophysics