  It is considered the problem of localization on the plane of two radioactive
sources by K detectors. Each detector records a realization of inhomogeneous
Poisson process and the intensity function of this process is a sum of a signal
arriving from the sources and the constant Poisson noise of known intensity.
The time of the beginning of emissions of two sources is known and the main
problem is the estimation of the position of the sources. The properties of the
MLE and Bayessian estimators are described in the asymptotics of large signals
in three situations of different regularities of the fronts of the signals:
smooth, cusp-type and change-point type.
