  The paper derives the theoretical Cramer-Rao lower bound for parameter
estimation of a source (of emitting energy, gas, aerosol), monitored by a
network of sensors providing binary measurements. The theoretical bound is
studied in the context of a source of a continuous release in the atmosphere of
hazardous gas or aerosol. Numerical results show a good agreement with the
empirical errors, obtained using an MCMC parameter estimation technique.
