The coalescence rate of two neutron stars ( NS ) is revisited .
For estimation of the number of bound NS-NS and the probability of their coalescence in a timescale \tau , the galactic star formation history , directly derived from observations , and the evolution of massive stars are considered .
The newly established galactic merging rate is ( 1.7 \pm 1.0 ) \times 10 ^ { -5 } yr ^ { -1 } , while the local merging rate , including the contribution of elliptical galaxies , is about a factor of two higher , 3.4 \times 10 ^ { -5 } yr ^ { -1 } .
Using the present data basis on galaxy distribution in the local universe and the expected sensitivity of the first generation of laser beam interferometers , we estimate that one event should occur every 125 years for LIGO and one event each 148 years for VIRGO .
The situation is considerably improved for advanced-LIGO since we predict that 6 events per year should be detected whereas for a recently proposed VIRGO new configuration , the event rate might increase up to 3 events every two years .