On the detectability of gravitational waves background produced by gamma ray bursts

In this letter we discuss a new strategy for the detection of gravitational radiation which is likely to be emitted by the cosmological gamma ray burs t. Robust and conservative estimates lead to the conclusion that the uncorr elated superimposition of bursts of gravitational waves can be detected by interferometric detectors like VIRGO or LIGO. The expected signal is predic ted to carry two very distinctive signatures: the cosmological dipole aniso tropy and a characteristic time scale in the auto correlation spectrum, whi ch might be exploited, perhaps with ad hoc modifications and/or upgrading o f the planned experiments, to confirm the non-instrumental origin of the si gnal.