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The extragalactic microlensing scenario for natural wormholes is examined. Itis shown that the main features of wormhole lensing events upon the light ofdistant Active Galactic Nuclei (AGNs) are similar to some types of alreadyobserved Gamma Ray Bursts (GRBs). Using recent satellite data on GRBs, an upperlimit to the negative mass density -- ${\cal O} (10^{-36})$ g cm$^{-3}$ --under the form of wormhole-like objects is presented.Comment: extended version, additions on GRB physics, background sources and  cosmological consequences. Two ps figures. Accpeted for publication in Phys.  Rev.

Might some gamma ray bursts be an observable signature of natural wormholes?