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We present the results of a LIGO search for gravitational waves (GWs)associated with GRB 051103, a short-duration hard-spectrum gamma-ray burst(GRB) whose electromagnetically determined sky position is coincident with thespiral galaxy M81, which is 3.6 Mpc from Earth. Possible progenitors forshort-hard GRBs include compact object mergers and soft gamma repeater (SGR)giant flares. A merger progenitor would produce a characteristic GW signal thatshould be detectable at the distance of M81, while GW emission from an SGR isnot expected to be detectable at that distance. We found no evidence of a GWsignal associated with GRB 051103. Assuming weakly beamed gamma-ray emissionwith a jet semi-angle of 30 deg we exclude a binary neutron star merger in M81as the progenitor with a confidence of 98%. Neutron star-black hole mergers areexcluded with > 99% confidence. If the event occurred in M81 our findingssupport the the hypothesis that GRB 051103 was due to an SGR giant flare,making it the most distant extragalactic magnetar observed to date.

Implications For The Origin Of GRB 051103 From LIGO Observations