Implications For The Origin Of GRB 051103 From LIGO Observations

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Abstract:: 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 the spiral galaxy M81, which is 3.6 Mpc from Earth. Possible progenitors for short-hard GRBs include compact object mergers and soft gamma repeater (SGR) giant flares. A merger progenitor would produce a characteristic GW signal that should be detectable at the distance of M81, while GW emission from an SGR is not expected to be detectable at that distance. We found no evidence of a GW signal associated with GRB 051103. Assuming weakly beamed gamma-ray emission with a jet semi-angle of 30 deg we exclude a binary neutron star merger in M81 as the progenitor with a confidence of 98%. Neutron star-black hole mergers are excluded with > 99% confidence. If the event occurred in M81 our findings support the the hypothesis that GRB 051103 was due to an SGR giant flare, making it the most distant extragalactic magnetar observed to date.

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Fig 1: Image of M81 group from Hurley et al (2010) (m81_from_Hurley10.pdf, file is not accessible)
Fig 2: Exclusion confidence for source in M18 (051103_jetexclusions_PRODUCTION.txt, file is not accessible)
Fig 3 data: 90% confidence distance exclusions (051103_distexclusions_PRODUCTION.txt, file is not accessible)

Keywords:: gamma-ray bursts -- gravitational waves compact object mergers soft gamma-ray repeaters

Publication Information:: Posting on arXiv: 1201.4413, http://arxiv.org/abs/1201.4413
Paper synopsis for students/teachers/public: http://www.ligo.org/science/Publication-GRB051103/index.php

LIGO Document P1000097-v12