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We present results of a search for periodic gravitational wave signals withfrequency between 20 and 400 Hz, from the neutron star in the supernova remnantG347.3-0.5, using LIGO O2 public data. The search is deployed on the volunteercomputing project Einstein@Home, with thousands of participants donatingcompute cycles to make this endevour possible. We find no significant signalcandidate and set the most constraining upper limits to date on the amplitudeof gravitational wave signals from the target, corresponding to deformationsbelow $10^{-6}$ in a large part of the band. At the frequency of best strainsensitivity, near $166$ Hz, we set 90\%\ confidence upper limits on thegravitational wave intrinsic amplitude of $h_0^{90\%}\approx7.0\times10^{-26}$. Over most of the frequency range our upper limits are afactor of 20 smaller than the indirect age-based upper limit.

Results from an Einstein@Home search for continuous gravitational waves from G347.3 at low frequencies in LIGO O2 data