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The Fermi Large Area Telescope (LAT) discovered the time signature of aradio-silent pulsar coincident with RX J0007.0+7302, a plerion-like X-raysource at the centre of the CTA 1 supernova remnant. The inferred timingparameters of the gamma-ray pulsar PSR J0007+7303 (P=315.8 ms; dot{P}\sim3.610^{-13} s s^{-1}) point to a Vela-like neutron star, with an age comparable tothat of CTA 1. The PSR J0007+7303 low distance (\sim 1.4 kpc), interstellarabsorption (A_V\sim 1.6), and relatively high energy loss rate (dot{E} \sim4.510^{35} erg s^{-1}), make it a suitable candidate for an optical follow-up.Here, we present deep optical observations of PSR J0007+7303. The pulsar is notdetected in the Gran Telescopio Canarias (GTC) images down to a limit of r'\sim27.6 (3 sigma), the deepest ever obtained for this pulsar, while WilliamHerschel Telescope (WHT) images yield a limit of V \sim 26.9. Our r'-band limitcorresponds to an optical emission efficiency \eta_{opt}= L_{opt}/dot{E} < 9.410^{-8}. This limit is more constraining than those derived for other Vela-likepulsars, but is still above the measured optical efficiency of the Vela pulsar.We compared the optical upper limits with the extrapolation of the XMM-NewtonX-ray spectrum and found that the optical emission is compatible with theextrapolation of the X-ray power-law component, at variance with what isobserved, e.g. in the Vela pulsar.

Deep optical observations of the gamma-ray pulsar PSR J0007+7303 in the CTA 1 supernova remnant