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We report on the determination of astrometric, spin and orbital parametersfor PSR J1518+0204C, a "black widow" binary millisecond pulsar in the globularcluster M5. The accurate position and orbital parameters obtained from radiotiming allowed us to search for the optical companion. By using WFC3/HST imageswe identified a very faint variable star (m_F390W > 24.8, m_F606W > 24.3,m_F814W > 23.1) located at only 0.25" from the pulsar's timing position. Due toits strong variability, this star is visible only in a sub-sample of images.However, the light curve obtained folding the available data with the orbitalparameters of the pulsar shows a maximum at the pulsar inferior conjunction anda possible minimum at the pulsar superior conjunction. Furthermore, the shapeof the optical modulation indicates a heating process possibly due to thepulsar wind. This is the first identification of an optical companion to ablack widow pulsar in the dense stellar environment of a globular cluster.

Radio timing and optical photometry of the black widow system PSR J1518+0204C in the globular cluster M5