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We report on the optical identification of the neutron star burster EXO1745-248 in Terzan 5. The identification was performed by exploiting HST/ACSimages acquired in Director's Discretionary Time shortly after (approximately 1month) the Swift detection of the X-ray burst. The comparison between theseimages and previous archival data revealed the presence of a star thatcurrently brightened by ~3 magnitudes, consistent with expectations during anX-ray outburst. The centroid of this object well agrees with the position, inthe archival images, of a star located in the Turn-Off/Sub Giant Branch regionof Terzan 5. This supports the scenario that the companion should has recentlyfilled its Roche Lobe. Such a system represents the pre-natal stage of amillisecond pulsar, an evolutionary phase during which heavy mass accretion onthe compact object occurs, thus producing X-ray outbursts and re-acceleratingthe neutron star.

Probing the MSP prenatal stage: the optical identification of the X-ray burster EXO 1745-248 in Terzan 5