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Many neutron stars (NSs) and runaway stars apparently come from the sameregions on the sky. This suggests that they share the same birth places, namelyassociations and clusters of young massive stars. To identify NS birth places,we attempt to and NS-runaway pairs that could be former companions that weredisrupted in a supernova (SN). The remains of recent (<few Myr) nearby (< 150pc) SNe should still be identifiable by observing the emission of rareradioisotopes such as 26Al and 60Fe that can also be used as additionalindicators to confirm a possible SN event. We investigated the origin of theisolated NS RXJ1605.3+3249 and found that it was probably born ~100 pc far fromEarth 0.45 Myr ago in the extended Corona-Australis or Octans associations, orin Sco OB4 ~1 kpc 3.5 Myr ago. A SN in Octans is supported by theidentification of one to two possible former companions the runaway stars HIP68228 and HIP 89394, as well as the appearance of a feature in the gamma rayemission from 26Al decay at the predicted SN place. Both, the progenitor massesestimated by comparison with theoretical 26Al yields as well as derived fromthe life time of the progenitor star, are found to be ~11MSun.

Neutron stars from young nearby associations the origin of RXJ1605.3+3249