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Pulsations from the high mass X-ray binary AXJ1910.7+0917 were discoveredduring Chandra observations performed in 2011 (Israel et al. 2016). We reporthere more details on this discovery and discuss the source nature. The periodof the X-ray signal is P=36200+/-110s, with a pulsed fraction, PF, of 63+/-4%.Given the association with a massive B-type companion star, we ascribe thislong periodicity to the rotation of the neutron star, making AXJ1910.7+0917 theslowest known X-ray pulsar. We report also on the spectroscopy of XMM-Newtonobservations that serendipitously covered the source field, resulting in anhighly absorbed (column density almost reaching 1e23cm-2), power law X-rayspectrum. The X-ray flux is variable on a timescale of years, spanning adynamic range >60. The very long neutron star spin period can be explainedwithin a quasi-spherical settling accretion model, that applies to lowluminosity, wind-fed, X-ray pulsars.

AX J1910.7+0917: the slowest X-ray pulsar