  A search for pulsations from the Be X-ray binary SAX J2239.3+6116, through
observations with the Narrow Field Instruments on BeppoSAX and the Proportional
Counter Array on RXTE, yielded the clear presence of a 1247 s coherent
oscillation. Given the fairly high X-ray luminosity on previous occasions (up
to a few times 10^36 erg/s in 2 to 28 keV), the oscillation must be due to the
spin of a neutron star. Assuming that the 262 day recurrence time is the
orbital period, SAX J2239.3+6116 has both the longest orbital period and the
longest pulse period of 24 Be X-ray binaries with measured orbital periods.
