  PSR B0628-28 is a radio pulsar which was first detected in the X-ray band by
ROSAT and then later observed with Chandra and XMM-Newton. The Chandra
observation yielded an X-ray luminosity two orders of magnitude higher than
what is expected for spin-powered pulsars, also there were no pulsations
detected. The XMM-Newton observation, however, reveals pulsations at the
expected radio period, P=1.244 s. The simultaneously analyzed spectra also
gives a luminosity (in cgs) Log Lx=30.34, which is ~350 times greater than what
would be expected from the correlation between Lx-Edot.
