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Since its discovery as a pulsar in 2000, the central compact object (CCO) 1E1207.4-5209 in the supernova remnant PKS 1209-51/52 had been a stable 0.424 srotator with an extremely small spin-down rate and weak (Bs ~ 9E10 G) surfacedipole magnetic field. In 2016 we observed a glitch from 1E 1207.4-5209 of atleast Delta f/f = (2.8+/-0.4)E-9, which is typical in size for the generalpulsar population. However, glitch activity is closely correlated withspin-down rate fdot, and pulsars with fdot as small as that of 1E 1207.4-5209are never seen to glitch. Unlike in glitches of ordinary pulsars, there mayhave been a large increase in fdot as well. The thermal X-ray spectrum of 1E1207.4-5209, with its unique cyclotron absorption lines that measure thesurface magnetic field strength, did not show any measurable change after theglitch, which rules out a major disruption in the dipole field as a cause orresult of the glitch. A leading theory of the origin and evolution of CCOs,involving prompt burial of the magnetic field by fall-back of supernova ejecta,might hold the explanation for the glitch.

The First Glitch in a Central Compact Object Pulsar: 1E 1207.4-5209