Peculiar Pulse Burst in PSR 1237 + 25

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GENERAL features of the short term variations in pulsars are remarkably steady. It has been found1, for example, that PSRs 1919 + 21 and 2016 + 28 (AP2015) exhibit a marching subpulse phenomenon, and this effect has since been detected in other pulsars. Other pulsars such as PSRs 0950 + 08 and 1929 + 10 show no such obvious correlation from pulse to pulse, but do have characteristic statistical properties on the same time-scale. Pulsar 0950 + 08 is very erratic, often showing 100 per cent modulation of the pulse energy over a single pulse period. On the other hand, 1929 + 10 has a pulse to pulse modulation of only 50 per cent with the exception of null pulses2 which recur regularly. Thus the characteristic short-term variations are an additional steady parameter of each pulsar which deserves to be considered along with the period, pulse shape, polarization properties and spectrum as a property of the source. The short-term variations of PSR 1237 + 25 have been described in detail in two earlier papers2,3. This communication describes a peculiar change of mode that occurs infrequently in sequences of pulses from 1237 + 25.

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