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We report the detection of off-pulse emission from two long period pulsarsPSR B0525+21 and PSR B2045-16 using the Giant Metrewave Radio Telescope (GMRT).We recorded high time resolution interferometric data at 325 MHz and gated thedata offline to separate the on- and off-pulse sections of the pulsar. Onimaging the two temporal sections separately, we detected a point source in theoff-pulse images of both the pulsars coincident with the pulsar locations inthe on-pulse images. The long periods (3.75 and 1.96 s respectively) and lowspin-down energies (E ~ 10exp(31) erg s-1) of the two pulsars argue against apulsar wind nebula (PWN) origin for the off-pulse emission. The derivedestimates of the ISM particle density required to drive a PWN do not supportsuch an interpretation. A magnetospheric origin for the off-pulse emissionraises questions regarding the location of the emission region, which is animportant input into pulsar emission models.

Detection of off-pulse emission from PSR B0525+21 and PSR B2045-16