Upper limits on the pulsed radio emission from the Geminga pulsar at 35 & 327 MHz

Abstract

We report here our observations at 35 MHz and 327 MHz made in the direction of the 〉~mma-Ray pulsar Geminga. Based on the observed absence of any significant pulsed emission from this source above our detection thresholds at the two frequencies, we obtain useful upper-limits for the average flux to be 75-100 mJy at 35 MHz, and 0.2-0.3 mJy at 327 MHz. We discuss a few possible reasons for the ``radio-quiet'' nature of this pulsar at frequencies other than around 100 MHz.