PULSAR DETECTION AT 87 GHZ

Pulsed radio emission at 87 GHz has been detected from the pulsar PSR B0355+54. The observed flux density of 0.5 +/- 0.2 mJy is, within the measurement errors, the same as measured previously at 43 GHz and is t hus higher than expected. However the errors are such that all the mea surements at frequencies higher than 1.2 GHz are just consistent with a single power law spectrum. A second pulsar, PSR B2021+51, with a rep orted excess of flux density at 43 GHz, has been observed but not dete cted. The resulting upper limit for the flux density provides little c onstraint on the form of its spectrum above 43 GHz.