Multiwavelength studies of PSR J1420-6048, a young pulsar in the Kookaburra

We present X-ray, radio, and infrared observations of the 68 ms pulsar PSR J1420-048 and its surrounding nebula, a possible counterpart of the gamma - ray source GeV J1417-6100/3EG J1420-6038. Pulsed X-ray emission at the radi o period is marginally detected by ASCA from a source embedded in the hard- spectrum X-ray nebula AX J1420.1-6049. At radio wavelengths, the pulsar is found to be strongly linearly and circularly polarized, and the polarizatio n sweep is measured. A comparison of high-resolution Australia Telescope Co mpact Array radio imaging of the Kookaburra's upper wing (G313.6+0.3), whic h contains the pulsar and the X-ray nebula, with infrared images suggests t he radio emission is partly nonthermal.