A RADIO PULSAR IN SN1987A

A complex three-ring shaped structure has been reported extending some arcseconds around the SN1987A central spot by several authors. This s tructure is believed to arise when a thin shell of matter surrounding the supernova was illuminated by the initial extreme-ultra-violet flas h from the explosion of the progenitor In this view the two ring-shape d outer loops, similar to 3 '' in size, are interpreted as limb bright ening of an hourglass-shaped nebula surrounding the super nova, while the smaller central ring is located at the waist of the hourglass. Our explanation of the two external loops is different: keeping the hourg lass-shaped nebula scenario, we believe that these loops result from t he interaction of this nebula with a double beam of relativistic parti cles emitted by a young pulsar formed by the supernova.