Ultra Fast Pulsar . ... ASCA Explanation: Pulsars are rotating neutron stars , born in the violent crucibles of supernova explosions . ... Rotating at 33 times a second, its radiation energizes the surrounding gaseous stellar debris . ... Located in the Large Magellanic Cloud (LMC) , X-ray pulses from this newly discovered pulsar, in the supernova remnant N157B , indicate an even faster rotation rate - 62 times a second - making it the fastest known pulsar associated with a supernova remnant . ...