Not all neutron stars are created equal. Some, for reasons that are not totally understood, fall under the classification of "magnetars," which take the already-astounding field of an ordinary neutron star and multiply it by about 1,000 times. Even parked halfway between the Earth and the moon, a magnetar could still strip the info from your credit card.
Scientists aren't sure why magnetars are so much stronger than ordinary neutrons stars, but astronomers are finding more of them all the time. When the extraordinary magnetic field begins to slow the star's spinning, it releases intense bursts of energy in X-ray wavelengths, visible to NASA's X-ray observatories.