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The key point of studying AXPs/SGRs (anomalous X-ray pulsars/soft gamma-rayrepeaters) is relevant to the energy budget. Historically, rotation was thoughtto be the only free energy of pulsar until the discovery of accretion power inX-ray binaries. AXPs/SGRs could be magnetars if they are magnetism-powered, butwould alternatively be quark-star/fallback-disk systems if more and moreobservations would hardly be understood in the magnetar scenario.

Is magnetar a fact or fiction to us?