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The Chandra X-Ray Observatory observed the Crab pulsar using the Low-Energy Transmission Grating with the High-Resolution Camera. Time-resolved zeroth-order images reveal that the pulsar emits X-rays at all pulse phases. Analysis of the flux at minimum-most likely nonthermal in origin-places an upper limit (T ! ϱ ) on the surface temperature of the underlying neutron star. In addition, analysis of the pulse profile 2.1 MK establishes that the error in the Chandra-determined absolute time isdoi:10.1086/321718 fatcat:haixbv3k7zbjtj2q6jwbepzv2e