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We present a systematic analysis of all archival  Chandra  observations of the soft gamma repeater SGR 0526−66. Our results show that the X‐ray flux of SGR 0526−66 decayed by about 20 per cent between 2000 and 2009. We employ physically motivated X‐ray spectral models and determine the effective temperature and the strength of the magnetic field at the surface as   kT = 0.354 +0.031  −0.024   keV and  G, respectively. We find that the effective temperature remains constant within the statistical uncertainties and attribute the decrease in the source flux to a decrease in the emitting radius. We also perform timing analysis to measure the evolution of the spin period and the period derivative over the 9‐year interval. We find a period derivative of  s s −1 , which allows us to infer the dipole magnetic field strength and compare it with the one determined spectroscopically. Finally, we compare the effective temperature of SGR 0526−66 with the expected cooling trends from magnetized neutron stars and suggest an initial magnetic field strength of 10 15 –10 16  G for the source.

On the cooling trend of SGR 0526−66