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We studied the timing and spectral properties of the Be/X-ray pulsar SwiftJ1626.6-5156 using the \emph{NICER} observations of its 2021 outburst. The mostimportant observation is the positive correlation of the centroid energy of thefundamental cyclotron line with the luminosity. This observation agrees withthe usual positive correlation of the centroid energy cyclotron line withluminosity in the sub-critical regime. The correlation between the twoquantities is verified using two different continuum models. The photon indexdecreases with an increase in flux. Thus, the spectrum is softer when the fluxis low, which may be due to a decrease in the optical depth of the accretioncolumn with a decrease in the flux.

Luminosity dependent cyclotron line in Swift J1626.6-5156