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IGR J18483−0311 was discovered with  INTEGRAL  in 2003 and later classified as a supergiant fast X‐ray transient. It was observed in outburst many times, but its quiescent state is still poorly known. Here, we present the results of  XMM–Newton ,  Swift  and  Chandra  observations of IGR J18483−0311. These data improved the X‐ray position of the source, and provided new information on the timing and spectral properties of IGR J18483−0311 in quiescence. We report the detection of pulsations in the quiescent X‐ray emission of this source, and give for the first time a measurement of the spin‐period derivative of this source. In IGR J18483−0311, the measured spin‐period derivative of  −(1.3 ± 0.3) × 10 −9  s s −1   likely results from light travel time effects in the binary. We compare the most recent observational results of IGR J18483−0311 and SAX J1818.6−1703, the two supergiant fast X‐ray transients for which a similar orbital period has been measured.

The supergiant fast X‐ray transient IGR J18483−0311 in quiescence: XMM–Newton , Swift and Chandra observations