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To confirm faint Be/X-ray binary candidates from the XMM-Newton survey of theSmall Magellanic Cloud, we searched for X-ray outbursts in archival ROSATobservations. We found that RXJ0123.4-7321 was much brighter when detected withROSAT than seen 16 years later by XMM-Newton. We analysed the ROSATobservations and the OGLE I-band light curve of the optical counterpart toinvestigate the nature of the system. High long-term variability in the X-rayflux of a factor of ~150 was found between the ROSAT and XMM-Newton detections,indicating strong outburst activity during the ROSAT observations. The I-bandlight curve reveals long-term variability and regular outbursts with a periodof (119.9+-2.5) days indicating the orbital period of the binary system. Thelarge X-ray flux variations and the properties of the optical counterpartconfirm RXJ0123.4-7321 as a new Be/X-ray binary in the wing of the SmallMagellanic Cloud.

RXJ0123.4-7321, a Be/X-ray binary in the wing of the SMC