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Swift J0549.7-6812 is an Be/X-ray binary system (BeXRB) in the LargeMagellanic Cloud (LMC) exhibiting a 6s pulse period. Like many such systems thevariable X-ray emission is believed to be driven by the underlying behaviour ofthe mass donor Be star. In this paper we report on X-ray observations of thebrightest known outburst from this system which reached a luminosity of 8 x10^37 erg/s. These observations are supported by contemporaneous opticalphotometric observations, the first reported optical spectrum, as well asseveral years of historical data from OGLE and GAIA. The latter stronglysuggest a binary period of 46.1d. All the observational data indicate thatSwift J0549.7-6812 is a system that spends the vast majority of its time inX-ray quiescence, or even switched off completely. This suggests thatoccasional observations may easily miss it, and many similar systems, andthereby underestimate the massive star evolution numbers for the LMC.

A rare outburst from the stealthy BeXRB system Swift J0549.7-6812