SIMBAD references

We have analysed the Swift data relevant to the high-mass X-ray binary Swift J1816.7-1613. The timing analysis of the Burst Alert Telescope survey data unveiled a modulation at a period of P0 = 118.5±0.8 d, which we interpret as the orbital period of the X-ray binary system. The modulation is the result of a sequence of bright flares, lasting ∼ 30 d, separated by long quiescence intervals. This behaviour is suggestive of a Be binary system, where periodic or quasi-periodic outbursts are the consequence of an enhancement of the accretion flow from the companion star at the periastron passage. The position of Swift J1816.7-1613 on the Corbet diagram strengthens this hypothesis. The broad-band 0.2-150keV spectrum is well modelled with a strongly absorbed power law with a flat photon index Γ ∼ 0.2 and a cut-off at ∼ 10keV.