  IGR J18219-1347 is a hard X-ray source discovered by INTEGRAL in 2010. We
have analyzed the X-ray emission of this source exploiting the BAT survey data
up to March 2012 and the XRT data that include also an observing campaign
performed in early 2012. The source is detected at a significance level of ~14
standard deviations in the 88-month BAT survey data, and shows a strong
variability along the survey monitoring, going from high intensity to quiescent
states. A timing analysis on the BAT data revealed an intensity modulation with
a period of 72.46 days. The significance of this modulation is about 7 standard
deviations in Gaussian statistics. We interpret it as the orbital period of the
binary system. The light curve folded at P_0 shows a sharp peak covering ~30%
of the period, superimposed to a flat level roughly consistent with zero. In
the soft X-rays the source is detected only in 5 out of 12 XRT observations,
with the highest recorded count rate corresponding to a phase close to the BAT
folded light curve peak. The long orbital period and the evidence that the
source emits only during a small fraction of the orbit suggests that the IGR
J18219-1347 binary system hosts a Be star. The broad band XRT+BAT spectrum is
well modeled with a flat absorbed power law with a high energy exponential
cutoff at ~11 keV.
