  We present new results from INTEGRAL and Swift observations of the hitherto
poorly studied and unidentified X-ray source XTE J1906+090. A bright hard X-ray
outburst (luminosity of $\sim$10$^{36}$ erg s$^{-1}$ above 20 keV) has been
discovered with INTEGRAL observations in 2010, this being the fourth outburst
ever detected from the source. Such events are sporadic, the source duty cycle
is in the range (0.8--1.6)% as inferred from extensive INTEGRAL and Swift
monitoring in a similar hard X-ray band. Using five archival unpublished
Swift/XRT observations, we found that XTE J1906+090 has been consistently
detected at a persistent low X-ray luminosity value of $\sim$10$^{34}$ erg
s$^{-1}$, with limited variability (a factor as high as 4). Based on our
findings, we propose that XTE J1906+090 belongs to the small and rare group of
persistent low luminosity Be X-ray Binaries.
