We present an INTEGRAL data analysis of the X-ray transient SAX J2103.5+4545 during two outbursts detected in December 2002 .
The INTEGRAL coordinates and error circle agree with the position of the recently proposed optical counterpart .
A power-law plus cut-off model provided a good fit to the 4–150 keV spectrum yielding a photon index of 1.0 \pm 0.1 , a cut-off energy E _ { cut } = 7.6 \pm 2.0 keV and a folding energy E _ { fold } = 30.9 \pm 2.5 keV .
The X-ray luminosity in the 4-150 keV energy range was found to be 6.0 \times 10 ^ { 36 } erg s ^ { -1 } , assuming a distance of 6.5 kpc .
This luminosity , together with the derived photon index , indicate that the source is in a bright state .
A 354.9 \pm 0.5 second pulse period is measured .
This value is significantly smaller than previous measurements , indicating a long-term spin-up episode .