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We report on INTEGRAL observations of last outbursts activi ty of the two transients SAXJ 1747.0-2853 and GRS 1747-312. These sources show spectral s ta e changes driven possibly by accretion instability phenomena. They are often in a quie scent state with a low luminosity of 1033 erg s−1 and abruptly show X-ray outbursts which consist of fast flux i ncrease up to a LX ∼ 1037−38 erg s−1 and a slower nearly exponential decay lasting weeks or month s. During the outburst the sources reveal spectral states transition s. INTEGRAL has detected two distinct outbursts from SAX J1747.0-2853 (in March 2004 and also in Fe bruary 2006) and one outburst for GRS 1747-312 in February 2006. Light curves and spectral an ysis have been performed with JEM-X and IBIS to show spectral state variations and to c ompare the sources behaviour. We report here INTEGRAL preliminary results on the outburst of March 2004 of the transient SAX J1747.0-2853 and the February 2006 outburst for GRS 1747-31 2. The outbursts were "soft" and the sources showed spectra extending up to 40 keV and 20 keV re spectively, modelled by a soft blackbody emission plus a power law or Comptonization compo nent.

INTEGRAL observations of the transient neutron stars SAX J1747.0-2853 and GRS 1747-312