  Context: AXJ1845.0-0433 was discovered by ASCA in 1993 during fast outburst
activity characterized by several flares on short timescales. Up to now, the
source was not detected again by any X-ray mission. Its optical counterpart is
suggested to be an O9.5I supergiant star, which is the only remarkable object
found inside the ASCA error box. Aims: To detect and characterize new fast
outbursts of AXJ1845.0-0433 and confirm its supergiant HMXB nature, using
INTEGRAL and archival Swift XRT observations. Methods: We performed an analysis
of INTEGRAL IBIS and JEM-X data with OSA 5.1 as well as an analysis of archive
Swift XRT data. Results: We report on fast flaring activity from the source on
timescales of a few tens of minutes, the first to be reported since its
discovery in 1993. Two outbursts have been detected by INTEGRAL (Apr 2005 and
Apr 2006) with similar peak fluxes and peak luminosities of 80 mCrab and
9.3X10^35 erg s^-1 (20--40 keV), respectively. Two other outbursts were
detected by Swift XRT on Nov 2005 and Mar 2006. The refined Swift XRT position
of AXJ1845.0-0433 confirms its association with the supergiant star previously
proposed as optical counterpart. Conclusions: Our INTEGRAL and Swift results
fully confirm the supergiant HMXB nature of AXJ1845.0-0433 which can therefore
be classified as a supergiant fast X-ray transient. Moreover they provide for
the first time evidence of its recurrent fast transient behaviour.
