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Context: The transient hard X-ray source IGR J11321-5311 was discovered byINTEGRAL on June 2005, during observations of the Crux spiral arm. To date,this is the only detection of the source to be reported by any X/gamma-raymission. Aims: To characterize the behaviour and hence the nature of the sourcethrough temporal and spectral IBIS analysis. Methods: Detailed spectral andtemporal analysis has been performed using standard INTEGRAL software OSAv.5.1. Results: To date, IGR J11321-5311 has been detected only once. It wasactive for about 3.5 hours, a short and bright flare lasting about 1.5 hours isevident in the IBIS light curve. It reached a peak flux of about 80 mCrab or2.2x10E-9 erg cmE-2 sE-1 (20--300 keV),corresponding to a peak luminosity of1.1x10E37 erg sE-1 (assuming a distance of 6.5 kpc). During the outburst, thesource was detected with a significance of 18 sigma (20--300 keV) and 8 sigma(100--300 keV). The spectrum of the total outburst activity (17--300 keV) isbest fitted by the sum of a power law (Gamma=0.55+/-0.18) plus a black body(kT=1.0{+0.2}_{-0.3} keV), with no evidence for a break up to 300 keV. Aspectral analysis at Science Window level revealed an evident hardening of thespectrum through the outburst. The IBIS data were searched for pulsations withno positive result. Conclusions: The X-ray spectral shape and the flaringbehaviour favour the hypothesis that IGR J11321-5311 is an Anomalous X-rayPulsar, though a different nature can not be firmly rejected at the presentstage.

INTEGRAL high energy detection of the transient IGR J11321-5311