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Discovered in 1996 by  BeppoSAX  during a single type‐I burst event, SAX J 1753.5− 2349 was classified as ‘burst‐only’ source. Its persistent emission, either in outburst or in quiescence, had never been observed before 2008 October, when SAX J 1753.5− 2349 was observed for the first time in outburst. Based on  INTEGRAL  observations, we present here the first high‐energy emission study (above 10 keV) of a so‐called ‘burst‐only’. During the outburst, the SAX J 1753.5− 2349 flux decreased from 10 to 4 mCrab in 18–40 keV, while it was found being in a constant low/hard spectral state. The broad‐band (0.3–100 keV) averaged spectrum obtained by combining  INTEGRAL /IBIS and  Swift /XRT data has been fitted with a thermal Comptonization model and an electron temperature ≳24 keV inferred. However, the observed high column density does not allow the detection of the emission from the neutron star surface. Based on the whole set of observations of SAX J 1753.5− 2349, we are able to provide a rough estimate of the duty cycle of the system and the time‐averaged mass‐accretion rate. We conclude that the low to very low luminosity of SAX J 1753.5− 2349 during outburst may make it a good candidate to harbour a very compact binary system.

Unveiling the hard X‐ray spectrum from the ‘burst‐only’ source SAX J1753.5−2349 in outburst ★