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We report the quasi-simultaneous INTEGRAL, SWIFT, and NuSTAR observationsshowing spectral state transitions in the neutron star low mass X-ray binary1RXS J180408.9-342058 during its 2015 outburst. We present results of theanalysis of high-quality broad energy band (0.8-200 keV) data in threedifferent spectral states: high/soft, low/very-hard, and transitional state.The broad band spectra can be described in general as the sum of thermalComptonization and reflection due to illumination of an optically-thickaccretion disc. During the high/soft state, blackbody emission is generatedfrom the accretion disc and the surface of the neutron star. This emission,measured at a temperature of kTbb ~1.2 keV, is then Comptonized by a thickcorona with an electron temperature of ~2.5 keV. For the transitional andlow/very-hard state, the spectra are successfully explained with emission froma double Comptonizing corona. The first component is described by thermalComptonization of seed disc/neutron-star photons (kTbb ~1.2 keV) by a coldcorona cloud with kT e ~8-10 keV, while the second one originates from lowertemperature blackbody photons (kTbb~0.1 keV) Comptonized by a hot corona(kTe~35 keV). Finally, from NuSTAR observations, there is evidence that thesource is a new clocked burster. The average time between two successive X-raybursts corresponds to ~7.9 ks and ~4.0 ks when the persistent emissiondecreases by a factor ~2, moving from very hard to transitional state. Theaccretion rate and the decay time of the X-ray bursts longer than ~30 s suggestthat the thermonuclear emission is due to mixed H/He burning triggered bythermally unstable He ignition.

Quasi-simultaneous Integral, Swift, And Nustar Observations Of The New X-ray Clocked Burster 1rxsj180408.9-342058