An analysis of the high-energy emission from IGR J16393 - 4643 ( = AX J1639.0 - 4642 ) is presented using data from INTEGRAL and XMM-Newton .
The source is persistent in the 20–40 keV band at an average flux of 5.1 \times 10 ^ { -11 } ergs cm ^ { -2 } s ^ { -1 } , with variations in intensity by at least an order of magnitude .
A pulse period of 912.0 \pm 0.1 s was discovered in the ISGRI and EPIC light curves .
The source spectrum is a strongly-absorbed ( N _ { \mathrm { H } } = ( 2.5 \pm 0.2 ) \times 10 ^ { 23 } cm ^ { -2 } ) power law that features a high-energy cutoff above 10 keV .
Two iron emission lines at 6.4 and 7.1 keV , an iron absorption edge \gtrsim 7.1 keV , and a soft excess emission of 7 \times 10 ^ { -15 } ergs cm ^ { -2 } s ^ { -1 } between 0.5–2 keV , are detected in the EPIC spectrum .
The shape of the spectrum does not change with the pulse .
Its persistence , pulsation , and spectrum place IGR J16393 - 4643 among the class of heavily-absorbed HMXBs .
The improved position from EPIC is R.A. ( J2000 ) = 16 ^ { \mathrm { h } } 39 ^ { \mathrm { m } } 05.4 ^ { \mathrm { s } } and Dec . = -46 ^ { \circ } 42 ^ { \prime } 12 ^ { \prime \prime } ( 4 ^ { \prime \prime } uncertainty ) which is compatible with that of 2MASS J16390535 - 4642137 .