The source is detected by IBIS/ISGRI up to an energy of about 200 keV. The estimated ISGRI flux is 143+/-2 mCrab in the 18-40 keV energy band and 166+/-2 mCrab in the 40-100 keV energy band. The fluxes estimated from JEM-X are 60+/-4 mCrab in the 3-10 keV energy band and 104+/-8 mCrab in the 10-20 keV energy band.
Its averaged broad-band (3-200 keV) spectrum, extracted by using all available ISGRI and JEM-X data (total exposure time 12.6 ks), could be roughly described with a cut-off power-law model. The measured photon index is 1.4+/-0.2 and the energy cut-off is 90(-20+40) keV (we fixed the absorption column density to the Galactic value expected in the direction of the source, i.e. 0.8E22 cm^-2). The 3-200 keV X-ray flux derived from the spectral fit is 5E-9 ergs/cm^2/s (not corrected for absorption).
This spectral shape is reminiscent of that displayed by black-hole candidates in the canonical hard state.
Further observations of the source with INTEGRAL are planned for March 28.
|Publication date||20 Mar 2014|
|Publication status||Published - 20 Mar 2014|
|Series||The Astronomer's telegram|
- Black hole