Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS

Understand

We report on a recent bright outburst from the new X-ray binary transient MAXI J1631-479, observed in January 2019.

• In particular, we present the 30-200 keV analysis of spectral transitions observed with INTEGRAL/IBIS during its Galactic Plane monitoring program.
• In the MAXI and BAT monitoring period, we observed two different spectral transitions between the high/soft and low/hard states.
• The INTEGRAL spectrum from data taken soon before the second transition, is best described by a Comptonised thermal component with an electron temperature of 30 keV and a high luminosity value of 3x10^38 erg/s in 2-200 keV energy range (assuming a distance of 8 kpc).