After a two years analysis on the emission spectra from a 2016 X-ray transient outburst in the black hole system U4 1630-47, obtained by three different independent space missions; Chandra/HEG, AstroSat and MAXI, the leader of the project Dr. Mayukh Pahari and collaborators could determine the spinning and mass of the BH. The estimated spinning rate is 92-95% the speed of light, with a mass of 5-10 M (million solar masses).

X