The Spin of the Near-Extreme Kerr Black Hole GRS 1915+105 by Jeffrey E. McClintock and others (2006, The Astrophysical Journal 652, 518–539)

The primary analysis fits thermal X-ray spectra with a relativistic disk model, using selected disk-dominated data and a luminosity restriction to support the thin-disk assumption. Spectral hardening, inner-edge stress and independently constrained source parameters enter its interpretation. Its black-hole spin inference is conditional on the adopted accretion model and Kerr geometry.