FLAMINGOS-2 spectrum

The K-band spectrum of MAXI J1535-571 shows Brackett-gamma in emission, centered at 21667 Angstroms with a FWHM of 79.0 Angstroms or 1090 +/- 60 km/s, well above the intrinsic instrumental resolution of 8.3 Angstroms as measured from sky emission lines. The emission line profile shows no evidence of being double-peaked.