Lewis Swift discovered NGC 6136 = Sw. IV-33 on 6 Jul 1886 and recorded "eeeF; S; R; nearly between 5 pB stars in a curve north and 3 F stars in a curve south; ee diff.". His position and description matches CGCG 276-010 = PGC 57892.

400/500mm - 17.5" (6/15/91): extremely faint, very small, round, very low even surface brightness. A nice row of stars is just north consisting of four mag 11-12 stars oriented WNW-ESE ending at mag 8.5 SAO 29903 at the WNW end. NGC 6136 is located 5.5' SW of SAO 29903.

Notes by Steve Gottlieb