E.E. Barnard discovered IC 4537 and communicated the discovery directly to Dreyer, so the date and telescope are unknown. The IC RA is just 5 seconds too small.

600/800mm - 24" (7/19/12): at 260x appeared very faint, very small, elongated 2:1 SW-NE, 20"x10", contains a very faint stellar nucleus. This small galaxy is located just west of the halo of M5 (in the same medium power field), 15' WSW of the center of the showpiece globular! A mag 15 star (possibly a cluster member) lies 36" S.

Notes by Steve Gottlieb