imaged Palomar 15 (Halifax)

The BGO robot captured Palomar 15 by centring on nearby galaxy PGC 59400. A faint globular cluster in the constellation Ophiuchus.

Luminance only, 60 seconds subexposures, 10 stacked shots. FITS Liberator, GIMP. North is up; east is left.

I don't see anything...

Also, there's a big gradient.