This paper presents the first photoelectric light curves (uvby) of the
bright southern detached double lined eclipsing binary GG Lupi (HR568
7, B7 V + B9 V, p = 1.85d) consisting of two main sequence stars (4.1
M. and 2.5 M.) close to the ZAMS. The orbit of GG Lup is eccentric (e
= 0.150) and shows apsidal motion (U = 101 yr). The light curves, whic
h contain 1035 observations in each colour, were collected during Marc
h 1985. Observations from 1987-91 for 10 additional times of minima ar
e also given. Accurate masses and radii (almost-equal-to 1%) of the co
mponents have been established from an analysis of the light curves an
d of new radial velocity curves. A detailed study of GG Lup is publish
ed separately (Andersen et al. 1993).