This is evidence that the object is extended and hence contains a significant contribution from the GRB 990712 host galaxy. Zoom-in on a smoothed version of the PSF subtracted image. The updated R-band light curve of the optical afterglow of GRB 990712. The three first points are from SAAO, the fourth point is based on our NTT image. The fifth point is based on our VLT image.
Error bars are about the size of the data points.
The solid curve is the combined effect of these contributions and gives a good fit to the observations. This model also gives a good fit to the observations.