We reported on the deep optical observations of the GRB 990510 OT. We are able to follow the OT in the R band down to 23.7 and derive an upper limit in the I band (). We propose a functional form for the fitting of the multi-band optical light curve (see also S99; Bloom et al. 1999) and derive strong upper limits on the magnitude of galaxy hosting the GRB. In particular, our photometric data exclude an elliptical host galaxy brighter than R=26.6. Further observations are needed in order to look for a faint R27 galaxy host.
© European Southern Observatory (ESO) 1999
Online publication: July 16, 1999