  We present radio, millimeter and optical observations of the afterglow of
GRB030329. UBVR_{C}I_{C} photometry is presented for a period of 3 hours to 34
days after the burst. Radio monitoring at 1280 MHz has been carried out using
the GMRT for more than a year. Simultaneous millimeter observations at 90 GHz
and 230 GHz have been obtained from the Swedish-ESO Submillimeter Telescope
(SEST) and the IRAM-PdB interferometer over more than a month following the
burst. We use these data to constrain the double jet model proposed by Berger
et al. (2003) for this afterglow. We also examine whether instead of the two
jets being simultaneously present, the wider jet could result from the
initially narrow jet, due to a fresh supply of energy from the central engine
after the ``jet break''.
