We report optical and near-infrared follow-up observations of GRB 011121 collected predominantly at ESO telescopes in Chile. We discover a break in the afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9°. The jet origin of this break is supported by the fact that the spectral energy distribution is

The association of Gamma-Ray Bursts (GRBs) with Supernovae (SNe), or at least of some GRBs with some SN is now confirmed for several events. Of these, the most intense and better followed is the one associated with SN2003dh, namely GRB 030329, detected by HETE-2, a NASA ``explorer'' mission devoted to fast detection and localization of GRBs. Other

Aims.We present multiwavelength observations of the gamma-ray burst GRB 051028 detected by HETE-2 in order to derive its afterglow emission parameters and to determine the reason for its optical faintness when compared to other events. Methods: .Observations were taken in the optical (2.0 m Himalayan Chandra Telescope, 1.34 m Tautenburg, 4.2 m

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IAUC 6792 available at Central Bureau for Astronomical Telegrams.

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