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We secured high resolution spectra of nova Sgr 2004 during its early decline. The spectra were taken within three months after the discovery of the nova with FEROS at the 2.2m at the ESO-La Silla Observatory. Here, we present preliminary analysis and results. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

We present spectroscopic and photometric observations of the afterglow of GRB 021211 and the discovery of its associated supernova, SN 2002lt. The spectrum shows a broad feature (FWHM = 150 Å), around 3770 Å (in the rest-frame of the GRB) which we interpret as Ca H+K blueshifted by 14 400 km/s. Overall, the spectrum shows a suggestive resemblance with the one of the prototypical type-Ic SN 19941. This might indicate that GRBs are produced also by standard type-Ic supernovæ. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

We present photometric and spectroscopic observations of the late afterglow of GRB 000911. We detect a moderately significant re-brightening in the R, I and J lightcurves, associated with a sizable reddening of the spectrum. This can be explained through the presence of an underlying supernova, outshining the afterglow ∼ 30 days after the burst event. [ABSTRACT FROM AUTHOR]