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arxiv: astro-ph/0312264 · v1 · submitted 2003-12-10 · 🌌 astro-ph

SN 2002lt and GRB 021211: a SN/GRB Connection at z = 1

M. Della Valle , D. Malesani , S. Benetti , V. Testa , M. Hamuy , L.A. Antonelli , G. Chincarini , G. Cocozza
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S. Covino P. D'Avanzo D. Fugazza G. Ghisellini R. Gilmozzi D. Lazzati E. Mason P. Mazzali L.Stella
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keywords spectrumtype-icabsorptionafterglowanalyzedaroundassociatedbeen
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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 A), around 3770 A (in the rest-frame of the GRB), which we interpret as Ca H+K blueshifted by 14400 km/s. Potential sources of contamination due to the host galaxy and/or residuals of telluric absorption have been analyzed and ruled out. Overall, the spectrum shows a suggestive resemblance with the one of the prototypical type-Ic SN 1994I. This might indicate that GRBs are produced also by standard type-Ic supernovae.

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