Journal
ASTRONOMY & ASTROPHYSICS
Volume 406, Issue 2, Pages L33-L37Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20030855
Keywords
gamma rays : bursts; supernovae
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We present photometric and spectroscopic observations of the gamma-ray burst GRB021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occurring similar to25 days after the GRB. The analysis of a VLT spectrum obtained during the bump (27 days after the GRB) reveals a suggestive resemblance with the spectrum of the prototypical type-Ic SN 1994I, obtained similar to10 days past maximum light. Particularly we have measured a strong, broad absorption feature at 3770 Angstrom, which we have identified with Ca II blueshifted by similar to14 400 km s(-1), thus indicating that a supernova (SN) component is indeed powering the bump in the afterglow decay. Assuming SN 1994I as a template, the spectroscopic and photometric data together indicate that the SN and GRB explosions were at most separated by a few days. Our results suggest that GRBs might be associated also to standard type-Ic supernovae.
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