Evidence for supernova signatures in the spectrum of the late-time bump of the optical afterglow of GRB 021211

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[1] Valle, M. Della
[2] Malesani, D.
[3] Benetti, S.
[4] Testa, V.
[5] 1,Hamuy, M.
[6] Antonelli, L.A.
[7] 6,Chincarini, G.
[8] 4,Cocozza, G.
[9] Covino, S.
[10] Avanzo, P.D.
[11] Fugazza, D.
[12] Ghisillini, G.
[13] Gilmozzi, R.
[14] Lazzati, D.
[15] Mason, E.
[16] Mazzali, P.
[17] Stella, L.
来源：
Valle, M.D. (massimo@arcetri.astro.it) | 1600年 / EDP Sciences卷 / 406期
关键词：
Gamma rays - Light absorption - Optical properties - Photometry - Spectroscopic analysis - Spectrum analysis;
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摘要：
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occurring ∼25 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 ∼ 10 days past maximum light. Particularly we have measured a strong, broad absorption feature at 3770 Å, which we have identified with CaII blueshifted by ∼14400 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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