The optical SN 2012bz associated with the long GRB 120422A

Aims. The association of Type Ic supernovae (SNe) with long-duration gamma-ray bursts (GRBs) is well established. We endeavor, through accurate ground-based observational campaigns, to characterize these SNe at increasingly high redshifts. Methods. We obtained a series of optical photometric and spe...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2012-11, Vol.547, p.A82
Hauptverfasser: Melandri, A., Pian, E., Ferrero, P., D’Elia, V., Walker, E. S., Ghirlanda, G., Covino, S., Amati, L., D’Avanzo, P., Mazzali, P. A., Della Valle, M., Guidorzi, C., Antonelli, L. A., Bernardini, M. G., Bersier, D., Bufano, F., Campana, S., Castro-Tirado, A. J., Chincarini, G., Deng, J., Filippenko, A. V., Fugazza, D., Ghisellini, G., Kouveliotou, C., Maeda, K., Marconi, G., Masetti, N., Nomoto, K., Palazzi, E., Patat, F., Piranomonte, S., Salvaterra, R., Saviane, I., Starling, R. L. C., Tagliaferri, G., Tanaka, M., Vergani, S. D.
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Zusammenfassung:Aims. The association of Type Ic supernovae (SNe) with long-duration gamma-ray bursts (GRBs) is well established. We endeavor, through accurate ground-based observational campaigns, to characterize these SNe at increasingly high redshifts. Methods. We obtained a series of optical photometric and spectroscopic observations of the Type Ic SN 2012bz associated with the Swift long-duration GRB 120422A (redshift z = 0.283) using the 3.6-m TNG and the 8.2-m VLT telescopes during the time interval between 4 and 36 days after the burst. Results. The peak times of the light curves of SN 2012bz in various optical filters differ, with the B-band and i’-band light curves reaching maximum at 9 ± 4 and 23 ± 3 rest-frame days, respectively. The bolometric light curve has been derived from individual bands photometric measurements, but no correction for the unknown contribution in the near-infrared (probably around 10–15%) has been applied. Therefore, the present light curve should be considered as a lower limit to the actual UV-optical-IR bolometric light curve. This pseudo-bolometric curve reaches its maximum (Mbol =  −18.56 ± 0.06) at 13 ± 1 rest-frame days; it is similar in shape and luminosity to the bolometric light curves of the SNe associated with z 
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/201219879