Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...9e..37s&link_type=abstract
Supernovae: One Millennium After SN1006, 26th meeting of the IAU, Joint Discussion 9, 17-18 August 2006, Prague, Czech Republic,
Other
Scientific paper
Long gamma-ray bursts (GRBs) appear to occur during core-collapse of massive stars, i.e. during their supernova (SN) explosion (e.g. Stanek et al. 2003). We bring the results of our analysis of the observed color indices and absolute magnitudes of the SNe associated with GRBs and X-ray flashes (XRFs), especially with GRB980425, GRB011121, GRB030329, XRF020903, XRF030723, GRB060218. We show that the method of the color indices gives us a possibility to separate the contributions of the synchrotron radiation from that of the SN in the optical afterglow (OA), using the commonly available multiband photometry. We demonstrate that the color indices of the SNe (and their time evolution) are different from those of the synchrotron emission of the OA. This approach is important mainly for analyses of abundant faint OAs of GRBs for which obtaining spectra with good signal to noise at late phases is often impossible. Analysis of the color indices and a search for an associated SN are possible even for archival data of OAs. The color indices are thus a better tool to resolve the evolution of the SN in the profile of an OA than the light curves themselves. We show that not only the colors at a given phase of the evolution of the SN, but also the color evolution are useful for the classification and study of such objects. We are able to put constraints on the types of SNe associated with GRBs and XRFs using the color indices. We can also determine the time intervals in which good match of a given SN is close to the canonical SN1998bw. We show that the color evolution of the SNe with differently fast time evolution, associated with GRBs and XRFs, often closely follows that of SN1998bw if a stretching of its time evolution is applied. We show indications that the SNe associated with GRBs often possess initially more negative color indices than other SNe of Type Ib/Ic. Our approach brings new progress in the investigation of the GRB-SN relation.
Hudec Rene
Pizzichini Graziella
Simon Veronica
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