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An Off-Axis Model for GRB 031203
Enrico Ramirez-Ruiz, Jonathan Granot, Chryssa Kouveliotou +3
The low luminosity radio emission of the unusually faint GRB 031203 has been argued to support the idea of a class of intrinsically sub-energetic gamma-ray bursts (GRBs), currently…
High velocity features in the spectra of the Type Ia SN 1999ee: a property of the explosion or evidence of circumstellar interaction?
P. A. Mazzali, S. Benetti, M. Stehle +5
The near-maximum spectra of the Type Ia SN 1999ee are reviewed. Two narrow absorption features corresponding to the strongest component of the CaII IR triplet appear in the spectra…
Properties of Two Hypernovae Entering the Nebular Phase: SN 1997ef and SN 1997dq
P. A. Mazzali, J. Deng, K. Maeda +3
The two peculiar Type Ic supernovae (SNe) 1997ef and 1997dq are shown to have very similar photometric and spectral evolution in the epochs when both SNe are observed (i.e. beyond…
Abundance stratification in Type Ia supernovae - I. The case of SN 2002bo
M. Stehle, P. A. Mazzali, S. Benetti +1
The abundance stratification in the ejecta of the normal Type Ia supernova 2002bo is derived by fitting a series of spectra obtained at close time intervals. A Monte Carlo code, mo…
Photometric Observations of the Type Ia SN 2002er in UGC 10743
G. Pignata, F. Patat, S. Benetti +20
Extensive light and colour curves for the Type Ia supernova SN 2002er are presented as part of the European Supernova Collaboration. We have collected UBVRI photometry from ten dif…
SN 2003lw and GRB 031203: A Bright Supernova for a Faint Gamma-ray Burst
D. Malesani, G. Tagliaferri, G. Chincarini +23
Optical and near-infrared observations of the gamma-ray burst GRB 031203, at z = 0.1055, are reported. A very faint afterglow is detected superimposed to the host galaxy in our fir…
Supernova light curve models for the bump in the Optical Counterpart of X-Ray Flash 030723
N. Tominaga, J. Deng, P. A. Mazzali +5
XRF 030723 is the first X-ray flash (XRF) to show in its optical light curve (LC) a bump that has been interpreted as the signature of a supernova (SN). After subtracting the after…
The J-band Light Curve of SN 2003lw, Associated with GRB 031203
A. Gal-Yam, D. -S. Moon, D. B. Fox +15
At z=0.1055, the gamma-ray burst GRB 031203 is one of the two nearest GRBs known. Using observations from the Very Large Array (VLA) and Chandra X-ray Observatory, we derive sub-ar…
The Rates of Hypernovae and Gamma-Ray Bursts: Implications for their Progenitors
Ph. Podsiadlowski, P. A. Mazzali, K. Nomoto +2
A critical comparison of estimates for the rates of hypernovae (HNe) and gamma-ray bursts (GRBs) is presented. Within the substantial uncertainties, the estimates are shown to be q…
On the jet structure and magnetic field configuration of GRB 020813
D. Lazzati, S. Covino, J. Gorosabel +32
The polarization curve of GRB 020813 is discussed and compared to different models for the structure, evolution and magnetisation properties of the jet and the interstellar medium…