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A very faint core-collapse supernova in M85
A. Pastorello, M. Della Valle, S. J. Smartt +8
An anomalous transient in the early Hubble-type (S0) galaxy Messier 85 (M85) in the Virgo cluster was discovered by Kulkarni et al. (2007) on 7 January 2006 that had very low lumin…
The host galaxy of GRB031203: a new spectroscopic study
R. Margutti, G. Chincarini, S. Covino +11
The host galaxy of the long-duration gamma-ray burst (GRB) 031203 (HG031203) offers a precious opportunity to study in detail the environment of a nearby GRB. The aim is to better…
Upper limit for circumstellar gas around the Type Ia SN 2000cx
F. Patat, S. Benetti, S. Justham +8
The nature of the companion stars in Type Ia Supernova (SNe) progenitor systems remains unclear. One possible way to discriminate between different scenarios is the presence (or ab…
Multicolor observations of the afterglow of the short/hard GRB 050724
D. Malesani, S. Covino, P. D'Avanzo +19
New information on short/hard gamma-ray bursts (GRBs) is being gathered thanks to the discovery of their optical and X-ray afterglows. However, some key aspects are still poorly un…
Swift observations of GRB 060614: an anomalous burst with a well behaved afterglow
V. Mangano, S. T. Holland, D. Malesani +22
GRB 060614 is a remarkable GRB observed by Swift with puzzling properties, which challenge current progenitor models. The lack of any bright SN down to very strict limits and the v…
The bimodality of type Ia Supernovae
F. Mannucci, N. Panagia, M. Della Valle
We comment on the presence of a bimodality in the distribution of delay time between the formation of the progenitors and their explosion as type Ia SNe. Two "flavors" of such bimo…