ar X iv : a st ro - p h / 07 03 52 0 v 1 2 0 M ar 2 00 7 Limits on iron - dominated fallback disk in SN 1987 A

ar X iv : a st ro - p h / 03 02 17 7 v 1 1 0 Fe b 20 03 Polarization in GRB Afterglows

ar X iv : a st ro - p h / 06 11 03 3 v 1 1 N ov 2 00 6 On the Progenitor of Supernova 1987 A

A previously unpublished ultralow–dispersion spectrum of Sanduleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed. Subject headings: Supernovae: individual (SN 1987A) — techniques: ultralow– dispersion spectra — Large Magellanic Cloud — supergiants — stars: Sanduleak -69 202

ar X iv : a st ro - p h / 06 11 54 4 v 1 1 6 N ov 2 00 6 Discovery of a nearby twin of SN 1987 A ’ s nebula around the

ar X iv : a st ro - p h / 01 03 44 4 v 1 2 7 M ar 2 00 1 From Centimeter to Millimeter Wavelengths : A High Angular Resolution Study of 3 C 273

We monitored 3C 273 with VLBI at 15–86 GHz since 1990. We discuss component trajectories, opacity effects, a rotating jet, and outburst-ejection relations from Gamma-ray to radio bands.

ar X iv : a st ro - p h / 04 05 56 0 v 1 2 7 M ay 2 00 4 ESC Observations of SN 2002 er around Maximum Light

We present preliminary results of the observational campaign on SN 2002er carried out by the European Supernova Collaboration (ESC). For this supernova the optical coverage from epochs −11 days to +50 days is excellent, both in imaging and spectroscopy. The extinction deduced from the photometry is E(B − V) = 0.35, while ∆m15 = 1.31. In general SN 2002er behaves like a " normal " type Ia supern...