Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218 ?

GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy Eiso emitted in the prompt radiation phase and the peak frequency Epeak of the spectrum in a νFν representation (the so–called Amati relation). We discuss if these two bursts are really different from the others or if their location in the Eiso–Epeak plane is the result ...

Could the GRB - Supernovae GRB 031203 and XRF 060218 be Cosmic Twins ?

The gamma-ray burst (GRB) / X-ray flash (XRF) events GRB031203, discovered by INTEGRAL, and XRF 060218, discovered by Swift, represent two of only five GRB-SNe with optical spectroscopic confirmation of their SN components. Yet their observed high-energy properties offer a sharp contrast: While GRB031203 was detected as a short 40-s burst with a spectrum peaking at Epeak > 190 keV, XRF060218 wa...

Puzzled by GRB 060218

We study the optical–UV/X–ray spectral energy distribution of GRB 060218 during the prompt phase and during what seems to be the afterglow phase. The results are puzzling, since if the opt–UV and the X–ray emission belong to a single black–body, then its luminosity is too large, and this black–body cannot be interpreted as the signature of the shock breakout of the supernova. There are also ser...

Messages from GRB 060218.

GRB 060218 is a watershed event. Statistically, its detection suggests that there is likely a distinct low-luminosity (LL) population of gamma-ray bursts (GRBs) whose event rate is much higher than that of conventional high-luminosity GRBs. This LL population may give significant contribution to the diffuse neutrino background flux at energies higher than 1016eV. The spectral lag of this burst ...

GRB 060218 and the outliers with respect to the