GRB follow-up team

Report at the SAO's astrophysical seminar on April, 13, 2006

T.A.Fatkhullin and V.V.Sokolov

Gamma-ray bursts and supernovae: new facts, new models

A review of new observational data confirming a direct relation between cosmic gamma-ray bursts and massive supernovae.

About the gamma-ray burst GRB 060218/SN 2006aj (z=0.033): the most recent observational results and about inevitable changes in "standard"/popular scenarios describing the phenomenon of the gamma-ray burst and explosion of a (massive) supernova.

The observational results were obtained under a joint porgram of Instituto de Astrofisica de Andalucia (Alberto J. Castro-Tirado, IAA-CSIC, Spain) and SAO RAS

The very first spectra of OT GRB 060218

(z = 0.0331)

T(first_Sp) - time after the GRB 060218

0603495* - Sollerman et al., directly in Abstract: "Our first spectra are earlier than spectra for any other GRB-SN."

But Jesper Sollerman is mistaken a lot because

The BTA spectra of GRB 060218/SN 2006aj, as well as the BTA spectra of GRB 030329/SN 2003dh (z = 0.1685), turn out again to be among the very first spectra of two nearest GRB/SN-bursts. UV-excesses in early spectra mean an interaction between the shock wave and the stellar wind of a massive star (the SN Ic shock break-out)

The BTA first spectra of OT GRB 060218

BTA & Zeiss GRB 030329

A model of an asymmetric explosion of the GRB/SN progenitor

…a strongly non-spherical explosion may be a generic feature of core-collapse supernovae of all types.

…Though while it is not clear that the same mechanism that generates the GRB is also responsible for exploding the star.

astro-ph/0603297, Leonard, Filippenko et al.

Fig. from Astro-ph/0604131, Woosley and Heger

Though the phenomenon itself is unusual, but the object-source is not unique!

The closer a GRB-source is, the more are the signs of a supernova.