The earliest spectroscopy of the GRB 030329 afterglow with SAO RAS 6-m telescope and early spectra of core-collapse supernova

Kurt, V. G. and Sokolov, V. V. and Fatkhullin, T. A. and Komarova, V. N. and Lebedev, V. S. and Sokolova, T. N. and Castro-Tirado, A. J. and De Ugarte Postigo, A. and Gorosabel, J. and Guziy, S. (2005) The earliest spectroscopy of the GRB 030329 afterglow with SAO RAS 6-m telescope and early spectra of core-collapse supernova. Il nuovo cimento C, 28 (4\5). pp. 521-524. ISSN 1826-9885

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The earliest BTA (SAO RAS 6-m telescope) spectroscopic observations of the GRB 030329 optical transient (OT) are presented, which almost coincide in time with the “first break” (t ∼ 0.5 day after the GRB) of the OT light curve. The beginning of spectral changes are seen as early as ∼ 10–12 hours after the GRB. So, the onset of the spectral changes for t < 1 day indicates that the contribution from Type Ic supernova (SN) into the OT optical flux can be detected earlier. The properties of early spectra of GRB 030329/SN 2003dh can be consistent with a shock moving into a stellar wind formed from the pre-SN. Such a behavior (similar to that near the UV shock breakout in SNe) can be explained by the existence of a dense matter in the immediate surroundings of massive stellar GRB/SN progenitor (see Young et al., ApJ, 449 (1995) L51 and Imshennik and Nadyozhin, Usp. Fiz. Nauk, 5 (1988) 561). The urgency is emphasized of observation of early GRB/SN spectra for solving a question that is essential for understanding GRB physical mechanism: Do all long-duration gamma-ray bursts are caused by (or physically connected to) ordinary core-collapse supernovae? If clear association of normal/ordinary core-collapse SNe (SN Ib/c, and others SN types) and GRBs would be revealed in numbers of cases, we may have strong observational limits for gamma-ray beaming and for real energetics of the GRB sources.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: Spectroscopy and spectrophotometry ; γ-ray sources; γ-ray bursts ; Supernovae
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 16:56
Last Modified: 16 Mar 2020 16:56

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