Earliest spectroscopy of the GRB030329 optical transient

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dc.creatorSokolov, V. V.
dc.creatorFatkhullin, T. A.
dc.creatorKomarova, V. N.
dc.creatorKurt, V. G.
dc.creatorLebedev, V. S.
dc.creatorCastro-Tirado, A. J.
dc.creatorGuziy, S.
dc.creatorGorosabel, J.
dc.creatorPostigo, A. de Ugarte
dc.creatorCherepaschuk, A. M.
dc.creatorPostnov, K. A.
dc.date2003-12-13
dc.date2004-01-28
dc.date.accessioned2026-07-25T12:10:31Z
dc.descriptionWe present the earliest BTA (SAO RAS 6-m telescope) spectroscopic observations of the GRB030329 optical transient (OT), which almost coincide in time with the first "break" (t ~ 0.5 day after the GRB) of the OT light curve. The BTA/MPFS (Multi Pupil Fiber Spectrograph) spectra are clearly not smooth: the OT spectra showed a continuum with several broad spectral features at about 4000, 4450, 5900AA. The OT spectrum showed some evolution starting from the first night after the burst, and the beginning of spectral changes are seen as early as ~10-12 hours after the GRB. 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. So, summarizing our and other spectroscopic data on the OT we confirm the evolution of the OT spectrum and color pointed also by other authors (Hjorth et al. 2003; Matheson et al. 2003b). The early spectra of GRB030329/SN2003dh properties can be consistent with a shock moving into a stellar wind formed from the pre-SN. Such a behavior (similar to one near the UV shock breakout in SNe) can be explained by the existence of a dense matter in the immediate surroundings of GRB/SN progenitor.
dc.descriptionfixed typos, corrected references, Bulletin of the Special Astrophysical Observatory RAS, 2004, v. 56, p. 5
dc.identifierhttps://arxiv.org/abs/astro-ph/0312359
dc.identifierhttp://arxiv.org/abs/astro-ph/0312359
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/7997
dc.subjectAstrophysics
dc.titleEarliest spectroscopy of the GRB030329 optical transient
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