First hours of the GRB 030329 optical afterglow

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dc.creatorBurenin, R. A.
dc.creatorSunyaev, R. A.
dc.creatorPavlinsky, M. N.
dc.creatorDenissenko, D. V.
dc.creatorTerekhov, O. V.
dc.creatorTkachenko, A. Yu.
dc.creatorAslan, Z.
dc.creatorKhamitov, I.
dc.creatorUluc, K.
dc.creatorAlpar, M. A.
dc.creatorKiziloglu, U.
dc.creatorBaykal, A.
dc.creatorBikmaev, I.
dc.creatorSakhibullin, N.
dc.creatorSuleymanov, V.
dc.date2003-06-06
dc.date2003-08-01
dc.date.accessioned2026-07-07T11:08:14Z
dc.date.available2026-07-07T11:08:14Z
dc.descriptionWe present the first results of the observations of the extremely bright optical afterglow of gamma-ray burst (GRB) 030329 with the 1.5m Russian-Turkish telescope RTT150 (TUBITAK National Observatory, Bakyrlytepe, Turkey). RTT150 was one of the first 1.5m-class telescopes pointed to the afterglow. Observations were started approximately 6 hours after the burst. During the first 5 hours of our observations the afterglow faded exactly as a power law with index -1.19+-0.01 in each of the BVRI Bessel filters. After that, in all BVRI filters simultaneously we observe a steepening of the power law light curve. The power law decay index smoothly approaches the value ~= -1.9, observed by other observatories later. This power law break occurs at t-t_0 =0.57 days and lasts for +-0.1 days. We observe no variability above the gradual fading with the upper limits 10--1% on time scales 0.1--1000s. Spectral flux distribution in four BVRI filters corresponds to the power law spectrum with spectral index α=0.66+-0.01. The change of the power law decay index in the end of our observations can be interpreted as a signature of collimated ultrarelativistic jet. The afterglow flux distribution in radio, optical and x-rays is consistent with synchrotron spectrum. We continue our observations of this unique object with RTT150.
dc.descriptionAstronomy Letters, Vol. 29, No. 9, p. 573; 6 pages, 5 figures; pagination corrected; the original Russian version can be found at http://hea.iki.rssi.ru/~br/030329/pfh030329.pdf
dc.identifierhttps://arxiv.org/abs/astro-ph/0306137
dc.identifierhttp://arxiv.org/abs/astro-ph/0306137
dc.identifierAstron.Lett.29:573-578,2003
dc.identifierdoi:10.1134/1.1607494
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190068
dc.subjectAstrophysics
dc.titleFirst hours of the GRB 030329 optical afterglow
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