The first X-ray localization of a gamma-ray burst by BeppoSAX and its fast spectral evolution

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dc.creatorPiro, L.
dc.creatorHeise, J.
dc.creatorJager, R.
dc.creatorCosta, E.
dc.creatorFrontera, F.
dc.creatorFeroci, M.
dc.creatorMuller, J. M.
dc.creatorAmati, L.
dc.creatorCinti, M. N.
dc.creatorFiume, D. Dal
dc.creatorNicastro, L.
dc.creatorOrlandini, M.
dc.creatorPizzichini, G.
dc.date1997-07-18
dc.date.accessioned2026-07-07T12:19:45Z
dc.date.available2026-07-07T12:19:45Z
dc.descriptionIn this paper we present the observations performed by the BeppoSAX Gamma-Ray Burst Monitor (GRBM) and Wide Field Cameras (WFC) of GB960720. We derive a precise localization (3 arcmin radius) and fast broad band (2-700 keV) spectral evolution of the event. A search in the catalogues at all wavelengths in the error box yields a unique outstanding source: the bright radio quasar 4C 49.29. Although the probability of finding such a source by chance is very low (0.0002), the absence of similar counterparts in other small error boxes suggests a chance occurrence. We also find that the duration-energy relationship for bursts previously observed above 25keV (Fenimore et al. 1995) extends down to 1.5 keV. This result suggests that the same radiation mechanism is operating from X-rays to gamma-rays and is in agreement with radiative cooling by synchotron emission. A fast evolution of the spectrum is found, in which the ratio of X- to gamma-ray intensities varies over three orders of magnitude. Furthermore, the spectrum in the initial phase of the event betrays the presence of an optically thick source rapidly evolving in a thin configuration.No other class of sources in the universe shows such a fast and extreme evolution. These results pose new and tighter constraints on theoretical models for gamma-ray bursts.
dc.description5 pages, LaTeX, 5 postscript figures; A&A, Accepted 15 July 1997, updated reference Costa 1997b
dc.identifierhttps://arxiv.org/abs/astro-ph/9707215
dc.identifierhttp://arxiv.org/abs/astro-ph/9707215
dc.identifierAstron.Astrophys.329:906-910,1998
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/212866
dc.subjectAstrophysics
dc.titleThe first X-ray localization of a gamma-ray burst by BeppoSAX and its fast spectral evolution
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