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The first X-ray localization of a gamma-ray burst by BeppoSAX and its fast spectral evolution | | L. Piro
; J. Heise
; R. Jager
; E. Costa
; F. Frontera
; M. Feroci
; J. M. Muller
; L. Amati
; M. N. Cinti
; D. Dal Fiume
; L. Nicastro
; M. Orlandini
; G. Pizzichini
; | | Date: |
18 Jul 1997 | | Subject: | astro-ph | | Affiliation: | 2,5), L. Amati (1,6), M. N. Cinti , D. Dal Fiume , L. Nicastro , M. Orlandini and G. Pizzichini ( Istituto Astrofisica Spaziale, C.N.R., Via E. Fermi 21, 00044 Frascati, Italy Space Research Organization in the Netherlands, Sorbonnelaan 2, 3584 CA | | Abstract: | In 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. | | Source: | arXiv, astro-ph/9707215 | | Services: | Forum | Review | PDF | Favorites | |
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