GRB990123: Multiwavelength afterglow study

Maiorano, E. and Masetti, N. and Palazzi, E. and Frontera, F. and Grandi, P. and Pian, E. and Amati, L. and Nicastro, L. and Soffitta, P. and Corsi, A. and Piro, L. and Antonelli, L. A. and Costa, E. and Feroci, M. and Heise, J. and in 't Zand, J. J. M. (2005) GRB990123: Multiwavelength afterglow study. Il nuovo cimento C, 28 (4\5). pp. 525-528. ISSN 1826-9885

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Were port on the BeppoSAX and multiwavelength data analysis of the afterglow of Gamma-Ray Burst (GRB) 990123. Mainly due to its exceptional brightness, this is the only source for which the Wide Field Cameras have allowed an early detection of the X-ray afterglow between ∼20 and 60 min after the GRB trigger. Besides, again for the first time, high-energy emission from the afterglow was detected up to 60 keV. The backwards extrapolation of the afterglow decay smoothly reconnects with the late GRB emission, thus indicating that both are consistent with being produced by the same phenomenon. For the X-ray afterglow we found a power law decay with index αX = 1.46 ± 0.04; the spectrum has a power law shape with photon index Γ ∼ 2. An extensive set of multiwavelength observations on the afterglow, collected from the literature and made during the BeppoSAX pointing, allowed constructing a Spectral Flux Distribution. We performed an analysis of the GRB afterglow emission in the context of the “fireball” model.

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 ; X-ray ; γ-ray sources; γ-ray bursts
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 16:57
Last Modified: 16 Mar 2020 16:57

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