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Astron. Astrophys. Suppl. Ser. 138, 399-400

Spectral evolution of gamma-ray bursts with BeppoSAX and correlation with X-ray afterglow properties

F. Frontera1,2 - L. Amati1 - A. Castro-Tirado8 - E. Costa3 - D. Dal Fiume1 - M. Feroci3 - J. Heise4 - N. Masetti1 - J.M Muller4,5 - L. Nicastro9 - M. Orlandini1 - E. Palazzi1 - E. Pian1 - L. Piro3 - M. Tavani6,7 - J. in't Zand

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1 - Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, Via Gobetti 101, 40129 Bologna, Italy
2 - Dipartimento di Fisica, Università di Ferrara, Via Paradiso 11, 44100 Ferrara, Italy
3 - Istituto Astrofisica Spaziale, CNR, Via Fosso del Cavaliere, 00133 Roma, Italy
4 - Space research Organization in the Netherlands, Utrecht, NL, The Netherlands
5 - BeppoSAX Scientific Data Center, Via Corcolle, 00100 Roma, Italy
6 - Istituto di Fisica Cosmica e Teconologie Relative, CNR, Via Bassini 15/A, 20133 Milano, Italy
7 - Columbia Astrophysics Laboratory, New York, U.S.A.
8 - LAEFF, Madrid, Spain
9 - Istituto Fisica Cosmica e Informatica, CNR, Palermo, Italy

Received January 21; accepted April 21, 1999


We report some comparative results of an investigation devoted to study the spectral evolution of a sample of Gamma-Ray Bursts. They were simultaneously detected with both the Gamma-Ray Burst Monitor and the Wide Field Cameras aboard the BeppoSAX satellite and were reobserved with the Narrow Field Instruments aboard the same satellite.

Key words: gamma-rays: bursts -- X-rays: general

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