Cusumano, G.G.CusumanoMangano, V.V.ManganoChincarini, G.G.ChincariniGiommi, PaoloPaoloGiommi2020-09-172020-09-172006-05-01https://hdl.handle.net/20.500.13025/478GAMMA-RAY BURSTS IN THE SWIFT ERA Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 564-569 (2006).Swift discovered the high redshift (z=6.29) GRB 050904 with the Burst Alert Telescope and began observing with its narrow field instruments only 161 s after the burst onset. GRB 050904 was a long, multi-peaked, bright GRB with a presence of flaring activity lasting up to 1-2 hours after the burst onset. The spectral energy distribution shows a clear softening trend along the burst evolution with a photon index decreasing from -1.2 up to -1.9. The observed variability is more dramatic than the typical Swift afterglow, the amplitude and rise/fall times of the flares are consistent with the behavior of nearby (z <= 1) long GRBs and suggest the interpretation of the BAT and XRT data as a single continuous observation of long lasting prompt emission.10.1063/1.2207955http://adsabs.harvard.edu/abs/2006AIPC..836..564C2006AIPC..836..564C