GRB 080319B:A Naked-Eye Stellar Blast from the Distant Universe
On behalf of a large intemational collaboration1,we present the unprecedented broadband observations of GRB080319B,whose prompt optical emission peaked at a visual magnitude of 5.3,making it briefly visible with the naked eye．GRB 080319B was discovered by Swift and captured in exquisite detail by ground based wide-field telescopes,imaging theburst location from before the time of the explosion．The combination of these unique optical data with simultaneous γ-rayobservations provides powerful diagnostics of the detailed physics of this explosion within seconds of its formation．We showthat the prompt optical and γ-ray emissions from this event arise from different spectral components within the same physicalregion located at a large distance from the source,implying an extremely relativistic outflow．Our observations also providegood evidence for a bright reverse shock component．The chromatic behavior of the broadband afterglow is consistent withviewing the GRB down the very narrow inner core of a two-component jet that is expanding into a wind-like environmentconsistent with the massive star origin of longGRBs．
γ-ray bursts
J.L.Racusin D.N.Burrows
Department of Astronomy & Astrophysics,525 Davey Lab,Pennsylvania State University,University Park PA 16802.USA
国际会议
2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)
南京
英文
245-250
2008-06-23（万方平台首次上网日期，不代表论文的发表时间）