Swift and optical observations of GRB 050401
M. de PasqualeMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTA. P. BeardmoreUniversity of Leicester, University Road, Leicester LE1 7RHPatricia T. BoydNASA/Goddard Space Science Flight Center, Greenbelt, MD 20771, USAD. N. BurrowsDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAR. FinkNASA/Goddard Space Science Flight Center, Greenbelt, MD 20771, USAN. GehrelsNASA/Goddard Space Science Flight Center, Greenbelt, MD 20771, USAS. KobayashiCenter for Gravitational Wave Physics, Pennsylvania State University, University Park, PA 16802, USAK. O. MasonMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTR. McNoughtResearch School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, AustraliaJ. A. NousekDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAK. L. PageUniversity of Leicester, University Road, Leicester LE1 7RHD. M. PalmerLos Alamos National Laboratories, Los Alamos, NM 87545, USAB. A. PetersonResearch School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, AustraliaP. A. PriceInstitute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USAJ. RichResearch School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, AustraliaP. W. A. RomingDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAS. R. RosenMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTT. SakamotoNASA/Goddard Space Science Flight Center, Greenbelt, MD 20771, USAB. SchmidtResearch School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, AustraliaJ. TuellerNASA/Goddard Space Science Flight Center, Greenbelt, MD 20771, USAA. A. WellsUniversity of Leicester, University Road, Leicester LE1 7RHSilvia ZaneMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTBing ZhangDepartment of Physics, University of Nevada, Las Vegas, NV 89154, USAH. ZiaeepourMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT
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We present the results of the analysis of -ray and X-ray data of GRB 050401 taken with the Swift satellite, together with a series of ground-based follow-up optical observations. The Swift X-ray light curve shows a clear break at about 4900 s after the -ray burst (GRB). The decay indices before and after the break are consistent with a scenario of continuous injection of radiation from the 'central engine' of the GRB to the fireball. Alternatively, this behaviour could result if ejecta are released with a range of Lorentz factors, with the slower shells catching up the faster at the afterglow shock position. The two scenarios are observationally indistinguishable.
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