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281116.0 [No comment] 19.09.2007 11:00 Released

ID: 281116.0, MPI für Kernphysik / High-Energy Astrophysics
The Anomalous Early Afterglow of GRB 050801
Authors:Rykoff, E.S.; Aharonian, F.; Akerlof, C. W.; Mangano, V.; Ashley, M. C. B.; Güver, T.; Horns, Dieter; Krimm, H. A.; Kiziloglü, Ü.; McKay, T. A.; Özel, M.; Phillips, A.; Quimby, R. M.; Schaefer, B. E.; Smith, D. A.; Swan, H. F.; Vestrand, W. T.; Wheeler, J. C.; Wren, J.; Yost, S. A.; Barthelmy, S. D.; Gehrels, N.; Gögüs, E.; Burrows, D.N.; Rowell, Gavin; Rujopakarn, W.; Yuan, F.; Sari, R.
Research Context:gamma rays: bursts
Date of Publication (YYYY-MM-DD):2006-02-10
Title of Journal:The Astrophysical Journal
Issue / Number:1, part 2
Start Page:L5
End Page:L8
Copyright:The American Astronomical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The ROTSE-IIIc telescope at the HESS site, Namibia, obtained the earliest detection of optical emission from a gamma-ray burst (GRB), beginning only 21.8 s from the onset of Swift GRB 050801. The optical light curve does not fade or brighten significantly over the first 250 s, after which there is an achromatic break and the light curve declines in typical power-law fashion. The Swift XRT also obtained early observations starting at 69 s after the burst onset. The X-ray light curve shows the same features as the optical light curve. These correlated variations in the early optical and X-ray emission imply a common origin in space and time. This behavior is difficult to reconcile with the standard models of early afterglow emission.
Free Keywords:gamma rays: bursts
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
External Affiliations:University of Michigan, 2477 Randall Laboratory, 450 Church Street, Ann Arbor, MI 48109
INAF–Istituto di Astrofisica Spaziale e Cosmica, Via Ugo La Malfa 153, I-90146 Palermo, Italy.
California Institute of Technology, Mail Stop 130-33, Pasadena, CA 91125.
School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW 2052, Australia.
NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, MD 20771.
Department of Astronomy and Astrophysics and Department of Physics, Pennsylvania State University, University Park, PA 16802.
Faculty of Engineering and Natural Sciences, Sabanc University, Orhanli-Tuzla, 34956 Istanbul, Turkey.
Istanbul University Science Faculty, Department of Astronomy and Space Sciences, 34119 University-Istanbul, Turkey.
Middle East Technical University, Inonu Bulvari, 06531 Ankara, Turkey.
Universities Space Research Association, 10227 Wincopin Circle, Suite 212, Columbia, MD 21044.
Çanakkale Onsekiz Mart Üniversitesi, Terziolu 17020, Çanakkale, Turkey.
Department of Astronomy, University of Texas, Austin, TX 78712.
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803.
Guilford College, 5800 West Friendly Avenue, Greensboro, NC 27410.
Los Alamos National Laboratory, NIS-2 MS D436, Los Alamos, NM 87545.