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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



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ID: 281206.0, MPI für Kernphysik / High-Energy Astrophysics
Early-Time Observations of the GRB 050319 Optical Transient
Authors:Rykoff, E.S.; Aharonian, F.; Akerlof, C. W.; Alatalo, K.; Ashley, M. C. B.; Güver, T.; Horns, Dieter; Kehoe, R. L.; 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.; Gögüs, E.
Language:English
Research Context:gamma rays: bursts
Date of Publication (YYYY-MM-DD):2006-03-20
Title of Journal:The Astrophysical Journal
Volume:640
Issue / Number:1, part 1
Start Page:402
End Page:406
Copyright:The American Astronomical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present the unfiltered ROTSE-III light curve of the optical transient associated with GRB 050319 beginning 4 s after the cessation of gamma-ray activity. We fit a power-law function to the data using the revised trigger time given by Chincarini and coworkers, and a smoothly broken power-law to the data using the original trigger disseminated through the GCN notices. Including the RAPTOR data from Woniak and coworkers, the best-fit power-law indices are α = -0.854 ± 0.014 for the single power-law and α1 = -0.364-0.019+0.020, α2 = -0.881-0.031+0.030, with a break at tb = 418 -30+31 s for the smoothly broken fit. We discuss the fit results, with emphasis placed on the importance of knowing the true start time of the optical transient for this multipeaked burst. As Swift continues to provide prompt GRB locations, it becomes more important to answer the question, "when does the afterglow begin?" in order to correctly interpret the light curves.
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:Department of Astronomy, University of Texas, Austin, TX 78712
University of Michigan, 2477 Randall Laboratory, 450 Church Street, Ann Arbor, MI 48104;
Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720;
School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW 2052, Australia;
Sabanc University, Orhanl-Tuzla 34956, Istanbul, Turkey;
Istanbul University Science Faculty, Department of Astronomy and Space Sciences, 34119, University of Istanbul, Turkey;
Department of Physics, Southern Methodist University, Dallas, TX 75275;
Middle East Technical University, 06531 Ankara, Turkey;
Çanakkale Onsekiz Mart Üniversitesi, Terziolu 17020, Çanakkale, Turkey;
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;
Identifiers:URL:http://www.journals.uchicago.edu/ApJ/journal/issue...
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