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Title:
Exploring Broadband GRB Behavior during γ-Ray Emission
Authors:
Yost, S. A.; Swan, H. F.; Rykoff, E. S.; Aharonian, F.; Akerlof, C. W.; Alday, A.; Ashley, M. C. B.; Barthelmy, S.; Burrows, D.; Depoy, D. L.; Dufour, R. J.; Eastman, J. D.; Forgey, R. D.; Gehrels, N.; Göğüş, E.; Güver, T.; Halpern, J. P.; Hardin, L. C.; Horns, D.; Kiziloglu, Ü.; Krimm, H. A.; Lepine, S.; Liang, E. P.; Marshall, J. L.; McKay, T. A.; Mineo, T.; Mirabal, N.; Özel, M.; Phillips, A.; Prieto, J. L.; Quimby, R. M.; Romano, P.; Rowell, G.; Rujopakarn, W.; Schaefer, B. E.; Silverman, J. M.; Siverd, R.; Skinner, M.; Smith, D. A.; Smith, I. A.; Tonnesen, S.; Troja, E.; Vestrand, W. T.; Wheeler, J. C.; Wren, J.; Yuan, F.; Zhang, B.
Affiliation:
AA(University of Michigan, Ann Arbor, MI ), AB(University of Michigan, Ann Arbor, MI ), AC(University of Michigan, Ann Arbor, MI ), AD(Max-Planck-Institut für Kernphysik, Heidelberg, Germany ), AE(University of Michigan, Ann Arbor, MI ), AF(Boeing LTS, AMOS Observatory, Kihei, Maui, Hawaii ), AG(School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW, Australia ), AH(NASA Goddard Space Flight Center, Greenbelt, MD ), AI(Department of Astronomy, Penn State, University Park, PA ), AJ(Department of Astronomy, Ohio State University, Columbus, OH ), AK(Rice University, Department of Physics and Astronomy, Houston, TX ), AL(Department of Astronomy, Ohio State University, Columbus, OH ), AM(Hardin Optical Company, Bandon, OR ), AN(NASA Goddard Space Flight Center, Greenbelt, MD ), AO(Sabancı University, Istanbul, Turkey ), AP(Department of Astronomy and Space Sciences, Istanbul University, Istanbul, Turkey ), AQ(Columbia University, Columbia Astrophysics Lab, New York ), AR(Hardin Optical Company, Bandon, OR ), AS(Max-Planck-Institut für Kernphysik, Heidelberg, Germany ), AT(Middle East Technical University, Ankara, Turkey ), AU(NASA Goddard Space Flight Center, Greenbelt, MD; Universities Space Research Association, Columbia, MD ), AV(Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, New York, NY ), AW(Rice University, Department of Physics and Astronomy, Houston, TX ), AX(Department of Astronomy, Ohio State University, Columbus, OH ), AY(University of Michigan, Ann Arbor, MI ), AZ(INAF, Palermo, Italy ), BA(Columbia University, Columbia Astrophysics Lab, New York ), BB(Çanakkale Onsekiz Mart Üniversitesi, Çanakkale, Turkey ), BC(School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW, Australia ), BD(Department of Astronomy, Ohio State University, Columbus, OH ), BE(Department of Astronomy, University of Texas, Austin, TX ), BF(Osservatorio Astronomico di Brera, Merate LC, Italy ), BG(Max-Planck-Institut für Kernphysik, Heidelberg, Germany ), BH(University of Michigan, Ann Arbor, MI ), BI(Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA ), BJ(Astronomy Department, University of California, Berkeley, CA ), BK(Department of Astronomy, Ohio State University, Columbus, OH ), BL(NASA Goddard Space Flight Center, Greenbelt, MD), BM(University of Michigan, Ann Arbor, MI; Guilford College, Greensboro, NC ), BN(Rice University, Department of Physics and Astronomy, Houston, TX ), BO(Columbia University, Columbia Astrophysics Lab, New York ), BP(INAF, Palermo, Italy ), BQ(Astronomy Department, University of California, Berkeley, CA ), BR(Department of Astronomy, University of Texas, Austin, TX ), BS(Los Alamos National Laboratory, Los Alamos, NM ), BT(University of Michigan, Ann Arbor, MI ), BU(Physics Department, University of Nevada, Las Vegas, NV )
Publication:
The Astrophysical Journal, Volume 657, Issue 2, pp. 925-941. (ApJ Homepage)
Publication Date:
03/2007
Origin:
UCP
Astronomy Keywords:
Gamma Rays: Bursts
DOI:
10.1086/510896
Bibliographic Code:
2007ApJ...657..925Y

Abstract

The robotic ROTSE-III telescope network detected prompt optical emission contemporaneous with the γ-ray emission of Swift events GRB 051109A and GRB 051111. Both data sets have continuous coverage at high signal-to-noise levels from the prompt phase onward, and thus the early observations are readily compared to the Swift XRT and BAT high-energy detections. In both cases, the optical afterglow is established, declining steadily during the prompt emission. For GRB 051111, there is evidence of an excess optical component during the prompt emission. The component is consistent with the flux spectrally extrapolated from the γ-rays, using the γ-ray spectral index. A compilation of spectral information from previous prompt detections shows that such a component is unusual. The existence of two prompt optical components-one connected to the high-energy emission, the other to separate afterglow flux, as indicated in GRB 051111-is not compatible with a simple ``external-external'' shock model for the GRB and its afterglow.
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