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

ID: 276592.0, MPI für Kernphysik / High-Energy Astrophysics
A Search for Untriggered GRB Afterglows with ROTSE-III
Authors:Rykoff, E.S.; Aharonian, F.; Akerlof, C. W.; Alatalo, K.; Ashley, M. C. B.; Güver, T.; Horns, Dieter; Kehoe, R. L.; Kizilo, 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.
Research Context:galaxies: activegamma rays: burstsnovae, cataclysmic variables
Date of Publication (YYYY-MM-DD):2005-10-01
Title of Journal:The Astrophysical Journal
Issue / Number:2, part 1
Start Page:1032
End Page:1038
Copyright:The American Astronomical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present the results of a search for untriggered gamma-ray burst (GRB) afterglows with the Robotic Optical Transient Search Experiment-III (ROTSE-III) telescope array. This search covers observations from 2003 September to 2005 March. We have an effective coverage of 1.74 deg2 yr for rapidly fading transients that remain brighter than 17.5 mag for more than 30 minutes. This search is the first large-area survey to be able to detect typical untriggered GRB afterglows. Our background rate is very low and purely astrophysical. We have found four previously unknown cataclysmic variables (CVs) and one new flare star. We have not detected any candidate afterglow events or other unidentified transients. We can place an upper limit on the rate of fading optical transients with quiescent counterparts dimmer than 20th magnitude at a rate of less than 1.9 deg-2-2 yr-1 with 95% confidence. This places limits on the optical characteristics of off-axis (orphan) GRB afterglows. As a by-product of this search, we have an effective 52 deg2 yr of coverage for very slowly decaying transients, such as CVs. This implies an overall rate of outbursts from high Galactic latitude CVs of 0.1 deg-2 yr-1.
Free Keywords:galaxies: activegamma rays: burstsnovae, cataclysmic variables
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Physics Department, University of Michigan, 2477 Randall Laboratory, 450 Church Street, Ann Arbor, MI 48109-1040
School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW 2052, Australia
Istanbul University Science Faculty, Department of Astronomy and Space Sciences, 34119, University-Istanbul, Turkey
Department of Physics, Southern Methodist University, Dallas, TX 75275
Department of Physics, Middle East Technical University, Ankara 06531, Turkey
Department of Physics, 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
Los Alamos National Laboratory, NIS-2, MS-D436, Los Alamos, NM 87545
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