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Title:
Go Long, Go Deep: Finding Optical Jet Breaks for Swift-Era GRBs with the LBT
Authors:
Dai, X.; Garnavich, P. M.; Prieto, J. L.; Stanek, K. Z.; Kochanek, C. S.; Bechtold, J.; Bouche, N.; Buschkamp, P.; Diolaiti, E.; Fan, X.; Giallongo, E.; Gredel, R.; Hill, J. M.; Jiang, L.; McClelland, C.; Milne, P.; Pedichini, F.; Pogge, R. W.; Ragazzoni, R.; Rhoads, J.; Smareglia, R.; Thompson, D.; Wagner, R. M.
Affiliation:
AA(Department of Astronomy, Ohio State University, Columbus, OH 43210.), AB(University of Notre Dame, 225 Nieuwland Science, Notre Dame, IN 46556-5670.), AC(Department of Astronomy, Ohio State University, Columbus, OH 43210.), AD(Department of Astronomy, Ohio State University, Columbus, OH 43210.), AE(Department of Astronomy, Ohio State University, Columbus, OH 43210.), AF(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AG(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany.), AH(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany.), AI(INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy.), AJ(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AK(INAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio, Italy.), AL(Max Planck Institute for Astronomy, Konigstuhl 17, 69117 Heidelberg, Germany.), AM(Large Binocular Telescope Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065.), AN(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AO(University of Notre Dame, 225 Nieuwland Science, Notre Dame, IN 46556-5670.), AP(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AQ(INAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio, Italy.), AR(Department of Astronomy, Ohio State University, Columbus, OH 43210.), AS(INAF, Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy.), AT(School of Earth and Space Exploration, Arizona State University, Tempe, AZ.), AU(INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34131 Trieste, Italy.), AV(Large Binocular Telescope Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065.), AW(Department of Astronomy, Ohio State University, Columbus, OH 43210.; Large Binocular Telescope Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065.)
Publication:
The Astrophysical Journal, Volume 682, Issue 2, pp. L77-L80. (ApJL Homepage)
Publication Date:
08/2008
Origin:
UCP
ApJ Keywords:
Gamma Rays: Bursts
DOI:
10.1086/591041
Bibliographic Code:
2008ApJ...682L..77D

Abstract

Using the 8.4 m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hr to 30.8 days after the burst triggers to systematically probe the late-time behaviors of afterglows including jet breaks, flares, and supernova bumps. We detected five afterglows with Sloan r' magnitudes ranging from 23.0 to 26.3 mag. The depth of our observations allows us to extend the temporal baseline for measuring jet breaks by another decade in timescale. We detected two jet breaks and a third candidate, all of which are not detectable without deep, late-time optical observations. In the other three cases, we do not detect the jet breaks either because of contamination from the host galaxy light, the presence of a supernova bump, or the intrinsic faintness of the optical afterglow. This suggests that the basic picture that GRBs are collimated is still valid and that the apparent lack of Swift jet breaks is due to poorly sampled afterglow light curves, particularly at late times.

Based on data acquired using the Large Binocular Telescope (LBT). The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are the University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; the Ohio State University; and the Research Corporation, on behalf of the University of Notre Dame, the University of Minnesota, and the University of Virginia.

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