Статья

Go Long, Go Deep: Finding Optical Jet Breaks for <i>Swift</i> -Era GRBs with the LBT

Xinyu DaiDepartment of Astronomy, Ohio State University, Columbus, OH 43210P. GarnavichUniversity of Notre Dame, 225 Nieuwland Science, Notre Dame, IN 46556-5670J. L. PrietoDepartment of Astronomy, Ohio State University, Columbus, OH 43210K. Z. StanekDepartment of Astronomy, Ohio State University, Columbus, OH 43210C. S. KochanekDepartment of Astronomy, Ohio State University, Columbus, OH 43210Jill BechtoldSteward Observatory, University of Arizona, Tucson, AZ 85721N. BouchéMax-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, GermanyPeter BuschkampMax-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, GermanyEmiliano DiolaitiINAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, ItalyXiaohui FanSteward Observatory, University of Arizona, Tucson, AZ 85721E. GiallongoINAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio, ItalyR. GredelMax Planck Institute for Astronomy, Konigstuhl 17, 69117 Heidelberg, GermanyJohn M. HillLarge Binocular Telescope Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065Linhua JiangSteward Observatory, University of Arizona, Tucson, AZ 85721Colin McClellandUniversity of Notre Dame, 225 Nieuwland Science, Notre Dame, IN 46556-5670Peter MilneSteward Observatory, University of Arizona, Tucson, AZ 85721Fernando PedichiniINAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio, ItalyRichard W. PoggeDepartment of Astronomy, Ohio State University, Columbus, OH 43210Roberto RagazzoniINAF, Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, ItalyJames E. RhoadsSchool of Earth and Space Exploration, Arizona State University, Tempe, AZR. SmaregliaINAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34131 Trieste, ItalyD. J. ThompsonLarge Binocular Telescope Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065R. M. WagnerDepartment of Astronomy, Ohio State University, Columbus, OH 43210

2008en

ABI

Аннотация

Using the 8.4m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hours 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 23.0-26.3 mag. The depth of our observations allows us to extend the temporal baseline for measuring jet breaks by another decade in time scale. 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.

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Идентификаторы

DOI: 10.1086/591041

Цитирования и источники

Цитирований: 3Использованных источников: 0

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