Статья

MONSTER IN THE DARK: THE ULTRALUMINOUS GRB 080607 AND ITS DUSTY ENVIRONMENT

D. A. PerleyDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]A. N. MorganDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]A. C. UpdikeDepartment of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978, USAF. YuanUniversity of Michigan, Randall Laboratory of Physics, 450 Church Street, Ann Arbor, MI 48109-1040, USAC. AkerlofUniversity of Michigan, Randall Laboratory of Physics, 450 Church Street, Ann Arbor, MI 48109-1040, USAAdam A. MillerDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]J. S. BloomDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]S. B. CenkoDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]W. LiDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]A. V. FilippenkoDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]J. X. ProchaskaDepartment of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USAД. А. КаннThuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyN. R. TanvirDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKA. J. LevanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UKN. ButlerDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]Pierre ChristianDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]D. H. HartmannDepartment of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978, USAPeter MilneSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USAE. S. RykoffPhysics Department, University of California at Santa Barbara, 2233B Broida Hall, Santa Barbara, CA 93106, USAW. RujopakarnSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USAJ. Craig WheelerDepartment of Astronomy, University of Texas, Austin, TX 78712, USAG. G. WilliamsSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA

2010en

ABI

Аннотация

We present early-time optical through infrared photometry of the bright Swift gamma-ray burst (GRB) 080607, starting only 6 s following the initial trigger in the rest frame. Complemented by our previously published spectroscopy, this high-quality photometric data set allows us to solve for the extinction properties of the redshift 3.036 sightline, giving perhaps the most detailed information to date on the ultraviolet continuum absorption properties of any sightline outside our Local Group. The extinction properties are not adequately modeled by anyordinary extinction template (including the average Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud curves), partially because the 2175 Å feature (while present) is weaker by about a factor of two than when seen under similar circumstances locally. However, the spectral energy distribution is exquisitely fitted by the more general Fitzpatrick & Massa parameterization of Local-Group extinction, putting it in the same family as some peculiar Milky Way extinction curves. After correcting for this (considerable, AV = 3.3 ± 0.4 mag) extinction, GRB 080607 is revealed to have been among the most optically luminous events ever observed, comparable to the naked-eye burst GRB 080319B. Its early peak time (t rest < 6 s) indicates a high initial Lorentz factor (F > 600), while the extreme luminosity may be explained in part by a large circumburst density. Only because of its early high luminosity could the afterglow of GRB 080607 be studied in such detail in spite of the large attenuation and great distance, making this burst an excellent prototype for the understanding of other highly obscured extragalactic objects, and of the class of "dark" GRBs in particular.

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Идентификаторы

DOI: 10.1088/0004-6256/141/2/36

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Цитирований: 2Использованных источников: 0

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