Article

A tale of two GRB-SNe at a common redshift of z = 0.54

D. BersierAstrophysics Research Institute, Liverpool John Moores University, LiverpoolC. GuidorziAstrophysics Research Institute, Liverpool John Moores University, LiverpoolS. KobayashiDipartimento di Fisica, Universitá di Ferrara, via Saragat 1, I-44100 Ferrara, ItalyA. MelandriINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807, Merate, LC, ItalyJ. L. BibbyDepartment of Physics, University of Warwick, CoventryN. ClayAstrophysics Research Institute, Liverpool John Moores University, LiverpoolChris MottramINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807, Merate, LC, ItalyC. G. MundellDepartment of Physics and Astronomy, University of Leicester, LeicesterE. SmallSpace Research Institute of RAS, Profsoyuznaya, 84/32, Moscow, RussiaR. J. SmithNASA/Marshall Space Flight Center, Huntsville, AL, USAI. A. SteeleR. MarguttiInstituto de Fisica de Cantabria (CSIC-UC), E39005-Santander, SpainK. M. SvenssonInstituto de Astrofísica de Andalucía (IAA-CSIC), Granada, SpainA. J. LevanDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkA. E. VolvachCEOU, Department of Physics & Astronomy, Seoul National University, Seoul, KoreaK. WiersemaAstronomical Institute, University of Amsterdam, XH Amsterdam, the NetherlandsP. T. O'Brien (7604567)Indian Institute of Astrophysics, Bangalore, IndiaR. L. C. StarlingObservatori Astronómic de la Universitat de València, Valencia, SpainN. R. TanvirIndian Institute of Astrophysics, Bangalore, IndiaA. PozanenkoUniversity of Sheffield, Department of Physics & Astronomy, SheffieldВ. М. ЛозниковDeutsches SOFIA Institut, Universität Stuttgart, Stuttgart, Germanyvan der Horst A. J. (7601729)Astrophysics Research Institute, Liverpool John Moores University, LiverpoolG. G. PooleyAIM, CEA/DSM -CNRS -Université Paris Diderot, Irfu/SAP, Centre de Saclay, FranceA. Fernández-SotoSpecial Astrophysical Observatory of Russian Academy of Science (SAO-RAS), Nizhnij Arkhyz, Karachai-Cherkessia, RussiaA. J. Castro‐TiradoSpace Telescope Science Institute, Baltimore, MD, USAJ. GorosabelPhysics Department, University of Notre Dame, Notre Dame, IN, USAde Ugarte Postigo A. (7601732)Centre of Excellence SPACE-SI, Aškerčeva cesta 12, SI-1000 Ljubljana SloveniaMyungshin ImInstituto de Astrofísica de Andalucía (IAA-CSIC), Granada, SpainY.‐B. JeonSpace Telescope Science Institute, Baltimore, MD, USAW. K. ParkIndian Institute of Astrophysics, Bangalore, IndiaA. KambleE. RolAcademia Sinica Institute of Astronomy and Astrophysics, Taipei, TaiwanR. G. StromUniversity of Bristol, H. H. Wills Physics Laboratory, BristolR. A. M. J. WijersUlugh Beg Astronomical Institute, Tashkent, UzbekistanD. K. SahuCEOU, Department of Physics & Astronomy, Seoul National University, Seoul, KoreaG. C. AnupamaKorea Astronomy and Space Science Institute, Daejeon, KoreaU. K. GurugubelliJ. Alonso-LoriteUniversity of California, Santa Cruz, CA, USAVicente Bodí PerisInstitute of Solar-Terrestrial Physics, Irkutsk, RussiaM. BurgdorfSpace Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL, USAP. A. CurranТ. А. ФатхуллинDepartment of Physics, University of Warwick, CoventryА. С. МосквитинSpace Research Institute of RAS, Profsoyuznaya, 84/32, Moscow, RussiaВ. В. СоколовMax-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, Garching, GermanyA. S. FruchterDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkJ. F. GrahamAstrophysics Research Institute, Liverpool John Moores University, LiverpoolM. NysewanderAstrophysics Research Institute, Liverpool John Moores University, LiverpoolP. GarnavichComputational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, CA, USAA. GombocSpace Telescope Science Institute, Baltimore, MD, USAJ. B. HaislipDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkK. IvarsenCEOU, Department of Physics & Astronomy, Seoul National University, Seoul, KoreaA. LacluyzéObservatori Astronómic de la Universitat de València, Valencia, SpainD. ReichartScuola Normale Superiore, Piazza Cavalieri 7, Pisa, ItalyK. Y. HuangAvon HuxorSchool of Earth and Space Exploration, Arizona State University, Tempe, AZ, USAM. IbrahimovAstronomical Institute, University of Amsterdam, XH Amsterdam, the NetherlandsY. JeonSRI Crimean Astrophysical Observatory, Nauchny, Crimea, UkraineDaniel KasenCarnegie Observatories, 813 Santa Barbara Street, Pasadena, California, USAS. E. WoosleySRI Crimean Astrophysical Observatory, Nauchny, Crimea, UkraineE. KlunkoAstrophysics Research Institute, Liverpool John Moores University, LiverpoolC. KouveliotouAstrophysics Research Institute, Liverpool John Moores University, LiverpoolP. A. MazzaliSpecial Astrophysical Observatory of Russian Academy of Science (SAO-RAS), Nizhnij Arkhyz, Karachai-Cherkessia, RussiaE. PianDepartment of Physics and Astronomy, University of Leicester, LeicesterP. NugentDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkJames E. RhoadsAstronomy Centre, James Cook University, Townsville, AustraliaV. RumyantsevDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkD. N. ShakhovskoyLas Cumbres Observatory Global Telescope Network, Goleta, CA, USAVictoria ScowcroftInstitute of Astronomy, National Central University, Chung-Li, TaiwanY. TsaprasSternberg Astronomical Institute, Moscow State University, Moscow, RussiaY. UrataSRI Crimean Astrophysical Observatory, Nauchny, Crimea, UkraineO. VăduvescuDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkA. VolnovaUniversity of California, Santa Cruz, CA, USAD. R. YoungAstrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast

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Abstract

http://mnras.oxfordjournals.org/content/413/1/669\nWe present ground-based and Hubble Space Telescope optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z= 0.54. For GRB 060729, bumps are seen in the optical light curves (LCs), and the late-time broad-band spectral energy distributions (SEDs) of the OT resemble those of local Type Ic supernovae (SNe). For GRB 090618, the dense sampling of our optical observations has allowed us to detect well-defined bumps in the optical LCs, as well as a change in colour, that are indicative of light coming from a core-collapse SN. The accompanying SNe for both events are individually compared with SN1998bw, a known GRB supernova, and SN1994I, a typical Type Ic supernova without a known GRB counterpart, and in both cases the brightness and temporal evolution more closely resemble SN1998bw. We also exploit our extensive optical and radio data for GRB 090618, as well as the publicly available Swift-XRT data, and discuss the properties of the afterglow at early times. In the context of a simple jet-like model, the afterglow of GRB 090618 is best explained by the presence of a jet-break at t−t[Subscript:o] > 0.5 d. We then compare the rest-frame, peak V-band absolute magnitudes of all of the GRB and X-Ray Flash (XRF)-associated SNe with a large sample of local Type Ibc SNe, concluding that, when host extinction is considered, the peak magnitudes of the GRB/XRF-SNe cannot be distinguished from the peak magnitudes of non-GRB/XRF SNe.

Topics

Gamma-ray bursts and supernovae Astrophysical Phenomena and Observations Pulsars and Gravitational Waves Research

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