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

  1. D. R. Young50
  1. 1Astrophysics Research Institute, Liverpool John Moores University, Liverpool
  2. 2Dipartimento di Fisica, Universitá di Ferrara, via Saragat 1, I-44100 Ferrara, Italy
  3. 3INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807, Merate, LC, Italy
  4. 4Department of Physics, University of Warwick, Coventry
  5. 5Department of Physics and Astronomy, University of Leicester, Leicester
  6. 6Space Research Institute of RAS, Profsoyuznaya, 84/32, Moscow, Russia
  7. 7NASA/Marshall Space Flight Center, Huntsville, AL, USA
  8. 8NASA Postdoctoral Program Fellow, USA
  9. 9Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge
  10. 10Instituto de Fisica de Cantabria (CSIC-UC), E39005-Santander, Spain
  11. 11Instituto de Astrofísica de Andalucía (IAA-CSIC), Granada, Spain
  12. 12Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  13. 13CEOU, Department of Physics & Astronomy, Seoul National University, Seoul, Korea
  14. 14Astronomical Institute, University of Amsterdam, XH Amsterdam, the Netherlands
  15. 15Indian Institute of Astrophysics, Bangalore, India
  16. 16Observatori Astronómic de la Universitat de València, Valencia, Spain
  17. 17University of Sheffield, Department of Physics & Astronomy, Sheffield
  18. 18Deutsches SOFIA Institut, Universität Stuttgart, Stuttgart, Germany
  19. 19SOFIA Science Center, NASA Ames Research Center, Moffett Field CA, USA
  20. 20AIM, CEA/DSM - CNRS - Université Paris Diderot, Irfu/SAP, Centre de Saclay, France
  21. 21Special Astrophysical Observatory of Russian Academy of Science (SAO-RAS), Nizhnij Arkhyz, Karachai-Cherkessia, Russia
  22. 22Space Telescope Science Institute, Baltimore, MD, USA
  23. 23Physics Department, University of Notre Dame, Notre Dame, IN, USA
  24. 24Faculty of Mathematics and Physics, University of Ljubljana, Slovenia
  25. 25Centre of Excellence SPACE-SI, Aškerčeva cesta 12, SI-1000 Ljubljana Slovenia
  26. 26Department of Physics and Astronomy, University of North Carolina, NC, USA
  27. 27Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan
  28. 28University of Bristol, H. H. Wills Physics Laboratory, Bristol
  29. 29Ulugh Beg Astronomical Institute, Tashkent, Uzbekistan
  30. 30Korea Astronomy and Space Science Institute, Daejeon, Korea
  31. 31University of California, Santa Cruz, CA, USA
  32. 32Institute of Solar-Terrestrial Physics, Irkutsk, Russia
  33. 33Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL, USA
  34. 34Max-Planck-Institut für Astrophysik, Karl-Schwarzschild- Strasse 1, Garching, Germany
  35. 35Scuola Normale Superiore, Piazza Cavalieri 7, Pisa, Italy
  36. 36INAF Oss. Astron. Padova, vicolo dellOsservatorio 5, Padova, Italy
  37. 37Computational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
  38. 38Osservatorio Astronomico Di Trieste, Via G. B. Tiepolo, Trieste, Italy
  39. 39School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
  40. 40SRI Crimean Astrophysical Observatory, Nauchny, Crimea, Ukraine
  41. 41Carnegie Observatories, 813 Santa Barbara Street, Pasadena, California, USA
  42. 42ASTRON, Radio Observatory, Dwingeloo, Netherlands
  43. 43Astronomy Centre, James Cook University, Townsville, Australia
  44. 44Las Cumbres Observatory Global Telescope Network, Goleta, CA, USA
  45. 45Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, London
  46. 46Institute of Astronomy, National Central University, Chung-Li, Taiwan
  47. 47Isaac Newton Group of Telescopes, Apartado de correos 321, E-38700 Santa Cruz de la Palma, Canary Islands, Spain
  48. 48Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
  49. 49Sternberg Astronomical Institute, Moscow State University, Moscow, Russia
  50. 50Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast
  1. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program no. 10909.
  2. ↵†E-mail: zec{at}astro.livjm.ac.uk
  3. ↵‡Hubble Fellow.
  • In original form 2010 October 13.
  • Received 2010 December 7.
  • Accepted 2010 December 7.
  • First published online May 1, 2011.

Abstract

We 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−to > 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.

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  1. MNRAS 413 (1): 669-685. doi: 10.1111/j.1365-2966.2010.18164.x First published online May 1, 2011
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