A trio of gamma-ray burst supernovae:
Z. CanoCentre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavik, IcelandA. de Ugarte PostigoDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkA. PozanenkoSpace Research Institute, 117997, 84/32 Profsoyuznaya str., Moscow, RussiaN. ButlerSchool of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USAC. C. ThöneInstituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008, Granada, SpainC. GuidorziUniversity of Ferrara, Ferrara, ItalyT. KrühlerEuropean Southern Observatory, Garching bei München, GermanyT. KrühlerDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen Ø, 2100, DenmarkJ. GorosabelConsejo Superior de Investigaciones Científicas, Madrid, SpainJ. GorosabelIkerbasque, Basque Foundation for Science, Alameda de Urquijo 36-5, 48008 Bilbao, SpainP. JakobssonUniversity of Iceland, Reykjavik, IcelandG. LeloudasDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkD. MalesaniDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkJ. HjorthDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkHjorth, JUniversity of Copenhagen, Copenhagen, DenmarkA. MelandriINAF/Brera Astronomical Observatory, via Bianchi 46, 23807 Merate (LC), ItalyMelandri, AC. G. MundellAstrophysics Research Institute, Liverpool John Moores University, Liverpool Science Park, 146 Brownlow Hill, Liverpool, L3 5RF, UKMundell, CGWiersema, KK. WiersemaDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKD'Avanzo, PP. D’AvanzoINAF/Brera Astronomical Observatory, via Bianchi 46, 23807 Merate (LC), ItalyS. SchulzeInstituto de Astrofsica, Facultad de Fsica, Pontificia Universidad Catlica de Chile, Av. Vicua Mackenna 4860, 782-0436 Macul Santiago, ChileSchulze, SA. GombocFaculty of Mathematics & Physics, University of Ljubljana, Jadranska ulica 19, 1000 Ljubljana, SloveniaGomboc, AT. JohanssonCentre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavik, IcelandJohansson, AZheng, WW. ZhengDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAД. А. КаннMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, 85748 Garching, GermanyKann, DAF. KnustMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, 85748 Garching, GermanyKnust, FK. VarelaMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, 85748 Garching, GermanyVarela, KAkerlof, CWC. AkerlofDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USAJ. S. BloomDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USABloom, JО. БурхоновUlugh Beg Astronomical Institute, 100052, 33 Astronomicheskaya str., Tashkent, UzbekistanBurkhonov, VElizabeth A. CookeSchool of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UKCooke, EJ. A. de DiegoInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 Mexico, D.F., Mexicode Diego, JADhungana, GG. DhunganaDepartment of Physics, Southern Methodist University, Dallas, Texas 75275, USAC. FariñaIsaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canary Islands, SpainFarina, CF. V. FerranteDepartment of Physics, Southern Methodist University, Dallas, Texas 75275, USAFerrante, FVFlewelling, HAH. FlewellingInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822, USAOri D. FoxDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAFox, ODFynbo, JJ. P. U. FynboDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkN. GehrelsNASA Goddard Space Flight Center, MS 665, Greenbelt, MD 20771, USAGehrels, NGeorgiev, LЛ. ГеоргиевInstituto de Astronoma, Universidad Nacional Autnoma de Mxico, Apartado Postal 70-264, 04510 Mexico, D.F., MexicoJ. González‐HernándezInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 Mexico, D.F., MexicoGonzalez, JJJ. GreinerMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, 85748 Garching, GermanyGreiner, JGuever, TTolga GüverDepartment of Astronomy and Space Sciences, Istanbul University Science Faculty, 34119 Istanbul, TurkeyO. E. HartoogAstronomical Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsHatch, NJelinek, MN. A. HatchSchool of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UKM. JelínekInstituto de Astrofsica de Andaluca (IAA-CSIC), Glorieta de la Astronoma s/n, 18008, Granada, SpainKehoe, RR. KehoeDepartment of Physics, Southern Methodist University, Dallas, Texas 75275, USAKlose, SS. KloseThringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, GermanyKlunko, EKopae, DE. KlunkoInstitute of Solar-Terrestrial Physics, Siberian department of the Russian Academy of Sciences, p/o box 291, Lermontov str., 126a, 664033 Irkutsk, RussiaD. KopačFaculty of Mathematics & Physics, University of Ljubljana, Jadranska ulica 19, 1000 Ljubljana, SloveniaKutyrev, AKrugly, YA. KutyrevNASA Goddard Space Flight Center, MS 665, Greenbelt, MD 20771, USAYu. N. KruglyLee, WHLevan, AW. H. LeeInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 Mexico, D.F., MexicoLinkov, VA. J. LevanDepartment of Physics, University of Warwick, Coventry, CV4 7AL, UKV. LinkovMatkin, AMinikulov, NA. MatkinUssuriysk Astrophysical Observatory, 692533, Primorskiy kray, Ussuriyskiy rayon, s. Gornotayozhnoe, RussiaН. Х. МиникуловInstitute of Astrophysics, Academy of Sciences of Tajikistan, Bukhoro Str. 22, 734042 Dushanbe, TajikistanMolotov, IProchaska, JXI. MolotovKeldysh Institute of Applied Mathematics, 125047 Miusskaya sq., 4, Moscow, RussiaJ. X. ProchaskaAstronomy Department, University of California at Santa Cruz, CA 95064, USARieher, MGM. G. RicherInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 106, 22800 Ensenada, Baja California, MexicoRoman-Zuniga, CGC. Román-ZúñigaInstituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 Mexico, D.F., MexicoRumyantsev, VV. RumyantsevCrimean Astrophysical Observatory, Taras Shevchenko National University of Kyiv, 98409, pgt. Nauchny, Crimea, UkraineSanchez-Ramirez, RSteele, IAR. Sánchez-RamírezAstronomy Department, University of California at Santa Cruz, CA 95064, USAI. A. SteeleAstrophysics Research Institute, Liverpool John Moores University, Liverpool Science Park, 146 Brownlow Hill, Liverpool, L3 5RF, UKTanvir, NRVolnova, AN. R. TanvirDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKWatson, AMA. VolnovaSpace Research Institute, 117997, 84/32 Profsoyuznaya str., Moscow, RussiaXu, DA. M. WatsonInstituto de Astronoma, Universidad Nacional Autnoma de Mxico, Apartado Postal 70-264, 04510 Mexico, D.F., MexicoD. XuDark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen , 2100, DenmarkYuan, FF. YuanResearch School of Astronomy and Astrophysics, The Australian National University, ACT, 2611 Canberra, Australia
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We present optical and near-infrared (NIR) photometry for three gamma-ray burst supernovae (GRB-SNe): GRB 120729A, GRB 130215A/SN 2013ez, and GRB 130831A/SN 2013fu. For GRB 130215A/SN 2013ez, we also present optical spectroscopy at tt 0 = 16.1 d, which covers rest-frame 3000-6250 . Based on Fe 5169 and Si 6355, our spectrum indicates an unusually low expansion velocity of 4000-6350 km s -1 , the lowest ever measured for a GRB-SN. Additionally, we determined the brightness and shape of each accompanying SN relative to a template supernova (SN 1998bw), which were used to estimate the amount of nickel produced via nucleosynthesis during each explosion. We find that our derived nickel masses are typical of other GRB-SNe, and greater than those of SNe Ibc that are not associated with GRBs. For GRB 130831A/SN 2013fu, we used our well-sampled R-band light curve (LC) to estimate the amount of ejecta mass and the kinetic energy of the SN, finding that these too are similar to other GRB-SNe. For GRB 130215A, we took advantage of contemporaneous optical/NIR observations to construct an optical/NIR bolometric LC of the afterglow. We fit the bolometric LC with the millisecond magnetar model of Zhang & Mszros (2001, ApJ, 552, L35), which considers dipole radiation as a source of energy injection to the forward shock powering the optical/NIR afterglow. Using this model we derive an initial spin period of P = 12 ms and a magnetic field of B = 1.1 10 15 G, which are commensurate with those found for proposed magnetar central engines of other long-duration GRBs.
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