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GRB 081007 AND GRB 090424: THE SURROUNDING MEDIUM, OUTFLOWS, AND SUPERNOVAE

文献类型:期刊论文

AuthorJin, Zhi-Ping1,2; Covino, Stefano1; Della Valle, Massimo3,4; Ferrero, Patrizia5,6; Fugazza, Dino1; Malesani, Daniele7; Melandri, Andrea1; Pian, Elena8,9; Salvaterra, Ruben10; Bersier, David11
SourceASTROPHYSICAL JOURNAL
Issued Date2013-09-10
Volume774Issue:2Pages:0
ISSN0004-637X
Keywordgamma-ray: burst: individual (GRB 081007, GRB 090424) ISM: jets and outflows supernovae: individual (SN 2008hw)
Corresponding AuthorJin, ZP (reprint author), INAF Osservatorio Astron Brera, Via Emilio Bianchi 46, I-23807 Merate, LC, Italy. Email: jin@pmo.ac.cn
English AbstractWe discuss the results of the analysis of multi-wavelength data for the afterglows of GRB 081007 and GRB 090424, two bursts detected by Swift. One of them, GRB 081007, also shows a spectroscopically confirmed supernova, SN 2008hw, which resembles SN 1998bw in its absorption features, while the maximum magnitude may be fainter, up to 0.7 mag, than observed in SN 1998bw. Bright optical flashes have been detected in both events, which allows us to derive solid constraints on the circumburst-matter density profile. This is particularly interesting in the case of GRB 081007, whose afterglow is found to be propagating into a constant-density medium, yielding yet another example of a gamma-ray burst (GRB) clearly associated with a massive-star progenitor which did not sculpt the surroundings with its stellar wind. There is no supernova component detected in the afterglow of GRB 090424, likely due to the brightness of the host galaxy, comparable to the Milky Way. We show that the afterglow data are consistent with the presence of both forward-and reverse-shock emission powered by relativistic outflows expanding into the interstellar medium. The absence of optical peaks due to the forward shock strongly suggests that the reverse-shock regions should be mildly magnetized. The initial Lorentz factor of outflow of GRB 081007 is estimated to be Gamma similar to 200, while for GRB 090424 a lower limit of Gamma > 170 is derived. We also discuss the prompt emission of GRB 081007, which consists of just a single pulse. We argue that neither the external forward-shock model nor the shock-breakout model can account for the prompt emission data and suggest that the single-pulse-like prompt emission may be due to magnetic energy dissipation of a Poynting-flux-dominated outflow or to a dissipative photosphere.
SubjectAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectAstronomy & Astrophysics
WOS Subject ExtendedAstronomy & Astrophysics
WOS Keyword PlusGAMMA-RAY BURST ; STAR-FORMING GALAXIES ; REVERSE-SHOCK ; OPTICAL AFTERGLOWS ; INFRARED-EMISSION ; PROMPT EMISSION ; FIREBALL MODEL ; LORENTZ FACTOR ; MASSIVE STAR ; LIGHT CURVES
Indexed TypeSCI
Language英语
WOS IDWOS:000323888900023
Available Date2014-01-08
源URL[http://libir.pmo.ac.cn/handle/332002/9780]  
Collection紫金山天文台_暗物质和空间天文实验室
Affiliation1.INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
3.INAF Osservatorio Astron Capodimonte, I-80131 Naples, Italy
4.Int Ctr Relativist Astrophys Network, I-65122 Pescara, Italy
5.IAC, E-38200 Tenerife, Spain
6.ULL, Dept Astrofis, E-38205 Tenerife, Spain
7.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen O, Denmark
8.Scuola Normale Super Pisa, I-56126 Pisa, Italy
9.INAF Ist Astrofis Spaziale & Fis Cosm, I-40129 Bologna, Italy
10.INAF IASF Milano, I-20133 Milan, Italy
Recommended Citation
GB/T 7714
Jin, Zhi-Ping,Covino, Stefano,Della Valle, Massimo,et al. GRB 081007 AND GRB 090424: THE SURROUNDING MEDIUM, OUTFLOWS, AND SUPERNOVAE[J]. ASTROPHYSICAL JOURNAL,2013,774(2):0.
APA Jin, Zhi-Ping.,Covino, Stefano.,Della Valle, Massimo.,Ferrero, Patrizia.,Fugazza, Dino.,...&Wozniak, Przemek.(2013).GRB 081007 AND GRB 090424: THE SURROUNDING MEDIUM, OUTFLOWS, AND SUPERNOVAE.ASTROPHYSICAL JOURNAL,774(2),0.
MLA Jin, Zhi-Ping,et al."GRB 081007 AND GRB 090424: THE SURROUNDING MEDIUM, OUTFLOWS, AND SUPERNOVAE".ASTROPHYSICAL JOURNAL 774.2(2013):0.

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