A possible bright blue supernova in the afterglow of GRB 020305

J. Gorosabel, J. P U Fynbo, A. Fruchter, A. Levan, J. Hjorth, P. Nugent, A. J. Castro-Tirado, J. M. Castro Cerón, J. Rhoads, D. Bersier, I. Burud

Research output: Contribution to journalArticle

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Abstract

We report on ground-based and HST(+STIS) imaging of the afterglow and host galaxy of the Gamma-Ray Burst (GRB) of March 5, 2002. The GRB occurred in a R = 25.17 ± 0.14 galaxy, which apparently is part of an interacting system. The lightcurve of the optical afterglow shows a rebrightening, or at least a plateau, 12-16 days after the gamma-ray event. UBVRIK' multi-band imaging of the afterglow ∼12 days after the GRB reveals a blue spectral energy distribution (SED). The SED is consistent with a power-law with a spectral index of β= -0.63 ± 0.16, but there is tentative evidence for deviations away from a power-law. Unfortunately, a spectroscopic redshift has not been secured for GRB 020305. From the SED we impose a redshift upper limit of z ≲2.8, hence excluding the pseudo redshift of 4.6 reported for this burst. We discuss the possibilities for explaining the lightcurve, SED and host galaxy properties for GRB 020305. The most natural interpretation of the lightcurve and the SED is an associated supernova (SN). Our data can not precisely determine the redshift of the GRB. The most favoured explanation is a low redshift (z ∼ 0.2) SN, but a higher redshift (z ≳ 0.5) SN can not be excluded. We also discuss less likely scenarios not based on SNe, like a burst occurring in a z = 2.5 galaxy with an extinction curve similar to that of the Milky Way.

Original languageEnglish (US)
Pages (from-to)411-418
Number of pages8
JournalAstronomy and Astrophysics
Volume437
Issue number2
DOIs
StatePublished - Jul 2005
Externally publishedYes

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afterglows
gamma ray bursts
supernovae
spectral energy distribution
galaxies
energy
power law
bursts
extinction
distribution
plateau
plateaus
gamma rays
deviation
curves

Keywords

  • Gamma rays: Bursts
  • Techniques: Photometric

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Gorosabel, J., Fynbo, J. P. U., Fruchter, A., Levan, A., Hjorth, J., Nugent, P., ... Burud, I. (2005). A possible bright blue supernova in the afterglow of GRB 020305. Astronomy and Astrophysics, 437(2), 411-418. https://doi.org/10.1051/0004-6361:20052783

A possible bright blue supernova in the afterglow of GRB 020305. / Gorosabel, J.; Fynbo, J. P U; Fruchter, A.; Levan, A.; Hjorth, J.; Nugent, P.; Castro-Tirado, A. J.; Castro Cerón, J. M.; Rhoads, J.; Bersier, D.; Burud, I.

In: Astronomy and Astrophysics, Vol. 437, No. 2, 07.2005, p. 411-418.

Research output: Contribution to journalArticle

Gorosabel, J, Fynbo, JPU, Fruchter, A, Levan, A, Hjorth, J, Nugent, P, Castro-Tirado, AJ, Castro Cerón, JM, Rhoads, J, Bersier, D & Burud, I 2005, 'A possible bright blue supernova in the afterglow of GRB 020305', Astronomy and Astrophysics, vol. 437, no. 2, pp. 411-418. https://doi.org/10.1051/0004-6361:20052783
Gorosabel J, Fynbo JPU, Fruchter A, Levan A, Hjorth J, Nugent P et al. A possible bright blue supernova in the afterglow of GRB 020305. Astronomy and Astrophysics. 2005 Jul;437(2):411-418. https://doi.org/10.1051/0004-6361:20052783
Gorosabel, J. ; Fynbo, J. P U ; Fruchter, A. ; Levan, A. ; Hjorth, J. ; Nugent, P. ; Castro-Tirado, A. J. ; Castro Cerón, J. M. ; Rhoads, J. ; Bersier, D. ; Burud, I. / A possible bright blue supernova in the afterglow of GRB 020305. In: Astronomy and Astrophysics. 2005 ; Vol. 437, No. 2. pp. 411-418.
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abstract = "We report on ground-based and HST(+STIS) imaging of the afterglow and host galaxy of the Gamma-Ray Burst (GRB) of March 5, 2002. The GRB occurred in a R = 25.17 ± 0.14 galaxy, which apparently is part of an interacting system. The lightcurve of the optical afterglow shows a rebrightening, or at least a plateau, 12-16 days after the gamma-ray event. UBVRIK' multi-band imaging of the afterglow ∼12 days after the GRB reveals a blue spectral energy distribution (SED). The SED is consistent with a power-law with a spectral index of β= -0.63 ± 0.16, but there is tentative evidence for deviations away from a power-law. Unfortunately, a spectroscopic redshift has not been secured for GRB 020305. From the SED we impose a redshift upper limit of z ≲2.8, hence excluding the pseudo redshift of 4.6 reported for this burst. We discuss the possibilities for explaining the lightcurve, SED and host galaxy properties for GRB 020305. The most natural interpretation of the lightcurve and the SED is an associated supernova (SN). Our data can not precisely determine the redshift of the GRB. The most favoured explanation is a low redshift (z ∼ 0.2) SN, but a higher redshift (z ≳ 0.5) SN can not be excluded. We also discuss less likely scenarios not based on SNe, like a burst occurring in a z = 2.5 galaxy with an extinction curve similar to that of the Milky Way.",
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AU - Castro-Tirado, A. J.

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