Limits on optical polarization during the prompt phase of GRB 140430A

D. Kopac, C. G. Mundell, J. Japelj, D. M. Arnold, I. A. Steele, C. Guidorzi, S. Dichiara, S. Kobayashi, A. Gomboc, R. M. Harrison, G. P. Lamb, A. Melandri, R. J. Smith, F. J. Virgili, A. J. Castro-Tirado, J. Gorosabel, A. Järvinen, R. Sánchez-Ramárez, S. R. Oates, M. Jelánek

Research output: Contribution to journalArticle

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Abstract

Gamma-ray burst GRB 140430A was detected by the Swift satellite and observed promptly with the imaging polarimeter RINGO3 mounted on the Liverpool Telescope, with observations beginning while the prompt γ-ray emission was still ongoing. In this paper, we present densely sampled (10-s temporal resolution) early optical light curves (LCs) in 3 optical bands and limits to the degree of optical polarization. We compare optical, X-ray, and gamma-ray properties and present an analysis of the optical emission during a period of high-energy flaring. The complex optical LC cannot be explained merely with a combination of forward and reverse shock emission from a standard external shock, implying additional contribution of emission from internal shock dissipation. We estimate an upper limit for time averaged optical polarization during the prompt phase to be as low as P <12% (1σ). This suggests that the optical flares and early afterglow emission in this GRB are not highly polarized. Alternatively, time averaging could mask the presence of otherwise polarized components of distinct origin at different polarization position angles.

Original languageEnglish
Article number1
JournalAstrophysical Journal
Volume813
Issue number1
DOIs
Publication statusPublished - 1 Nov 2015

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optical polarization
polarization
shock
light curve
gamma rays
polarimeters
afterglows
temporal resolution
gamma ray bursts
flares
light emission
masks
dissipation
telescopes
estimates
x rays
energy

Keywords

  • gamma-ray burst: general
  • gamma-ray burst: individual (GRB 140430A)
  • instrumentation: polarimeters

Cite this

Kopac, D., Mundell, C. G., Japelj, J., Arnold, D. M., Steele, I. A., Guidorzi, C., ... Jelánek, M. (2015). Limits on optical polarization during the prompt phase of GRB 140430A. Astrophysical Journal, 813(1), [1]. https://doi.org/10.1088/0004-637X/813/1/1

Limits on optical polarization during the prompt phase of GRB 140430A. / Kopac, D.; Mundell, C. G.; Japelj, J.; Arnold, D. M.; Steele, I. A.; Guidorzi, C.; Dichiara, S.; Kobayashi, S.; Gomboc, A.; Harrison, R. M.; Lamb, G. P.; Melandri, A.; Smith, R. J.; Virgili, F. J.; Castro-Tirado, A. J.; Gorosabel, J.; Järvinen, A.; Sánchez-Ramárez, R.; Oates, S. R.; Jelánek, M.

In: Astrophysical Journal, Vol. 813, No. 1, 1, 01.11.2015.

Research output: Contribution to journalArticle

Kopac, D, Mundell, CG, Japelj, J, Arnold, DM, Steele, IA, Guidorzi, C, Dichiara, S, Kobayashi, S, Gomboc, A, Harrison, RM, Lamb, GP, Melandri, A, Smith, RJ, Virgili, FJ, Castro-Tirado, AJ, Gorosabel, J, Järvinen, A, Sánchez-Ramárez, R, Oates, SR & Jelánek, M 2015, 'Limits on optical polarization during the prompt phase of GRB 140430A', Astrophysical Journal, vol. 813, no. 1, 1. https://doi.org/10.1088/0004-637X/813/1/1
Kopac, D. ; Mundell, C. G. ; Japelj, J. ; Arnold, D. M. ; Steele, I. A. ; Guidorzi, C. ; Dichiara, S. ; Kobayashi, S. ; Gomboc, A. ; Harrison, R. M. ; Lamb, G. P. ; Melandri, A. ; Smith, R. J. ; Virgili, F. J. ; Castro-Tirado, A. J. ; Gorosabel, J. ; Järvinen, A. ; Sánchez-Ramárez, R. ; Oates, S. R. ; Jelánek, M. / Limits on optical polarization during the prompt phase of GRB 140430A. In: Astrophysical Journal. 2015 ; Vol. 813, No. 1.
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