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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24189
Title: Limits on Optical Polarization during the Prompt Phase of GRB 140430A
Authors: Kopač, 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, Andrea 
Smith, R. J.
Virgili, F. J.
Castro-Tirado, A. J.
Gorosabel, J.
Järvinen, A.
SANCHEZ RAMIREZ, RUBEN 
Oates, S. R.
Jelínek, M.
Issue Date: 2015
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 813
Issue: 1
First Page: 1
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.
URI: http://hdl.handle.net/20.500.12386/24189
URL: https://iopscience.iop.org/article/10.1088/0004-637X/813/1/1
ISSN: 0004-637X
DOI: 10.1088/0004-637X/813/1/1
Bibcode ADS: 2015ApJ...813....1K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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