Time-varying polarized gamma-rays from GRB 160821A: evidence for ordered magnetic fields
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Date
2019-09-03
Authors
Sharma, Vidushi
Iyyani, Shabnam
Bhattacharya, Dipankar
Chattopadhyay, Tanmoy
Rao, A. R.
Aarthy, E.
Vadawale, Santosh V.
Mithun, N. P. S.
Bhalerao, Varun B.
Ryde, Felix
Journal Title
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Publisher
Institute of Physics Publishing
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Abstract
GRB 160821A is the third most energetic gamma-ray burst observed by the Fermi gamma-ray space telescope. Based on the observations made by the Cadmium Zinc Telluride Imager on board AstroSat, here we report the most conclusive evidence to date of (i) high linear polarization ( detection), and (ii) variation of polarization angle with time, occurring twice during the rise and decay phase of the burst at 3.5σ and 3.1σ detections, respectively. All confidence levels are reported for two parameters of interest. These observations strongly suggest synchrotron radiation produced in magnetic field lines that are highly ordered on angular scales of 1/Γ, where Γ is the Lorentz factor of the outflow.
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Keywords
Gamma-ray burst , High energy astrophysics , Magnetic fields
Citation
Sharma, V., Iyyani, S., Bhattacharya, D., Chattopadhyay, T., Rao, A. R., Aarthy, E., Vadawale, S. V., Mithun, N. P. S., Bhalerao, V. B., Ryde, F. and Pe’er, A. (2019) 'Time-varying Polarized Gamma-Rays from GRB 160821A: Evidence for Ordered Magnetic Fields', The Astrophysical Journal, 882(1), L10. (9pp.) DOI:10.3847/2041-8213/ab3a48
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©2019. The American Astronomical Society. All rights reserved.