TY - JOUR
T1 - Time-varying Polarized Gamma-Rays from GRB 160821A
T2 - Evidence for Ordered Magnetic Fields
AU - Sharma, Vidushi
AU - Iyyani, Shabnam
AU - Bhattacharya, Dipankar
AU - Chattopadhyay, Tanmoy
AU - Rao, A. R.
AU - Aarthy, E.
AU - Vadawale, Santosh V.
AU - Mithun, N. P.S.
AU - Bhalerao, Varun B.
AU - Ryde, Felix
AU - Pe'Er, Asaf
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019/9/1
Y1 - 2019/9/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072612704&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ab3a48
DO - 10.3847/2041-8213/ab3a48
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SN - 2041-8205
VL - 882
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L10
ER -