Low frequency view of GRB 190114C reveals time varying shock micro-physics
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Low frequency view of GRB 190114C reveals time varying shock micro-physics. / Misra, K.; Resmi, L.; Kann, D. A.; Marongiu, M.; Moin, A.; Klose, S.; Bernardi, G.; de Ugarte Postigo, A.; Jaiswal, V. K.; Schulze, S.; Perley, D. A.; Ghosh, A.; Dimple, Dimple; Kumar, H.; Gupta, R.; Michalowski, M. J.; Martin, S.; Cockeram, A.; Cherukuri, S.; Bhalerao, V.; Anderson, G. E.; Pandey, S. B.; Anupama, G. C.; Thone, C. C.; Barway, S.; Wieringa, M. H.; Fynbo, J. P. U.; Habeeb, N.
I: Monthly Notices of the Royal Astronomical Society, Bind 504, Nr. 4, 04.07.2021, s. 5685-5701.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Low frequency view of GRB 190114C reveals time varying shock micro-physics
AU - Misra, K.
AU - Resmi, L.
AU - Kann, D. A.
AU - Marongiu, M.
AU - Moin, A.
AU - Klose, S.
AU - Bernardi, G.
AU - de Ugarte Postigo, A.
AU - Jaiswal, V. K.
AU - Schulze, S.
AU - Perley, D. A.
AU - Ghosh, A.
AU - Dimple, Dimple
AU - Kumar, H.
AU - Gupta, R.
AU - Michalowski, M. J.
AU - Martin, S.
AU - Cockeram, A.
AU - Cherukuri, S.
AU - Bhalerao, V.
AU - Anderson, G. E.
AU - Pandey, S. B.
AU - Anupama, G. C.
AU - Thone, C. C.
AU - Barway, S.
AU - Wieringa, M. H.
AU - Fynbo, J. P. U.
AU - Habeeb, N.
PY - 2021/7/4
Y1 - 2021/7/4
N2 - We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 1901140 at a redshift of z = 0.425, which was detected by the Major Atmospheric Gamma Imaging Cherenkov telescope. Our observations with Atacama Large Millimeter/submillitmeter Array, Australia Telescope Compact Array, and upgraded Giant Metre-wave Radio Telescope were obtained by our low frequency observing campaign and range from similar to 1 to similar to 140 d after the burst and the optical observations were done with three optical telescopes spanning up to similar to 25 d after the burst. Long-term radio/mm observations reveal the complex nature of the afterglow, which does not follow the spectral and temporal closure relations expected from the standard afterglow model. We find that the microphysical parameters of the external forward shock, representing the share of shock-created energy in the non-thermal electron population and magnetic field, are evolving with time. The inferred kinetic energy in the blast-wave depends strongly on the assumed ambient medium density profile, with a constant density medium demanding almost an order of magnitude higher energy than in the prompt emission, while a stellar wind-driven medium requires approximately the same amount energy as in prompt emission.
AB - We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 1901140 at a redshift of z = 0.425, which was detected by the Major Atmospheric Gamma Imaging Cherenkov telescope. Our observations with Atacama Large Millimeter/submillitmeter Array, Australia Telescope Compact Array, and upgraded Giant Metre-wave Radio Telescope were obtained by our low frequency observing campaign and range from similar to 1 to similar to 140 d after the burst and the optical observations were done with three optical telescopes spanning up to similar to 25 d after the burst. Long-term radio/mm observations reveal the complex nature of the afterglow, which does not follow the spectral and temporal closure relations expected from the standard afterglow model. We find that the microphysical parameters of the external forward shock, representing the share of shock-created energy in the non-thermal electron population and magnetic field, are evolving with time. The inferred kinetic energy in the blast-wave depends strongly on the assumed ambient medium density profile, with a constant density medium demanding almost an order of magnitude higher energy than in the prompt emission, while a stellar wind-driven medium requires approximately the same amount energy as in prompt emission.
KW - gamma-ray burst
KW - general-gamma-ray burst
KW - individual-GRB 190114C
KW - radio observations
KW - GAMMA-RAY-BURST
KW - AFTERGLOW LIGHT CURVES
KW - HIGH-ENERGY EMISSION
KW - REVERSE SHOCK
KW - SWIFT-ERA
KW - PRE-SWIFT
KW - OPTICAL AFTERGLOW
KW - RADIO AFTERGLOW
KW - SCINTILLATION
KW - SYNCHROTRON
U2 - 10.1093/mnras/stab1050
DO - 10.1093/mnras/stab1050
M3 - Journal article
VL - 504
SP - 5685
EP - 5701
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 4
ER -
ID: 279141021