Low frequency view of GRB 190114C reveals time varying shock micro-physics
We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 190114C 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 Compa...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2021
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| Online Access: | http://purl.org/au-research/grants/arc/DE180100346 http://hdl.handle.net/20.500.11937/90305 |
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| author | Misra, K. Resmi, L. Kann, D.A. Marongiu, M. Moin, A. Klose, S. Bernardi, G. Postigo, A.D.U. Jaiswal, V.K. Schulze, S. Perley, D.A. Ghosh, A. Dimple, D. Kumar, H. Gupta, R. Michałowski, M.J. Martín, S. Cockeram, A. Cherukuri, S.V. Bhalerao, V. Anderson, Gemma Pandey, S.B. Anupama, G.C. Thöne, C.C. Barway, S. Wieringa, M.H. Fynbo, J.P.U. Habeeb, N. |
| author_facet | Misra, K. Resmi, L. Kann, D.A. Marongiu, M. Moin, A. Klose, S. Bernardi, G. Postigo, A.D.U. Jaiswal, V.K. Schulze, S. Perley, D.A. Ghosh, A. Dimple, D. Kumar, H. Gupta, R. Michałowski, M.J. Martín, S. Cockeram, A. Cherukuri, S.V. Bhalerao, V. Anderson, Gemma Pandey, S.B. Anupama, G.C. Thöne, C.C. Barway, S. Wieringa, M.H. Fynbo, J.P.U. Habeeb, N. |
| author_sort | Misra, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 190114C 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 ∼1 to ∼140 d after the burst and the optical observations were done with three optical telescopes spanning up 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. |
| first_indexed | 2025-11-14T11:34:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-90305 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:34:06Z |
| publishDate | 2021 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-903052023-02-10T02:17:56Z 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. Postigo, A.D.U. Jaiswal, V.K. Schulze, S. Perley, D.A. Ghosh, A. Dimple, D. Kumar, H. Gupta, R. Michałowski, M.J. Martín, S. Cockeram, A. Cherukuri, S.V. Bhalerao, V. Anderson, Gemma Pandey, S.B. Anupama, G.C. Thöne, C.C. Barway, S. Wieringa, M.H. Fynbo, J.P.U. Habeeb, N. Science & Technology Physical Sciences Astronomy & Astrophysics gamma-ray burst general-gamma-ray burst individual-GRB 190114C radio observations GAMMA-RAY-BURST AFTERGLOW LIGHT CURVES HIGH-ENERGY EMISSION REVERSE SHOCK SWIFT-ERA PRE-SWIFT OPTICAL AFTERGLOW RADIO AFTERGLOW SCINTILLATION SYNCHROTRON We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 190114C 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 ∼1 to ∼140 d after the burst and the optical observations were done with three optical telescopes spanning up 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. 2021 Journal Article http://hdl.handle.net/20.500.11937/90305 10.1093/mnras/stab1050 English http://purl.org/au-research/grants/arc/DE180100346 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics gamma-ray burst general-gamma-ray burst individual-GRB 190114C radio observations GAMMA-RAY-BURST AFTERGLOW LIGHT CURVES HIGH-ENERGY EMISSION REVERSE SHOCK SWIFT-ERA PRE-SWIFT OPTICAL AFTERGLOW RADIO AFTERGLOW SCINTILLATION SYNCHROTRON Misra, K. Resmi, L. Kann, D.A. Marongiu, M. Moin, A. Klose, S. Bernardi, G. Postigo, A.D.U. Jaiswal, V.K. Schulze, S. Perley, D.A. Ghosh, A. Dimple, D. Kumar, H. Gupta, R. Michałowski, M.J. Martín, S. Cockeram, A. Cherukuri, S.V. Bhalerao, V. Anderson, Gemma Pandey, S.B. Anupama, G.C. Thöne, C.C. Barway, S. Wieringa, M.H. Fynbo, J.P.U. Habeeb, N. Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title | Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title_full | Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title_fullStr | Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title_full_unstemmed | Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title_short | Low frequency view of GRB 190114C reveals time varying shock micro-physics |
| title_sort | low frequency view of grb 190114c reveals time varying shock micro-physics |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics gamma-ray burst general-gamma-ray burst individual-GRB 190114C radio observations GAMMA-RAY-BURST AFTERGLOW LIGHT CURVES HIGH-ENERGY EMISSION REVERSE SHOCK SWIFT-ERA PRE-SWIFT OPTICAL AFTERGLOW RADIO AFTERGLOW SCINTILLATION SYNCHROTRON |
| url | http://purl.org/au-research/grants/arc/DE180100346 http://hdl.handle.net/20.500.11937/90305 |