Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows
We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a p...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
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Institute of Physics Publishing, Inc.
2013
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/42051 |
| _version_ | 1848756312282759168 |
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| author | Moin, A. Chandra, P. Miller-Jones, James Tingay, Steven Taylor, G. Frail, D. Wang, Z. Reynolds, Cormac Phillips, C. |
| author_facet | Moin, A. Chandra, P. Miller-Jones, James Tingay, Steven Taylor, G. Frail, D. Wang, Z. Reynolds, Cormac Phillips, C. |
| author_sort | Moin, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a plateau phase with a very shallow rise. This observed plateau phase was believed to be due to a continued energy injection mechanism that powered the forward shock, giving rise to an unusual and long-lasting afterglow. The radio afterglow of GRB 100418a was detectable several weeks after the prompt emission. We conducted long-term monitoring observations of the afterglow and attempted to test the energy injection model advocating that the continuous energy injection is due to shells of material moving at a wide range of Lorentz factors. We obtained an upper limit of γ < 7 for the expansion rate of the GRB 100418a radio afterglow, indicating that the range-of-Lorentz factor model could only be applicable for relatively slow-moving ejecta. A preferred explanation could be that continued activity of the central engine may have powered the long-lasting afterglow. |
| first_indexed | 2025-11-14T09:10:12Z |
| format | Journal Article |
| id | curtin-20.500.11937-42051 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:10:12Z |
| publishDate | 2013 |
| publisher | Institute of Physics Publishing, Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-420512017-09-13T14:19:38Z Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows Moin, A. Chandra, P. Miller-Jones, James Tingay, Steven Taylor, G. Frail, D. Wang, Z. Reynolds, Cormac Phillips, C. radio continuum: general radiation mechanisms: non-thermal gamma-ray burst: individual (GRB 100418a) relativistic processes outflows stars: winds We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a plateau phase with a very shallow rise. This observed plateau phase was believed to be due to a continued energy injection mechanism that powered the forward shock, giving rise to an unusual and long-lasting afterglow. The radio afterglow of GRB 100418a was detectable several weeks after the prompt emission. We conducted long-term monitoring observations of the afterglow and attempted to test the energy injection model advocating that the continuous energy injection is due to shells of material moving at a wide range of Lorentz factors. We obtained an upper limit of γ < 7 for the expansion rate of the GRB 100418a radio afterglow, indicating that the range-of-Lorentz factor model could only be applicable for relatively slow-moving ejecta. A preferred explanation could be that continued activity of the central engine may have powered the long-lasting afterglow. 2013 Journal Article http://hdl.handle.net/20.500.11937/42051 10.1088/0004-637X/779/2/105 Institute of Physics Publishing, Inc. fulltext |
| spellingShingle | radio continuum: general radiation mechanisms: non-thermal gamma-ray burst: individual (GRB 100418a) relativistic processes outflows stars: winds Moin, A. Chandra, P. Miller-Jones, James Tingay, Steven Taylor, G. Frail, D. Wang, Z. Reynolds, Cormac Phillips, C. Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title | Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title_full | Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title_fullStr | Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title_full_unstemmed | Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title_short | Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows |
| title_sort | radio observations of grb 100418a: test of an energy injection model explaining long-lasting grb afterglows |
| topic | radio continuum: general radiation mechanisms: non-thermal gamma-ray burst: individual (GRB 100418a) relativistic processes outflows stars: winds |
| url | http://hdl.handle.net/20.500.11937/42051 |