Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B
We present high-cadence multifrequency radio observations of the long gamma-ray burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with the Meer Karoo Array Telescope (MeerKAT, 1.3 GHz) and ArcminuteMicrokelvin Ima...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2020
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DE180100346 http://hdl.handle.net/20.500.11937/90303 |
| _version_ | 1848765365321990144 |
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| author | Rhodes, L. Horst, A.J.V.D. Fender, R. Monageng, I.M. Anderson, Gemma Antoniadis, J. Bietenholz, M.F. Böttcher, M. Bright, J.S. Green, D.A. Kouveliotou, C. Kramer, M. Motta, S.E. Wijers, R.A.M.J. Williams, D.R.A. Woudt, P.A. |
| author_facet | Rhodes, L. Horst, A.J.V.D. Fender, R. Monageng, I.M. Anderson, Gemma Antoniadis, J. Bietenholz, M.F. Böttcher, M. Bright, J.S. Green, D.A. Kouveliotou, C. Kramer, M. Motta, S.E. Wijers, R.A.M.J. Williams, D.R.A. Woudt, P.A. |
| author_sort | Rhodes, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present high-cadence multifrequency radio observations of the long gamma-ray burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with the Meer Karoo Array Telescope (MeerKAT, 1.3 GHz) and ArcminuteMicrokelvin Imager-Large Array (AMI-LA, 15.5 GHz) began one day post-burst and lasted nearly 200 d. We used complementary data from Swift X-Ray Telescope (XRT), which ran to 100 d post-burst. We detected a likely forward shock component with bothMeerKAT and XRT up to over 100 d post-burst. Conversely, the AMI-LA light curve appears to be dominated by reverse shock emission until around 70 d post-burst when the afterglow flux drops below the level of the host galaxy. We also present previously unpublished observations of the other H.E.S.S.-detected GRB, GRB 180720B from AMILA, which shows likely forward shock emission that fades in less than 10 d. We present a comparison between the radio emission from the three GRBs with detected very high energy (VHE) gamma-ray emission and a sensitivity-limited radio afterglow sample. GRB 190829A has the lowest isotropic radio luminosity of any GRB in our sample, but the distribution of luminosities is otherwise consistent, as expected, with the VHE GRBs being drawn from the same parent distribution as the other radio-detected long GRBs. |
| first_indexed | 2025-11-14T11:34:05Z |
| format | Journal Article |
| id | curtin-20.500.11937-90303 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:34:05Z |
| publishDate | 2020 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-903032023-02-10T02:29:42Z Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B Rhodes, L. Horst, A.J.V.D. Fender, R. Monageng, I.M. Anderson, Gemma Antoniadis, J. Bietenholz, M.F. Böttcher, M. Bright, J.S. Green, D.A. Kouveliotou, C. Kramer, M. Motta, S.E. Wijers, R.A.M.J. Williams, D.R.A. Woudt, P.A. Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients gamma-ray burst: individual: GRB 180720B gamma-ray burst: individual: GRB 190829A LIGHT CURVES GRB 970508 IMAGER DEEP GHZ We present high-cadence multifrequency radio observations of the long gamma-ray burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with the Meer Karoo Array Telescope (MeerKAT, 1.3 GHz) and ArcminuteMicrokelvin Imager-Large Array (AMI-LA, 15.5 GHz) began one day post-burst and lasted nearly 200 d. We used complementary data from Swift X-Ray Telescope (XRT), which ran to 100 d post-burst. We detected a likely forward shock component with bothMeerKAT and XRT up to over 100 d post-burst. Conversely, the AMI-LA light curve appears to be dominated by reverse shock emission until around 70 d post-burst when the afterglow flux drops below the level of the host galaxy. We also present previously unpublished observations of the other H.E.S.S.-detected GRB, GRB 180720B from AMILA, which shows likely forward shock emission that fades in less than 10 d. We present a comparison between the radio emission from the three GRBs with detected very high energy (VHE) gamma-ray emission and a sensitivity-limited radio afterglow sample. GRB 190829A has the lowest isotropic radio luminosity of any GRB in our sample, but the distribution of luminosities is otherwise consistent, as expected, with the VHE GRBs being drawn from the same parent distribution as the other radio-detected long GRBs. 2020 Journal Article http://hdl.handle.net/20.500.11937/90303 10.1093/MNRAS/STAA1715 English http://purl.org/au-research/grants/arc/DE180100346 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients gamma-ray burst: individual: GRB 180720B gamma-ray burst: individual: GRB 190829A LIGHT CURVES GRB 970508 IMAGER DEEP GHZ Rhodes, L. Horst, A.J.V.D. Fender, R. Monageng, I.M. Anderson, Gemma Antoniadis, J. Bietenholz, M.F. Böttcher, M. Bright, J.S. Green, D.A. Kouveliotou, C. Kramer, M. Motta, S.E. Wijers, R.A.M.J. Williams, D.R.A. Woudt, P.A. Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title | Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title_full | Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title_fullStr | Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title_full_unstemmed | Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title_short | Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B |
| title_sort | radio afterglows of very high-energy gamma-ray bursts 190829a and 180720b |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients gamma-ray burst: individual: GRB 180720B gamma-ray burst: individual: GRB 190829A LIGHT CURVES GRB 970508 IMAGER DEEP GHZ |
| url | http://purl.org/au-research/grants/arc/DE180100346 http://hdl.handle.net/20.500.11937/90303 |