The unusual afterglow of the Gamma-Ray Burst 100621A
Aims. With the afterglow of GRB 100621A being the brightest detected so far in X-rays, and superb GROND coverage in the optical/NIR during the first few hours, an observational verification of basic fireball predictions seemed possible. Methods. In order to constrain the broad-band spectral energy...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
EDP Sciences
2013
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/43064 |
| _version_ | 1848756587526619136 |
|---|---|
| author | Greiner, J. Kruhler, T. Nardini, M. Filgas, R. Moin, Aquib de Breuck, C. Montenegro-Montes, F. Lundgren, A. Klose, S. Afonso, P. Bertoldi, F. Elliott, J. Kann, D. Knust, F. Menten, K. Nicuesa Guelbenzu, A. Olivares, F. Rau, A. Rossi, A. Schady, P. Schmidl, S. Siringo, G. Spezzi, L. Sudilovsky, V. Tingay, Steven Updike, A. Wang, Z. Weiss, A. Wieringa, M. Wyrowski, F. |
| author_facet | Greiner, J. Kruhler, T. Nardini, M. Filgas, R. Moin, Aquib de Breuck, C. Montenegro-Montes, F. Lundgren, A. Klose, S. Afonso, P. Bertoldi, F. Elliott, J. Kann, D. Knust, F. Menten, K. Nicuesa Guelbenzu, A. Olivares, F. Rau, A. Rossi, A. Schady, P. Schmidl, S. Siringo, G. Spezzi, L. Sudilovsky, V. Tingay, Steven Updike, A. Wang, Z. Weiss, A. Wieringa, M. Wyrowski, F. |
| author_sort | Greiner, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Aims. With the afterglow of GRB 100621A being the brightest detected so far in X-rays, and superb GROND coverage in the optical/NIR during the first few hours, an observational verification of basic fireball predictions seemed possible. Methods. In order to constrain the broad-band spectral energy distribution of the afterglow of GRB 100621A, dedicated observations were performed in the optical/near-infrared with the 7-channel “Gamma-Ray Burst Optical and Near-infrared Detector” (GROND) at the 2.2m MPG/ESO telescope, in the sub-millimeter band with the large bolometer array LABOCA at APEX, and at radio frequencies with ATCA. Utilizing also Swift X-ray observations, we attempt an interpretation of the observational data within the fireball scenario. Results. The afterglow of GRB 100621A shows a very complex temporal as well as spectral evolution. We identify three different emission components, the most spectacular one causing a sudden intensity jump about one hour after the prompt emission. The spectrum of this component is much steeper than the canonical afterglow. We interpret this component using the prescription of Vlasis et al. (2011) for a two-shell collision after the first shell has been decelerated by the circumburst medium. We use the fireball scenario to derive constraints on the microphysical parameters of the first shell. Long-term energy injection into a narrow jet seems to provide an adequate description. Another noteworthy result is the large (AV = 3.6 mag) line-of-sight host extinction of the afterglow in an otherwise extremely blue host galaxy. Conclusions. Some GRB afterglows have shown complex features, and that of GRB 100621A is another good example. Yet, detailed observational campaigns of the brightest afterglows promise to deepen our understanding of the formation of afterglows and the subsequent interaction with the circumburst medium |
| first_indexed | 2025-11-14T09:14:34Z |
| format | Journal Article |
| id | curtin-20.500.11937-43064 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:14:34Z |
| publishDate | 2013 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-430642017-09-13T14:30:06Z The unusual afterglow of the Gamma-Ray Burst 100621A Greiner, J. Kruhler, T. Nardini, M. Filgas, R. Moin, Aquib de Breuck, C. Montenegro-Montes, F. Lundgren, A. Klose, S. Afonso, P. Bertoldi, F. Elliott, J. Kann, D. Knust, F. Menten, K. Nicuesa Guelbenzu, A. Olivares, F. Rau, A. Rossi, A. Schady, P. Schmidl, S. Siringo, G. Spezzi, L. Sudilovsky, V. Tingay, Steven Updike, A. Wang, Z. Weiss, A. Wieringa, M. Wyrowski, F. (stars) gamma-ray burst: individual: GRB 100621A Techniques: photometric (stars) gamma-ray burst: general Aims. With the afterglow of GRB 100621A being the brightest detected so far in X-rays, and superb GROND coverage in the optical/NIR during the first few hours, an observational verification of basic fireball predictions seemed possible. Methods. In order to constrain the broad-band spectral energy distribution of the afterglow of GRB 100621A, dedicated observations were performed in the optical/near-infrared with the 7-channel “Gamma-Ray Burst Optical and Near-infrared Detector” (GROND) at the 2.2m MPG/ESO telescope, in the sub-millimeter band with the large bolometer array LABOCA at APEX, and at radio frequencies with ATCA. Utilizing also Swift X-ray observations, we attempt an interpretation of the observational data within the fireball scenario. Results. The afterglow of GRB 100621A shows a very complex temporal as well as spectral evolution. We identify three different emission components, the most spectacular one causing a sudden intensity jump about one hour after the prompt emission. The spectrum of this component is much steeper than the canonical afterglow. We interpret this component using the prescription of Vlasis et al. (2011) for a two-shell collision after the first shell has been decelerated by the circumburst medium. We use the fireball scenario to derive constraints on the microphysical parameters of the first shell. Long-term energy injection into a narrow jet seems to provide an adequate description. Another noteworthy result is the large (AV = 3.6 mag) line-of-sight host extinction of the afterglow in an otherwise extremely blue host galaxy. Conclusions. Some GRB afterglows have shown complex features, and that of GRB 100621A is another good example. Yet, detailed observational campaigns of the brightest afterglows promise to deepen our understanding of the formation of afterglows and the subsequent interaction with the circumburst medium 2013 Journal Article http://hdl.handle.net/20.500.11937/43064 10.1051/0004-6361/201321284 EDP Sciences fulltext |
| spellingShingle | (stars) gamma-ray burst: individual: GRB 100621A Techniques: photometric (stars) gamma-ray burst: general Greiner, J. Kruhler, T. Nardini, M. Filgas, R. Moin, Aquib de Breuck, C. Montenegro-Montes, F. Lundgren, A. Klose, S. Afonso, P. Bertoldi, F. Elliott, J. Kann, D. Knust, F. Menten, K. Nicuesa Guelbenzu, A. Olivares, F. Rau, A. Rossi, A. Schady, P. Schmidl, S. Siringo, G. Spezzi, L. Sudilovsky, V. Tingay, Steven Updike, A. Wang, Z. Weiss, A. Wieringa, M. Wyrowski, F. The unusual afterglow of the Gamma-Ray Burst 100621A |
| title | The unusual afterglow of the Gamma-Ray Burst 100621A |
| title_full | The unusual afterglow of the Gamma-Ray Burst 100621A |
| title_fullStr | The unusual afterglow of the Gamma-Ray Burst 100621A |
| title_full_unstemmed | The unusual afterglow of the Gamma-Ray Burst 100621A |
| title_short | The unusual afterglow of the Gamma-Ray Burst 100621A |
| title_sort | unusual afterglow of the gamma-ray burst 100621a |
| topic | (stars) gamma-ray burst: individual: GRB 100621A Techniques: photometric (stars) gamma-ray burst: general |
| url | http://hdl.handle.net/20.500.11937/43064 |