AGILE and Konus-Wind Observations of GRB 190114C: The Remarkable Prompt and Early Afterglow Phases
| Autor: | R. Aptekar, Francesco Lucarelli, V. Vittorini, F. Paoletti, Dmitry S. Svinkin, M. Feroci, C. Pittori, I. Donnarumma, Y. Evangelista, M. Romani, D. Frederiks, P. A. Caraveo, F. Fuschino, P. W. Cattaneo, A. Tsvetkova, F. Lazzarotto, G. Piano, Martino Marisaldi, N. Parmiggiani, A. Morselli, F. Longo, M. Pilia, M. Cardillo, C. Casentini, E. Costa, Arnaud Ferrari, M. Tavani, A. Ursi, M. Galli, F. Verrecchia, A. Giuliani, G. Barbiellini, Claudio Labanti, A. Trois, L. A. Antonelli, A. W. Chen, A. Argan, Andrea Bulgarelli, S. Vercellone |
|---|---|
| Přispěvatelé: | Ursi, A., Tavani, M., Frederiks, D. D., Romani, M., Verrecchia, F., Marisaldi, M., Aptekar, R. L., Antonelli, L. A., Argan, A., Bulgarelli, A., Barbiellini, G., Caraveo, P., Cardillo, M., Casentini, C., Cattaneo, P. W., Chen, A., Costa, E., Donnarumma, I., Evangelista, Y., Feroci, M., Ferrari, A., Fuschino, F., Galli, M., Giuliani, A., Labanti, C., Lazzarotto, F., Longo, F., Lucarelli, F., Morselli, A., Paoletti, F., Parmiggiani, N., Piano, G., Pilia, M., Pittori, C., Svinkin, D. S., Trois, A., Tsvetkova, A. E., Vercellone, S., Vittorini, V. |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena Flux Astrophysics 01 natural sciences Gamma-ray transient sources 0103 physical sciences Radiative transfer Gamma-ray transient sources (1853) Adiabatic process 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics Gamma-ray astronomy Gamma-ray astronomy (628) Astronomy and Astrophysics Spectral component Afterglow Space and Planetary Science Gamma-ray bursts (629) Gamma-ray bursts Gamma-ray burst Fermi Gamma-ray Space Telescope |
| Zdroj: | The Astrophysical Journal. 904:133 |
| ISSN: | 1538-4357 |
| Popis: | GRB 190114C represents a breakthrough for the physics of gamma-ray bursts (GRBs), being the first GRB with delayed emission above 300 GeV, as reported by MAGIC. We present in this paper the sub-MeV/MeV data of the prompt and early afterglow emissions of GRB 190114C, as detected by AGILE and Konus-Wind, in the 20 keV-100 MeV energy range. The first stages of the burst exhibit multiple emission components, associated with an interesting spectral evolution. The first 2 s of the prompt emission can be described by a single "Band-like" spectral component. The successive 4 s show the presence of an additional high-energy spectral component, which quickly evolves into a "hard-flat" component of the νFν spectrum, extending up to 10-100 MeV and likely produced by inverse Compton radiation, whose onset and evolution are clearly shown in our data. After this phase, the νFν spectrum evolves into a "V shape," showing the persistence and spectral hardening of the additional high-energy component in substantial agreement with Fermi and Swift results. We also analyze the first ∼200 s of the early afterglow that show a reflaring episode near T0 + 15 s. We identify a new, so-far-unnoticed flux temporal break near T0 + 100 s, which is detected in hard X-rays by both Konus-Wind and INTEGRAL/SPI-ACS. We find this break incompatible with the commonly assumed adiabatic evolution of a fireball in a constant-density medium. We interpret this break as a consequence of radiative evolution of the early afterglow from a fireball expanding in a wind-like circumburst medium. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|