Indexado en

Licencia y uso

Citaciones

Cited 48 times in

Cited 46 times in

Altmetrics

Grant support

The USRA coauthors gratefully acknowledge NASA funding through contract NNM13AA43C. The UAH coauthors gratefully acknowledge NASA funding from cooperative agreement NNM11AA01A and that this work was made possible in part by a grant of high performance computing resources and technical support from the Alabama Supercomputer Authority. E.B. is supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, and C.M. is supported by an appointment to the NASA Postdoctoral Program at the Marshall Space Flight Center, administered by Universities Space Research Association under contract with NASA. C.M.H. and C.A.W.-H. gratefully acknowledge NASA funding through the Fermi GBM project. R.G. and J.G. are supported by the Israel Science Foundation under grant No. 719/14. Support for the German contribution to GBM was provided by the Bundesministerium fur Bildung und Forschung (BMBF) via the Deutsches Zentrum fur Luft und Raumfahrt (DLR) under contract number 50 QV 0301., This work was performed in part under DOE Contract DE-AC02-76SF00515 and support by JSPS KAKENHI grant No. JP17H06362, the JSPS Leading Initiative for Excellent Young Researchers program, and Sakigake 2018 Project of Kanazawa University (M.A.).

Análisis de autorías institucional

Compartir

Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-energy Emission from Prompt to Afterglow

Publicado en:ASTROPHYSICAL JOURNAL. 890 (1): 9- - 2020-02-10 890(1), DOI: 10.3847/1538-4357/ab5b05

Autores: Ajello, M; Arimoto, M; Axelsson, M; Baldini, L; Barbiellini, G; Bastieri, D; Bellazzini, R; Berretta, A; Bissaldi, E; Blandford, R D; Bonino, R; Bottacini, E; Bregeon, J; Bruel, P; Buehler, R; Burns, E; Buson, S; Cameron, R A; Caputo, R; Caraveo, P A; Cavazzuti, E; Chen, S; Chiaro, G; Ciprini, S; Cohen-Tanugi, J; Costantin, D; Cutini, S; D'Ammando, F; DeKlotz, M; Luque, P de la Torre; de Palma, F; Desai, A; Di Lalla, N; Di Venere, L; Dirirsa, F Fana; Fegan, S J; Franckowiak, A; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Giglietto, N; Gill, R; Giordano, F; Giroletti, M; Granot, J; Green, D; Grenier, I A; Grondin, M -H; Guiriec, S; Hays, E; Horan, D; Johannesson, G; Kocevski, D; Kovac'evic', M; Kuss, M; Larsson, S; Latronico, L; Lemoine-Goumard, M; Li, J; Liodakis, I; Longo, F; Loparco, F; Lovellette, M N; Lubrano, P; Maldera, S; Malyshev, D; Manfreda, A; Marti-Devesa, G; Mazziotta, M N; McEnery, J E; Mereu, I; Meyer, M; Michelson, P F; Mitthumsiri, W; Mizuno, T; Monzani, M E; Moretti, E; Morselli, A; Moskalenko, I V; Negro, M; Nuss, E; Omodei, N; Orienti, M; Orlando, E; Palatiello, M; Paliya, V S; Paneque, D; Pei, Z; Persic, M; Pesce-Rollins, M; Petrosian, V; Piron, F; Poon, H; Porter, T A; Principe, G; Racusin, J L; Raino, S; Rando, R; Rani, B; Razzano, M; Razzaque, S; Reimer, A; Reimer, O; Ryde, F; Parkinson, P M Saz; Serini, D; Sgro, C; Siskind, E J; Spandre, G; Spinelli, P; Tajima, H; Takagi, K; Takahashi, M N; Tak, D; Thayer, J B; Thompson, D J; Torres, D F; Troja, E; Valverde, J; Van Klaveren, B; Wood, K; Yassine, M; Zaharijas, G; Mailyan, B; Bhat, P N; Briggs, M S; Cleveland, W; Giles, M; Goldstein, A; Hui, M; Malacaria, Christian; Preece, R; Roberts, O J; Veres, P; Wilson-Hodge, C; von Kienlin, A; Cenko, S B; O'Brien, P; Beardmore, A P; Lien, A; Osborne, J P; Tohuvavohu, A; D'Elia, V; D'Ai, A; Perri, M; Gropp, J; Klingler, N; Capalbi, M; Tagliaferri, G; Stamatikos, M; De Pasquale, M

Afiliaciones

Resumen

We report on the observations of gamma-ray burst (GRB) 190114C by the Fermi Gamma -ray Space Telescope and the Neil Gehrels Swift Observatory. The prompt gamma-ray emission was detected by the Fermi GRB Monitor (GBM), the Fermi Large Area Telescope (LAT), and the Swift Burst Alert Telescope (BAT) and the long-lived afterglow emission was subsequently observed by the GBM, LAT, Swift X-ray Telescope (XRT), and Swift UV Optical Telescope. The early -time observations reveal multiple emission components that evolve independently, with a delayed power-law component that exhibits significant spectral attenuation above 40 MeV in the first few seconds of the burst. This power-law component transitions to a harder spectrum that is consistent with the afterglow emission observed by the XRT at later times. This afterglow component is clearly identifiable in the GBM and BAT light curves as a slowly fading emission component on which the rest of the prompt emission is superimposed. As a result, we are able to observe the transition from internal-shock- to external-shock-dominated emission. We find that the temporal and spectral evolution of the broadband afterglow emission can be well modeled as synchrotron emission from a forward shock propagating into a wind -like circumstellar environment. We estimate the initial bulk Lorentz factor using the observed high-energy spectral cutoff. Considering the onset of the afterglow component, we constrain the deceleration radius at which this forward shock begins to radiate in order to estimate the maximum synchrotron energy as a function of time. We find that even in the LAT energy range, there exist high-energy photons that are in tension with the theoretical maximum energy that can be achieved through synchrotron emission from a shock. These violations of the maximum synchrotron energy are further compounded by the detection of very high-energy (VHE) emission above 300 GeV by MAGIC concurrent with our observations. We conclude that the observations of VHE photons from GRB 190114C necessitates either an additional emission mechanism at very high energies that is hidden in the synchrotron component in the LAT energy range, an acceleration mechanism that imparts energy to the particles at a rate that is faster than the electron synchrotron energy -loss rate, or revisions of the fundamental assumptions used in estimating the maximum photon energy attainable through the synchrotron process.

Palabras clave