Synchrotron self-Compton in a radiative-adiabatic fireball scenario: modelling the multiwavelength observations in some Fermi/LAT bursts

Fraija, Nissim; Veres, P.; Betancourt Kamenetskaia, B.; Galvan-Gamez, A.; Dainotti, M. G.; Dichiara, Simone; Becerra, R. L.

doi:10.1093/mnras/stae2190

Synchrotron self-Compton in a radiative-adiabatic fireball scenario: modelling the multiwavelength observations in some Fermi/LAT bursts

Journal Article · Tue Oct 08 00:00:00 EDT 2024 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stae2190· OSTI ID:2586160

^[1]; ^[2]; ^[3]; ^[1]; ^[4]; ^[5]; ^[6]

Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
Univ. of Alabama, Huntsville, AL (United States)
Technical Univ. of Munich (Germany); Max Planck Inst. fuer Physik, Munich (Germany)
National Astronomical Observatory of Japan (NAOJ), Tokyo (Japan); Graduate Univ. for Advanced Studies (SOKENDAI), Tokyo (Japan); Space Science Institute, Boulder, CO (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Pennsylvania State Univ., University Park, PA (United States)
Univ. degli Studi di Roma Tor Vergata (Italy)

Energetic GeV photons expected from the closest and the most energetic Gamma-ray bursts (GRBs) provide a unique opportunity to study the very-high-energy emission as well as the possible correlations with lower energy bands in realistic GRB afterglow models. In the standard GRB afterglow model, the relativistic homogeneous shock is usually considered to be fully adiabatic, however, it could be partially radiative. Based on the external forward-shock scenario in both stellar wind and constant-density medium, we present a radiative-adiabatic analytical model of the synchrotron self-Compton (SSC) and synchrotron processes considering an electron energy distribution with a power-law index of $$1\lt p\lt 2$$ and $$2\le p$$. We show that the SSC scenario plays a relevant role in the radiative parameter $$\epsilon$$, leading to a prolonged evolution during the slow cooling regime. In a particular case, we derive the Fermi/LAT light curves together with the photons with energies $$\ge 100$$ MeV in a sample of nine bursts from the second Fermi/LAT GRB catalogue that exhibited temporal and spectral indices with $$\gtrsim 1.5$$ and $$\approx 2$$, respectively. These events can hardly be described with closure relations of the standard synchrotron afterglow model, and also exhibit energetic photons above the synchrotron limit. We have modelled the multiwavelength observations of our sample to constrain the microphysical parameters, the circumburst density, the bulk Lorentz factor, and the mechanism responsible for explaining the energetic GeV photons.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2586160

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 534; ISSN 1365-2966; ISSN 0035-8711

Publisher:: Oxford University Press (OUP)Copyright Statement

Country of Publication:: United States

Language:: English

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Searches for Neutrinos from Gamma-Ray Bursts Using the IceCube Neutrino Observatory Abbasi, R.; Ackermann, M.; Adams, J. The Astrophysical Journal, Vol. 939, Issue 2 https://doi.org/10.3847/1538-4357/ac9785	journal	November 2022
Off-axis Afterglow Closure Relations and Fermi-LAT Detected Gamma-Ray Bursts Fraija, N.; Dainotti, M. G.; Levine, D. The Astrophysical Journal, Vol. 958, Issue 2 https://doi.org/10.3847/1538-4357/acfb7f	journal	November 2023
Incremental Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S.; Acero, F.; Baldini, L. The Astrophysical Journal Supplement Series, Vol. 260, Issue 2 https://doi.org/10.3847/1538-4365/ac6751	journal	June 2022
An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi -GBM Detection of GRB 170817A Goldstein, A.; Veres, P.; Burns, E. The Astrophysical Journal, Vol. 848, Issue 2 https://doi.org/10.3847/2041-8213/aa8f41	journal	October 2017
Gravitational Waves and Gamma-Rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A Abbott, B. P.; Abbott, R.; Abbott, T. D. The Astrophysical Journal, Vol. 848, Issue 2 https://doi.org/10.3847/2041-8213/aa920c	journal	October 2017
Analysis and Modeling of the Multi-wavelength Observations of the Luminous GRB 190114C Fraija, N.; Dichiara, S.; Pedreira, A. C. Caligula do E. S. The Astrophysical Journal, Vol. 879, Issue 2 https://doi.org/10.3847/2041-8213/ab2ae4	journal	July 2019
Bright Gamma-Ray Flares Observed in GRB 131108A Ajello, M.; Arimoto, M.; Asano, K. The Astrophysical Journal, Vol. 886, Issue 2 https://doi.org/10.3847/2041-8213/ab564f	journal	November 2019
A prompt extra component in the high energy spectrum of GRB 131108A Giuliani, A.; Mereghetti, S.; Marisaldi, M. arXiv https://doi.org/10.48550/arXiv.1407.0238	preprint	January 2014
Flat Spectrum Gamma Ray Burst Afterglows Bhattacharya, Dipankar arXiv https://doi.org/10.48550/arXiv.astro-ph/0104250	text	January 2001

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