FERMI OBSERVATIONS OF HIGH-ENERGY GAMMA-RAY EMISSION FROM GRB 080825C

By A. Abdo, M. Ackermann, M. Arimoto, K. Asano, W. Atwood, M. Axelsson, L. Baldini, J. Ballet, D. Band, G. Barbiellini and 242 more. 2009

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The Fermi Gamma-ray Space Telescope has opened a new high-energy window in the study of gamma-ray bursts (GRBs). Here we present a thorough analysis of GRB 080825C, which triggered the Fermi Gamma-ray Burst Monitor (GBM), and was the first firm detection of a GRB by the Fermi Large Area Telescope (LAT). We discuss the LAT event selections, background estimation, significance calculations, and localization for Fermi GRBs in general and GRB 080825C in particular. We show the results of temporal and time-resolved spectral analysis of the GBM and LAT data. We also present some theoretical interpretation of GRB 080825C observations as well as some common features observed in other LAT GRBs.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/cd660b0d17e0ebe60642a8f1378c406e60ab275f

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Citations in the corpus

GeV emission from gamma‐ray bursts: a radiative fireball? (2009, background): “One of the argument put forward against the afterglow interpretation of the high energy flux is its variability, that according to Abdo et al. (2009c) can have a timescales∆tvar as short as 90 ms.”
Collisional mechanism for gamma‐ray burst emission (2009, background): “…baryonic jet with comparable numbers of neutrons and protons (our model would not work for jets that are completely dominated by magnetic field, large radiusr ≫ R⋆ (e.g. Racusin et al. 2008; Abdo et al. 2009a) are based on incorrect assumptions (see Section 6.1). with negligible baryonic loading).”
Quantum-Spacetime Phenomenology (2008, methodology): “There are, so far, four Fermi-detected gamma-ray bursts that are particularly significant for the hypothesis of in-vacuo dispersion: GRB 090816C [3], GRB 090510 [4], GRB 090902B [2], GRB 090926A [482].”
Reconciling observed gamma-ray burst prompt spectra with synchrotron radiation? (2010, methodology): “Observations of prompt GRBs by the LAT instrument on board Fermi indicate that most GRBs do not show an additional component at high energy (> 100 MeV) brighter or as bright as in the soft gamma-ray range (Abdo et al. 2009; Omodei et al. 2009).”
Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S (2014, background): “For some GRBs (e.g. GRB 080916C, Abdo et al. 2009b) the emission is consistent with a Band function from keV to GeV energies, whereas other bursts show an additional hard power-law component at HE (e.g. GRB 090902B & 090510, Abdo et al. 2009a; Ackermann et al. 2010), which in some cases exhibits a…”
The Proto-Magnetar Model for Gamma-Ray Bursts (2010, background): “Evidence has recently grown for a class of ‘Very Luminous GRBs’ (VLGRBs; e.g. Cenko et al. 2010b,a), which includes several Fermi bursts such as GRB 080916C with an isotropic energy Eγ,iso ≈ 8 × 10 54 ergs (e.g. Abdo et al. 2009).”
On the generation of high-energy photons detected by the Fermi Satellite from gamma-ray bursts (2009, methodology): “…the spectrum from 8 keV to 13 GeV had the shape of a Band function (two power-law components smoothly joined) it has been suggested that the observed radiation over the entire 6-decades interval in frequency was produced by the same source (Abdo et al. 2009, Wang et al. 2009, Zhang & Pe’er 2009).”
FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG (2010, methodology): “7−7037 which is also associated with PKS 0601−70, a blazar that was significantly variable during the time span of the 1FGL catalog (Abdo et al. 2009f).”
GeV gamma-ray attenuation and the high-redshift UV background (2009, background): “The 3-month Fermi LAT survey has already reported 106 AGN sources at high confidence (Abdo et al. 2009).”
A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB Catalog (2019, methodology): “Indeed, these considerations have been used to estimate a Lorentz factor well above 500 in several LAT-detected bursts (see, e.g., Abdo et al. 2009d,b).”