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Title: PROBING CURVATURE EFFECTS IN THE FERMI GRB 110920

Curvature effects in gamma-ray bursts (GRBs) have long been a source of considerable interest. In a collimated relativistic GRB jet, photons that are off-axis relative to the observer arrive at later times than on-axis photons and are also expected to be spectrally softer. In this work, we invoke a relatively simple kinematic two-shell collision model for a uniform jet profile and compare its predictions to GRB prompt-emission data for observations that have been attributed to curvature effects such as the peak-flux-peak-frequency relation, i.e., the relation between the νF{sub ν} flux and the spectral peak, E{sub pk} in the decay phase of a GRB pulse, and spectral lags. In addition, we explore the behavior of pulse widths with energy. We present the case of the single-pulse Fermi GRB 110920 as a test for the predictions of the model against observations.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, The George Washington University, Washington, DC 20052 (United States)
  2. Department of Physics, University of Adiyaman, 02040 Adiyaman (Turkey)
  3. Space Science Division, Code 7653, Naval Research Laboratory, Washington, DC 20375 (United States)
  4. CSPAR, University of Alabama in Huntsville, Huntsville, AL 35805 (United States)
  5. Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States)
  6. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
Publication Date:
OSTI Identifier:
22270536
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COSMIC GAMMA BURSTS; COSMIC PHOTONS; GAMMA ASTRONOMY; JETS; RELATIVISTIC RANGE