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Title: Photospheric Emission in the Joint GBM and Konus Prompt Spectra of GRB 120323A

Abstract

GRB 120323A is a very intense short gamma -ray burst (GRB) detected simultaneously during its prompt γ -ray emission phase with the Gamma-ray Burst Monitor (GBM) on board the Fermi Gamma-ray Space Telescope and the Konus experiment on board the Wind satellite. GBM and Konus operate in the keV–MeV regime; however, the GBM range is broader toward both the low and the high parts of the γ -ray spectrum. Analyses of such bright events provide a unique opportunity to check the consistency of the data analysis as well as cross-calibrate the two instruments. We performed time-integrated and coarse time-resolved spectral analysis of GRB 120323A prompt emission. We conclude that the analyses of GBM and Konus data are only consistent when using a double-hump spectral shape for both data sets; in contrast, the single hump of the empirical Band function, traditionally used to fit GRB prompt emission spectra, leads to significant discrepancies between GBM and Konus analysis results. Our two-hump model is a combination of a thermal-like and a non-thermal component. We interpret the first component as a natural manifestation of the jet photospheric emission.

Authors:
;  [1]; ;  [2];  [3]
  1. Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052 (United States)
  2. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  3. Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics (United States)
Publication Date:
OSTI Identifier:
22679864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; COSMIC GAMMA BURSTS; DATA ANALYSIS; EMISSION; EMISSION SPECTRA; GAMMA RADIATION; GAMMA SPECTRA; KEV RANGE; MEV RANGE; SATELLITES; SPACE; STELLAR WINDS; TELESCOPES; TIME RESOLUTION

Citation Formats

Guiriec, S., Kouveliotou, C., Gehrels, N., McEnery, J., and Hartmann, D. H., E-mail: sylvain.guiriec@nasa.gov. Photospheric Emission in the Joint GBM and Konus Prompt Spectra of GRB 120323A. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA81C2.
Guiriec, S., Kouveliotou, C., Gehrels, N., McEnery, J., & Hartmann, D. H., E-mail: sylvain.guiriec@nasa.gov. Photospheric Emission in the Joint GBM and Konus Prompt Spectra of GRB 120323A. United States. doi:10.3847/1538-4357/AA81C2.
Guiriec, S., Kouveliotou, C., Gehrels, N., McEnery, J., and Hartmann, D. H., E-mail: sylvain.guiriec@nasa.gov. Sun . "Photospheric Emission in the Joint GBM and Konus Prompt Spectra of GRB 120323A". United States. doi:10.3847/1538-4357/AA81C2.
@article{osti_22679864,
title = {Photospheric Emission in the Joint GBM and Konus Prompt Spectra of GRB 120323A},
author = {Guiriec, S. and Kouveliotou, C. and Gehrels, N. and McEnery, J. and Hartmann, D. H., E-mail: sylvain.guiriec@nasa.gov},
abstractNote = {GRB 120323A is a very intense short gamma -ray burst (GRB) detected simultaneously during its prompt γ -ray emission phase with the Gamma-ray Burst Monitor (GBM) on board the Fermi Gamma-ray Space Telescope and the Konus experiment on board the Wind satellite. GBM and Konus operate in the keV–MeV regime; however, the GBM range is broader toward both the low and the high parts of the γ -ray spectrum. Analyses of such bright events provide a unique opportunity to check the consistency of the data analysis as well as cross-calibrate the two instruments. We performed time-integrated and coarse time-resolved spectral analysis of GRB 120323A prompt emission. We conclude that the analyses of GBM and Konus data are only consistent when using a double-hump spectral shape for both data sets; in contrast, the single hump of the empirical Band function, traditionally used to fit GRB prompt emission spectra, leads to significant discrepancies between GBM and Konus analysis results. Our two-hump model is a combination of a thermal-like and a non-thermal component. We interpret the first component as a natural manifestation of the jet photospheric emission.},
doi = {10.3847/1538-4357/AA81C2},
journal = {Astrophysical Journal},
number = 2,
volume = 846,
place = {United States},
year = {Sun Sep 10 00:00:00 EDT 2017},
month = {Sun Sep 10 00:00:00 EDT 2017}
}