Journal
ASTROPHYSICAL JOURNAL
Volume 846, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa81c2
Keywords
acceleration of particles; gamma-ray burst: individual (GRB 120323A); radiation mechanisms: non-thermal; radiation mechanisms: thermal
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Funding
- NASA Postdoctoral Program (NPP) at the NASA/Goddard Space Flight Center
- NASA
- Cycles-5,7 and 9 NASA Fermi Guest Investigator program (NNH11ZDA001N) [51279, 71377, 91264]
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GRB 120323A. is a very intense short gamma -ray burst (GRB) detected simultaneously during its prompt gamma-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 gamma-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.
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