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GRB 120323A is a very intense short Gamma Ray Burst (GRB) detectedsimultaneously during its prompt gamma-ray emission phase with the Gamma-rayBurst Monitor (GBM) on board the Fermi Gamma-ray Space Telescope and the Konusexperiment on board the Wind satellite. GBM and Konus operate in the keV--MeVregime, however, the GBM range is broader both toward the low and the highparts of the gamma-ray spectrum. Analysis of such bright events provide aunique opportunity to check the consistency of the data analysis as well ascross-calibrate the two instruments. We performed time-integrated and coarsetime-resolved spectral analysis of GRB 120323A prompt emission. We concludethat the analyses of GBM and Konus data are only consistent when using adouble-hump spectral shape for both data sets; in contrast, the single-hump ofthe empirical Band function, traditionally used to fit GRB prompt emissionspectra, leads to significant discrepancies between GBM and Konus analysisresults. Our two-hump model is a combination of a thermal-like and anon-thermal component. We interpret the first component as a naturalmanifestation of the jet photospheric emission.

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