Abstract
GRB100724B was observed by the Gamma-Ray Burst Monitor (GBM) of the Fermi Gamma-Ray Space Telescope. The time-integrated prompt emission spectra of this burst can be best modeled with a combination of non-thermal component (Band) and thermal component (Blackbody). In this paper we compare the fitting results of the two different models (Band Only and Band+Blackbody) in the time-resolved spectra, which implies that (i) the thermal component significantly decrease the low-energy index $\alpha$ and does not seem to affect high-energy index $\beta$ ; the peak energy of $\nu F_{\nu}$ spectra $E_{p}$ increases when BB is added to Band and it leads to faster decay of $E_{p}$ in decaying episodes. (ii) The traditional synchrotron radiation can not get a better interpretation through the analysis of low-energy index. (iii) This burst can be a good sample of the GRB with hybrid jets, with a thermal component and a cold Poynting flux.
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