Abstract
A model of the old and hot neutron stars (age , temperature ) with the low magnetic field as the sources of Gamma-ray bursts is presented. In the range of medium energy , the main radiation mechanism is still the thermal synchrotron radiation. The absorption features of the low frequency are resulted from the superposition of the blackbody spectrum emitted by the hot neutron star itself and the thermal synchrotron spectrum with self–absorption. And the spectrum for the high energy part (, including the emission features) is due to the annihilation emission from the unthermalized positrons and electrons. Using this model, we adopt the three component spectra to fit four representative spectra of Gamma–ray bursts. The results are satisfactory. Our model also avoids some difficulties existed in other models.
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