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Prompt Ultraviolet-to-Soft-X-Ray Emission of Gamma-Ray Bursts: Application to GRB 031203? | | Zhuo Li
; Li-Ming Song
; | | Date: |
7 Mar 2004 | | Journal: | Astrophys.J. 608 (2004) L17-L21 | | Subject: | astro-ph | | Abstract: | We discuss the prompt emission of GRBs, allowing for $gammagamma$ pair production and synchrotron self-absorption. The observed hard spectra suggest heavy pair-loading in GRBs. The re-emission of the generated pairs results in the energy transmission from high-energy gamma-rays to long-wavelength radiation. Due to strong self-absorption, the synchrotron radiation by pairs is in optically thick regime, showing a thermal-like spectral bump in the extreme-ultraviolet/soft X-ray band, other than the peak from the main burst. Recently, the prompt soft X-ray emission of GRB 031203 was detected thanks to the discovery of a delayed dust echo, and it seems to be consistent with the model prediction of a double-peak structure. The confirmation of the thermal-like feature and the double-peak structure by observation would indicate that the dominant radiation mechanism in GRBs is synchrotron rather than inverse-Compton radiation. | | Source: | arXiv, astro-ph/0403168 | | Services: | Forum | Review | PDF | Favorites | |
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