Multi-color blackbody emission in GRB 081221
Shu-Jin Hou, Bin-Bin Zhang, Yan-Zhi Meng, Xue-Feng Wu, En-Wei Liang,, Hou-Jun L\"u, Tong Liu, Yun-Feng Liang, Lin Lin, Rui-jing Lu, Jin-Shu Huang,, and Bing Zhang

TL;DR
This paper proposes a multi-color blackbody model to explain the prompt emission spectrum of GRB 081221, suggesting it is dominated by photospheric emission and that empirical Band spectra can be interpreted as superpositions of blackbody components.
Contribution
The study introduces a multi-color blackbody model with a power-law luminosity distribution to fit GRB spectra, providing a new interpretation of the prompt emission mechanism.
Findings
The time-integrated spectrum fits well with the mBB model.
Time-resolved spectra are consistent with single-temperature blackbodies.
Results support photospheric emission dominance in GRB 081221.
Abstract
The radiation mechanism of the prompt emission of gamma-ray bursts (GRBs) remains an open question. Although their spectra are usually well fitted with the empirical Band function, which is widely believed to be fully non-thermal and interpreted as an optically thin synchrotron emission, accumulating evidence shows that a thermal component actually exists. In this paper, a multi-color blackbody (mBB) model is proposed for the time-integrated spectrum of GRB 081221 by assuming a power-law distribution of the thermal luminosities with temperature, which manifests photospheric emissions from a different radius and/or angle. The effects of the minimum temperature , the maximum temperature and the power law index of the luminosity distribution of an mBB are discussed. The fitting to the time-integrated spectrum during the bright phase (from 20s to 30s since the…
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