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Galaxies 2018, 6(4), 106; https://doi.org/10.3390/galaxies6040106

Investigation of Similarity in the Spectra between Short- and Long-Duration Gamma-ray Bursts

Department of Physics andMathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5258, Japan
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Received: 8 August 2018 / Revised: 25 September 2018 / Accepted: 26 September 2018 / Published: 3 October 2018
PDF [458 KB, uploaded 3 October 2018]

Abstract

We investigated the spectral properties of the prompt emission for short- and long-duration gamma-ray bursts (GRBs) using the Fermi Gamma-ray Burst Monitor data. In particular, we focused on comparing the spectral properties of short GRBs and the initial 2 s of long GRBs, motivated by the previous study of Ghirlanda et al. (2009). We confirmed the similarity in the low energy photon index α between short GRBs and the initial 2 s of long GRBs. Since about a quarter of our spectra of both short GRBs and the initial 2 s of long GRBs show α to be shallower than - 2 / 3 , it is difficult to understand in the context standard synchrotron emission.
Keywords: gamma-ray burst; prompt emission; spectrum gamma-ray burst; prompt emission; spectrum
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Sakamoto, T.; Yoshida, Y.; Serino, M. Investigation of Similarity in the Spectra between Short- and Long-Duration Gamma-ray Bursts. Galaxies 2018, 6, 106.

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