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.
Highlights
The origin of short-duration gamma-ray bursts is receiving great attention in the field of astrophysics
We report the comparison of the spectral properties of a prompt emission between short and long gamma-ray bursts (GRBs) by Fermi Gamma-ray Burst Monitor (GBM) data
The distribution of α for long GRBs tends to overlap at a steeper region of short GRBs, whereas Epeak distributes to a higher energy for short GRBs compared to that of long GRBs
Summary
The origin of short-duration gamma-ray bursts (hereafter short GRBs) is receiving great attention in the field of astrophysics. Ghirlanda et al [10] show that the hardness of short GRBs is driven by a shallower (harder) low energy photon index α compared to that of long GRBs rather than the peak energy in the νFν spectrum Epeak by the Compton Gamma-ray Observatory Burst And Transient Source Experiment (BATSE). According to Ghirlanda et al [13], Epeak of time-resolved spectra of both long and short GRBs shows a positive correlation to the peak fluxes (or luminosity) Those previous works shed light on the similarity in the radiation process between long and short GRBs despite the different progenitors. We report the comparison of the spectral properties of a prompt emission between short and long GRBs by Fermi GBM data.
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