Home > Publications database > Temporal and Spectral Evolution of Gamma-Ray Burst Broad Pulses: Identification of High-latitude Emission in the Prompt Emission > print

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024 7 _ |a 10.3847/1538-4357/acc581
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024 7 _ |a 1538-4357
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024 7 _ |a arXiv:2212.07095
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088 _ _ |a arXiv:2212.07095
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100 1 _ |a Tak, Donggeun
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245 _ _ |a Temporal and Spectral Evolution of Gamma-Ray Burst Broad Pulses: Identification of High-latitude Emission in the Prompt Emission
260 _ _ |a London
|c 2023
|b Institute of Physics Publ.
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500 _ _ |a 30 pages, 36 figures, accepted to ApJ
520 _ _ |a We perform a detailed analysis of broad pulses in bright gamma-ray bursts (GRBs) to understand the evolution of GRB broad pulses. Using the temporal and spectral properties, we test the high-latitude emission (HLE) scenario in the decaying phase of broad pulses. The HLE originates from the curvature effect of a relativistic spherical jet, where higher-latitude photons are delayed and softer than the observer's line-of-sight emission. The signature of HLE has not yet been identified undisputedly during the prompt emission of GRBs. The HLE theory predicts a specific relation, $F_v$,${_E}_p$∝$E^{2}_{p}$, between the peak energy $E_p$ in $νF_ν$ spectra and the spectral flux $F_ν$ measured at $E_p$. . We search for evidence of this relation in 2157 GRBs detected by the Gamma-ray Burst Monitor on board the Fermi Gamma-ray Space Telescope from 2008 to 2017. After imposing unbiased selection criteria in order to minimize contamination in a signal by background and overlaps of pulses, we build a sample of 32 broad pulses in 32 GRBs. We perform a time-resolved spectral analysis on each of these 32 broad pulses and find that the evolution of 18 pulses (56%) is clearly consistent with the HLE relation. For the 18 broad pulses, the exponent δ in the relation of $F_v$,${_E}_p$∝$E^{\delta}_{p}$ is distributed as a Gaussian function with a median and width of 1.99 and 0.34, respectively. This result provides a constraint on the emission radius of GRBs with the HLE signature.
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700 1 _ |a Uhm, Z. Lucas
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700 1 _ |a Racusin, Judith
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700 1 _ |a Zhang, Bing
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700 1 _ |a Guiriec, Sylvain
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700 1 _ |a Kocevski, Daniel
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700 1 _ |a Zhang, Bin-Bin
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700 1 _ |a McEnery, Julie
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773 _ _ |a 10.3847/1538-4357/acc581
|g Vol. 949, no. 2, p. 110 -
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|t The astrophysical journal / Part 1
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|y 2023
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856 4 _ |y OpenAccess
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