2021ApJ...922..255T

Query : 2021ApJ...922..255T

2021ApJ...922..255T - Astrophys. J., 922, 255-255 (2021/December-1)

Prevalence of extra power-law spectral components in short gamma-ray bursts.

TANG Q.-W., WANG K., LI L. and LIU R.-Y.

Abstract (from CDS):

A prompt extra power-law (PL) spectral component that usually dominates the spectral energy distribution below tens of keV or above ∼10 MeV has been discovered in some bright gamma-ray bursts (GRBs). However, its origin is still unclear. In this paper, we present a systematic analysis of 13 Fermi short GRBs, as of 2020 August, with contemporaneous keV-MeV and GeV detections during the prompt emission phase. We find that the extra PL component is a ubiquitous spectral feature for short GRBs, showing up in all 13 analyzed GRBs. The PL indices are mostly harder than -2.0, which may be well reproduced by considering the electromagnetic cascade induced by ultrarelativistic protons or electrons accelerated in the prompt emission phase. The average flux of these extra PL components positively correlates with that of the main spectral components, which implies they may share the same physical origin.

Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray bursts - High energy astrophysics - Astronomy data analysis

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Fermi bn090227772 gB 00 47 +32.2           ~ 53 0
2 Fermi bn081221681 gB 01 03 10.2 -24 32 53           ~ 186 0
3 Fermi bn120830297 gB 05 54 36.0 -28 59 04           ~ 22 0
4 Fermi bn180703949 gB 06 28 -29.9           ~ 18 0
5 GRB 190515A gB 06 35 23.73 +52 19 00.4           ~ 14 0
6 GRB 090228 gB 07 07.2 -24 18           ~ 45 0
7 GRB 110529A gB 07 53.3 +67 55           ~ 27 0
8 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 386 0
9 Fermi bn110728056 gB 11 06 +20.1           ~ 12 0
10 GRB 171011C gB 11 13.9 +10 02           ~ 2 0
11 GRB 141113A gB 12 09.3 +77 23           ~ 3 0
12 Fermi bn100414097 gB 12 48 30.0 +08 41 35           ~ 136 0
13 GRB 160829A gB 13 26.8 -56 46           ~ 9 0
14 Fermi bn140402007 gB 13 50 23.67 +05 46 28.0           ~ 41 0
15 Fermi bn120915000 gB 13 58 +67.3           ~ 8 0
16 Fermi bn110920338 gB 13 59 -27.6           ~ 28 0
17 GRB 081102B gB 15 01.2 +22 00           ~ 25 0
18 Fermi bn160709826 gB 15 43 59 -28 11.3           ~ 20 0
19 GRB 090531B gB 16 48 15.0 -36 01 27           ~ 58 0
20 Fermi bn090902462 gB 17 39 45.26 +27 19 28.1           ~ 440 0
21 Fermi bn110731465 gB 18 42 00.99 -28 32 13.8           ~ 193 0
22 Fermi bn090902401 gB 19 24 +53.1           ~ 22 0
23 Fermi bn160107931 gB 19 58 40.8 +06 24 47           ~ 12 0
24 Fermi bn081024891 gB 21 31 36.00 +21 12 14.4           ~ 91 0
25 Fermi bn090510016 G 22 14 12.6230 -26 34 58.550           ~ 548 0
26 GRB 170127C gB 22 37 -63.9           ~ 39 0
27 GRB 160702A gB ~ ~           ~ 7 0

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