2021ApJS..253...43L

Query : 2021ApJS..253...43L

2021ApJS..253...43L - Astrophys. J., Suppl. Ser., 253, 43-43 (2021/April-0)

Testing the high-latitude curvature effect of gamma-ray bursts with Fermi data: evidence of bulk acceleration in prompt emission.

LI L. and ZHANG B.

Abstract (from CDS):

When a gamma-ray burst (GRB) emitter stops emission abruptly, the observer receives rapidly fading emission from high latitudes with respect to the line of sight, known as the "curvature effect." Identifying such emission from GRB prompt-emission lightcurves would constrain the radius of prompt emission from the central engine and the composition of GRB jets. We perform a dedicated search of high-latitude emission (HLE) through spectral and temporal analyses of a sample of single-pulse bursts detected by the Gamma-ray Burst Monitor on board the Fermi satellite. We identify HLE from a subsample of bursts and constrain the emission radius to be RGRB ∼ (1015-1016) cm from the central engine. Some bursts have the HLE decay faster than predicted by a constant Lorentz factor jet, suggesting that the emission region is undergoing acceleration during prompt emission. This supports the Poynting-flux-dominated jet composition for these bursts. The conclusion is consistent with previous results drawn from spectral-lag modeling of prompt emission and HLE analysis of X-ray flares.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-ray bursts - Relativistic jets - Astronomy data analysis

Simbad objects: 24

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Number of rows : 24
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 bn131231198 gB 00 42 44.0 -01 29 40           ~ 103 0
2 Fermi bn170114917 gB 00 48 -12.6           ~ 36 0
3 GRB 150510A gB 01 05 +04.8           ~ 23 0
4 GRB 180305A gB 03 18 48.0 +32 06 00           ~ 22 0
5 GRB 150213A gB 06 21 -04.8           ~ 15 0
6 GRB 151021B gB 06 57 -11.0           ~ 9 0
7 Fermi bn120426090 gB 07 26 -65.6           ~ 17 0
8 Fermi bn130305486 gB 07 46 59.45 +52 02 00.2           ~ 35 0
9 Fermi bn150314205 gB 08 26 40.82 +63 50 03.4           ~ 117 0
10 Fermi bn160216801 gB 08 37 48.0 +13 42 00           ~ 2 0
11 Fermi bn090804940 gB 08 42 -11.3           ~ 21 0
12 Fermi bn170921168 gB 08 49 30.0 +57 03 25           ~ 9 0
13 GRB 160530B gB 08 54 +43.5           ~ 14 0
14 GRB 081224A gB 13 26.8 +75 06           ~ 32 0
15 Fermi bn110920338 gB 13 59 -27.6           ~ 28 0
16 Fermi bn150902733 gB 14 19 54.18 -69 21 09.9           ~ 30 0
17 GRB 090620 gB 15 49.4 +61 09           ~ 29 0
18 GRB 141028A gB 21 30 24.46 -00 13 55.6           ~ 109 0
19 Fermi bn130614997 gB 21 37 -33.9           ~ 10 0
20 GRB 110721A gB 22 10 -38.6           ~ 155 0
21 Fermi bn171210493 gB 22 21 09.6 +24 26 24           ~ 20 0
22 Fermi bn120323507 gB 22 42 +29.7           ~ 60 0
23 GRB 090719 gB 22 45 -67.9           ~ 41 0
24 Fermi bn100707032 gB 23 24 -06.6           ~ 44 0

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