J/ApJ/818/18 Jet angles and gamma-ray energetics estimations (Goldstein+, 2016)
Estimating long GRB jet opening angles and rest-frame energetics.
Goldstein A., Connaughton V., Briggs M.S., Burns E.
<Astrophys. J., 818, 18 (2016)>
=2016ApJ...818...18G 2016ApJ...818...18G (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays ; Models
Keywords: gamma-ray burst: general
Abstract:
We present a method to estimate the jet opening angles of long
duration gamma-ray bursts (GRBs) using the prompt gamma-ray energetics
and an inversion of the Ghirlanda relation, which is a correlation
between the time-integrated peak energy of the GRB prompt spectrum and
the collimation-corrected energy in gamma-rays. The derived jet
opening angles using this method and detailed assumptions match well
with the corresponding inferred jet opening angles obtained when a
break in the afterglow is observed. Furthermore, using a model of the
predicted long GRB redshift probability distribution observable by the
Fermi Gamma-ray Burst Monitor (GBM), we estimate the probability
distributions for the jet opening angle and rest-frame energetics for
a large sample of GBM GRBs for which the redshifts have not been
observed. Previous studies have only used a handful of GRBs to
estimate these properties due to the paucity of observed afterglow jet
breaks, spectroscopic redshifts, and comprehensive prompt gamma-ray
observations, and we potentially expand the number of GRBs that can be
used in this analysis by more than an order of magnitude. In this
analysis, we also present an inferred distribution of jet breaks which
indicates that a large fraction of jet breaks are not observable with
current instrumentation and observing strategies. We present simple
parameterizations for the jet angle, energetics, and jet break
distributions so that they may be used in future studies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 95 638 Jet angle and energetics probability density
functions (PDFs)
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See also:
J/A+A/588/A135 : Fermi/GBM GRB time-resolved spectral catalog (Yu+, 2016)
J/A+A/573/A81 : Spectral properties of energetic GRBs (Yu+, 2015)
J/ApJ/811/93 : Fermi/GBM GRB minimum timescales (Golkhou+, 2015)
J/ApJS/218/11 : The 5yr Fermi/GBM magnetar burst catalog (Collazzi+, 2015)
J/ApJS/216/32 : Localizations of GRBs with Fermi GBM (Connaughton+, 2015)
J/ApJS/211/13 : The second Fermi/GBM GRB catalog (4yr) (von Kienlin+, 2014)
J/ApJS/208/21 : The BATSE 5B GRB spectral catalog (Goldstein+, 2013)
J/ApJS/207/39 : IPN supplement to the Fermi GBM (Hurley+, 2013)
J/ApJ/774/114 : GRB 081007 and GRB 090424 light curves (Jin+, 2013)
J/ApJ/763/15 : Fermi GRB analysis. III. T90 distributions (Qin+, 2013)
J/ApJ/754/121 : GRBs from Fermi/GBM and LAT (The Fermi Team, 2012)
J/ApJS/199/18 : The Fermi GBM catalog (Paciesas+, 2012)
J/A+A/535/A57 : g'r'i'z'JH light curves of GRB 091127 (Filgas+, 2011)
J/ApJ/672/449 : GRB 061126 light curves (Perley+, 2008)
J/ApJ/609/935 : Gamma-ray burst formation rate (Yonetoku+, 2004)
http://www.mpe.mpg.de/~jcg/grbgen.html : GRBs list
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 I09 --- bn [080714086/120711115] GBM burst number
11- 15 F5.2 [deg] theta [-0.2/1.5] Log-normal mean opening angle
17- 20 F4.2 [deg] e_theta [0.08/0.3] Standard deviation in theta
22- 26 F5.2 [10-7J] Eiso [51.7/55.2] Log-normal mean isotropic energy (1)
28- 31 F4.2 [10-7J] e_Eiso [0.4/0.8] Standard deviation in Eiso (1)
33- 37 F5.2 [10-7J] Egam [49.4/53] Log-normal mean collimation-corrected
energy (1)
39- 42 F4.2 [10-7J] e_Egam [0.3/0.6] Standard deviation in Egam (1)
44- 48 F5.2 [10-7W] Liso [0/54.8] Log-normal mean isotropic luminosity (2)
50- 53 F4.2 [10-7W] e_Liso [0/1] Standard deviation in Liso (2)
55- 59 F5.2 [10-7W] Lgam [0/53.2] Log-normal mean collimation-corrected
luminosity (2)
61- 64 F4.2 [10-7W] e_Lgam [0/0.8] Standard deviation in Lgma (2)
66- 69 F4.2 [keV] Epzf [1.9/4.1] Log-normal mean time-integrated
peak energy
71- 74 F4.2 [keV] e_Epzf [0.1/0.3] Standard deviation in Epzf
76- 79 F4.2 [keV] Epzp [0/4.5] Log-normal mean peak energy
81- 84 F4.2 [keV] e_Epzp [0/0.3] Standard deviation in Epzp
86- 90 F5.2 [d] Tjet [-1.5/3.8] Log-normal mean jet break time
92- 95 F4.2 [d] e_Tjet [0.3/0.8] Standard deviation in Tjet
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Note (1): In units of erg.
Note (2): In units of erg/s.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Apr-2016