J/A+A/557/A100 Fermi and Swift GRBs Epeak-Eiso relation (Heussaff+, 2013)
The Epeak - Eiso relation revisited with Fermi GRBs.
Resolving a long-standing debate ?
Heussaff V., Atteia J.-L., Zolnierowski Y.
<Astron. Astrophys., 557, A100-100 (2013)>
=2013A&A...557A.100H 2013A&A...557A.100H
ADC_Keywords: Gamma rays ; Redshifts ; Spectroscopy
Keywords: gamma-ray burst: general - cosmology: miscellaneous
Abstract:
We used a sample of gamma-ray bursts (GRBs) detected by Fermi and
Swift to reanalyze the correlation discovered by Amati et al.
(2002A&A...390...81A 2002A&A...390...81A) between Epi, the peak energy of the prompt GRB
emission, and Eiso, the energy released by the GRB assuming
isotropic emission. This correlation has been disputed by various
authors, and our aim is to assess whether it is an intrinsic GRB
property or the consequence of selection effects.
We constructed a sample of Fermi GRBs with homogeneous selection
criteria, and we studied their distribution in the Epi-Eiso plane.
Our sample is made of 43 GRBs with a redshift and 243 GRBs without a
redshift. We show that GRBs with a redshift follow a broad
Epi-Eiso relation, while GRBs without a redshift show several
outliers. We use these samples to discuss the impact of selection
effects associated with GRB detection and with redshift measurement.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 68 43 43 GRBs with a redshift
tablea2.dat 68 243 243 GRBs without a redshift
refs.dat 194 77 References
--------------------------------------------------------------------------------
See also:
J/A+A/525/A53 : GBM parameters for detected FERMI bursts (Guetta+, 2011)
J/A+A/530/A21 : Spectral properties of 438 GRBs (Nava+, 2011)
J/ApJS/199/18 : The Fermi GBM catalog (Paciesas+, 2012)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GRB]
5- 13 I9 --- GRB GRB name
14 A1 --- n_GRB [*ob] Note on GRB (1)
16- 19 F4.2 --- z ? Redshift (only for sources in tablea1)
20- 21 A2 --- r_z Reference for redshift, in refs.dat file
23- 27 F5.2 --- alpha Photon spectral index α of the low
energy power law (α>-2)
29- 32 F4.2 --- e_alpha rms uncertainty on alpha
(confidence level of 90%)
34- 38 F5.2 --- beta Photon spectral index β of the high
energy power law (β←2)
40- 43 F4.2 --- e_beta ? rms uncertainty on beta
(confidence level of 90%)
45- 48 I4 keV Epo Peak energy Epo of the νFν spectrum
in the observer's frame
49- 50 A2 --- r_Epo Reference for Ep, in refs.dat file
52- 55 I4 keV e_Epo rms uncertainty on Ep
(confidence level of 90%)
57- 63 F7.1 10-10J/m2 Fluence Fluence (in 10-7erg/cm2)
65- 68 F4.1 10-10J/m2 e_Fluence rms uncertainty on Fluence
--------------------------------------------------------------------------------
Note (1): Note as follows:
* = 9 GRBs (with GRB 090328401 flagged o) in tablea1 have been localized by
LAT, IPN or INTEGRAL, they are at the bright end of the GRB luminosity
function.
o = source localized by LAT, IPN or INTEGRAL, outlier to the Amati relation
b = for the 29 GRBs that are outliers to the Amati relation in tablea2
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 47 A24 --- Aut Author's name
49-194 A146 --- Com Additional references
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Jan-2014