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J/PAZh/35/10     Gamma-ray bursts with known redshifts           (Badjin+, 2009)
Investigation of gamma-ray bursts with known redshifts:
Statistical analysis of parameters.
    Badjin D.A., Beskin G.M., Greco G.
   <Pis'ma Astron. Zh. 35, 10 (2009)>
   =2009PAZh...35...10B
   =2009AstL...35....7B
ADC_Keywords: Gamma rays

Keywords: gamma-ray bursts - afterglows


Abstract:
    Observational parameters of the optical and gamma-ray emissions from
    58 gamma-ray bursts (GRBs) with discovered afterglows and known
    redshifts are analyzed. The distributions of these parameters and pair
    correlations between them are studied. Approximately half of the
    objects exhibit a relatively slow decrease in the optical flux at
    initial afterglow phases (with a power-law index in the decay law
    α<1). Correlations have been found between the luminosities,
    energies, and durations of the optical and gamma-ray emissions, which
    can be explained by the presence of universal features in the light
    curves. A correlation of the peak luminosity for afterglows with the
    redshift and an anticorrelation of their durations with the redshift
    have been found for the first time. Against the background of a weak z
    dependence of the total afterglow energy, this effect can be explained
    by cosmological evolution of the GRB environment, which determines the
    rate of optical energy release.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        92       58   Parameters of the "observed" sample
table2.dat        87       58   Parameter of the "intrinsic" sample


See also:
          IX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)
          IX/36 : GRANAT/PHEBUS catalog of cosmic GRB (Terekhov+, 1994-2002)
 J/A+AS/129/1   : GRANAT/WATCH catalogue of gamma-ray bursts (Sazonov+ 1998)
 J/ApJS/126/19  : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)
 J/ApJS/134/385 : Supplement to the BATSE GRB catalogs (Kommers+, 2001)
 J/ApJ/616/1072 : The GUSBAD catalog of gamma-ray bursts (Schmidt+, 2004)
 J/A+A/438/1175 : First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue (Rau+, 2005)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units     Label      Explanations

   1-  7  A7    ---       GRB        GRB name
   8- 11  I4    ---       Npt        Number of points
  13- 18  F6.4  ---       z          Redshift
  20- 25  F6.2  [mW/m2]   logFopt    Peak optical flux from R band
  27- 30  F4.2  [mW/m2]   e_logFopt  rms uncertainty on logFopt
  32- 37  F6.2  [mJ/m2]   logSopt    Optical fluence [erg/cm2]
  39- 42  F4.2  [mJ/m2]   e_logSopt  rms uncertainty on logSopt
  44- 48  F5.2  [d]       logt90opt  Afterglow duration in the proper
                                      frame T90opt
  50- 55  F6.3  [d]       logtpk     Afterglow duration in the proper frame Tpk
  57- 61  F5.2  [mW/m2]   logFg      ?=- Peak gamma-ray flux
  63- 66  F4.2  [mW/m2]   e_logFg    ? rms uncertainty on logFg
  68- 72  F5.2  [mJ/m2]   logSg      ?=- Gamma-ray fluence [erg/cm2]
  74- 77  F4.2  [mJ/m2]   e_logSg    ? rms uncertainty on logSg
  79- 82  F4.2  [s]       logtg      ? Afterglow duration in the proper frame Tg
  84- 87  F4.2  ---       alpha1     Power-law index of the flux decay
                                      with time (F∝t^-α)
  89- 92  F4.2  ---       e_alpha1   rms uncertainty on alpha


Byte-by-byte Description of file: table2.dat

   Bytes Format Units     Label     Explanations

   1-  7  A7    ---       GRB       GRB name
   9- 14  F6.4  ---       z         Redshift
  16- 20  F5.2  [10-7W]   logLopt   Isotropic equivalent of the peak optical
                                     luminosity
  22- 25  F4.2  [10-7W]  e_logLopt  rms uncertainty on logLopt
  27- 31  F5.2  [10-7J]   logEopt   Isotropic equivalent of the total optical
                                     energy
  33- 36  F4.2  [10-7J]  e_logEopt  rms uncertainty on logEopt
  38- 42  F5.2  [d]      logT90opt  Afterglow duration ( =t90opt/(1+z))
  44- 49  F6.3  [d]       logTpk    Afterglow duration ( =tpk/(1+z))
  51- 55  F5.2  [10-7W]   logLiso   ?=- Isotropic equivalent of the peak
                                        gamma-ray luminosity in the energy
                                        range 15-150keV
  57- 60  F4.2  [10-7W]  e_logLiso  ? rms uncertainty on logLiso
  62- 66  F5.2  [10-7J]   logEiso   ?=- Isotropic equivalent of the total
                                        gamma-ray energy (the energy range
                                        15-150keV in the proper burst frame)
  68- 71  F4.2  [10-7J]  e_logEiso  ? rms uncertainty on logEiso
  73- 77  F5.2  [s]       logTg     ? Afterglow duration ( =tg/(1+z))
  79- 82  F4.2  ---       alpha2    Power-law index of the flux decay
                                     with time (F∝t^-α)
  84- 87  F4.2  ---       e_alpha2  rms uncertainty on alpha


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    12-Jan-2009