J/ApJ/740/104 BATSE GRB pulse catalog - preliminary data (Hakkila+, 2011)
Unification of pulses in long and short gamma-ray bursts: evidence from pulse
properties and their correlations.
Hakkila J., Preece R.D.
<Astrophys. J., 740, 104 (2011)>
=2011ApJ...740..104H 2011ApJ...740..104H
ADC_Keywords: Gamma rays ; Models
Keywords: gamma-ray burst: general - stars: statistics
Abstract:
We demonstrate that distinguishable gamma-ray burst (GRB) pulses
exhibit similar behaviors as evidenced by correlations among the
observable pulse properties of duration, peak luminosity, fluence,
spectral hardness, energy-dependent lag, and asymmetry. Long and Short
burst pulses exhibit these behaviors, suggesting that a similar
process is responsible for producing all GRB pulses. That these
properties correlate in the observer's frame indicates that intrinsic
correlations are strong enough to not be diluted into insignificance
by the dispersion in distances and redshift. We show how all
correlated pulse characteristics can be explained by hard-to-soft
pulse evolution, and we demonstrate that "intensity tracking" pulses
not having these properties are not single pulses; they instead appear
to be composed of two or more overlapping hard-to-soft pulses. In
order to better understand pulse characteristics, we recognize that
hard-to-soft evolution provides a more accurate definition of a pulse
than its intensity variation. This realization, coupled with the
observation that pulses begin near-simultaneously across a wide range
of energies, leads us to conclude that the observed pulse emission
represents the energy decay resulting from an initial injection, and
that one simple and as yet unspecified physical mechanism is likely to
be responsible for all GRB pulses regardless of the environment in
which they form and, if GRBs originate from different progenitors,
then of the progenitors that supply them with energy.
Description:
In this study, we analyze GRBs cataloged by the BATSE on NASA's
Compton Gamma-Ray Observatory.
The pulses described here are part of a BATSE GRB pulse catalog
currently being produced (J. Hakkila et al. 2012, in preparation) by
an analysis of the Current BATSE Catalog
(http://www.batse.msfc.nasa.gov/batse/grb/catalog/current/). The
process involves extracting pulses from summed four-channel 64ms GRB
data using the Bayesian Blocks methodology (Scargle
1998ApJ...504..405S 1998ApJ...504..405S) and subsequently fitting the possible pulse time
intervals with the four-parameter model of Norris et al.
(2005ApJ...627..324N 2005ApJ...627..324N).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
triggers.dat 12 608 BATSE trigger numbers included in table 1
(added at CDS)
table1.dat 103 1338 Gamma-ray burst pulse data used in this study
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See also:
IX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)
J/ApJ/720/1146 : Spectral analysis of GRBs (Lu+, 2010)
J/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010)
J/MNRAS/407/2075 : GRBs spectral peak estimator (Shahmoradi+, 2010)
J/ApJ/701/824 : Afterglows of short & long-duration GRBs (Nysewander+, 2009)
J/ApJS/169/62 : GRB database of spectral lags (Hakkila+, 2007)
J/other/APh/26.367 : GRB from RICE data (Besson+, 2007)
Byte-by-byte Description of file: triggers.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- --- [Trigger]
9- 12 I4 --- Trig BATSE trigger number from table 1
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Set [BATSE/UNTRG] "UNTRG" for untriggered pulse
6- 9 I4 --- Trig BATSE trigger number
10- 12 A3 --- Pulse BATSE pulse number (pNN) (1)
14 A1 --- class [SL] GRB class; S=Short, L=Long
16- 21 F6.2 s w Duration
23- 26 F4.2 s e_w ? The 1σ error in w
28- 33 F6.3 s lag ? Lag
35- 39 F5.3 s e_lag ? Uncertainty in lag
41- 47 F7.3 ct/cm2/s p64 ? The 64ms peak flux
49- 53 F5.3 ct/cm2/s e_p64 ? The 1σ error p64
55- 61 F7.3 --- HR ? Hardness ratio
63- 69 F7.3 --- e_HR ? The 1σ error HR
71- 75 F5.3 --- asym ? Asymmetry κ (2)
77- 89 F13.11 10-7J/cm2 S ? Energy fluence in channels 1+2+3 (erg/cm2)
91-103 F13.11 10-7J/cm2 e_S ? The 1σ error in S
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Note (1): BATSE fitted pulse number. The table contains the pulse properties for
1338 pulses from 610 BATSE GRBs. These are preliminary data from the
BATSE pulse catalog currently under development.
Note (2): defined in section 2 of paper: it ranges from κ=0 for a
symmetric pulse to κ=1 for an asymmetric pulse with a rapid rise
and slow decay. Uncertainties in pulse asymmetry are assumed to be ±0.05
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Feb-2013