J/ApJ/756/44 Spectral lags and counts of the RHESSI GRBs (Ripa+, 2012)
On the spectral lags and peak counts of the gamma-ray bursts detected by the
RHESSI satellite.
Ripa J., Meszaros A., Veres P., Park I.H.
<Astrophys. J., 756, 44 (2012)>
=2012ApJ...756...44R 2012ApJ...756...44R
ADC_Keywords: Gamma rays
Keywords: gamma-ray burst: general
Abstract:
A sample of 427 gamma-ray bursts (GRBs) from a database (2002
February-2008 April) of the RHESSI satellite is analyzed
statistically. The spectral lags and peak-count rates, which have been
calculated for the first time in this paper, are studied, completing
an earlier analysis of durations and hardness ratios. The analysis of
the RHESSI database has already inferred the existence of a third
group with intermediate duration, apart from the so-called short and
long groups. The first aim of this article is to discuss the
properties of these intermediate-duration bursts in terms of
peak-count rates and spectral lags. The second aim is to discuss the
number of GRB groups using another statistical method and by also
employing the peak-count rates and spectral lags. The standard
parametric (model-based clustering) and non-parametric (K-means
clustering) statistical tests together with the Kolmogorov-Smirnov and
Anderson-Darling tests are used. Two new results are obtained. (1) The
intermediate-duration group has properties similar to those of the
group of short bursts. Intermediate and long groups appear to be
different. (2) The intermediate-duration GRBs in the RHESSI and Swift
databases seem to be represented by different phenomena.
Description:
In this paper, we study the same list of bursts that was published in
Ripa et al. (2009, Cat. J/A+A/498/399). We consider 427 GRBs from the
period between 2002 February 14 and 2008 April 25 observed with the
Ramaty High Energy Solar Spectroscopic Imager (RHESSI).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table9.dat 48 427 The spectral lags and peak-count rates of the
RHESSI γ-ray bursts (GRBs)
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See also:
J/ApJS/209/20 : Swift GRB catalog with X-ray data (Grupe+, 2013)
J/ApJS/208/21 : The BATSE 5B GRB spectral catalog (Goldstein+, 2013)
J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013)
J/PASP/124/297 : GRB spectral lags (Li+, 2012)
J/ApJ/746/170 : Follow-up resources for high-redshift GRBs (Morgan+, 2012)
J/ApJ/731/103 : Redshift catalog for Swift long GRBs (Xiao+, 2011)
J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011)
J/A+A/530/A21 : Spectral properties of 438 GRBs (Nava+, 2011)
J/ApJ/715/1438 : Gravitational-wave bursts with GRBs (Abbott+, 2010)
J/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010)
J/ApJ/704/1405 : Testing the Epeak-Eiso relation for GRBs (Krimm+, 2009)
J/ApJ/701/824 : Afterglows of short & long-duration GRBs (Nysewander+, 2009)
J/ApJ/690/163 : The first Swift UV-Opt GRB afterglow catalog (Roming+, 2009)
J/A+A/498/399 : GRB observed with RHESSI satellite (Ripa+, 2009)
J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)
J/ApJS/175/179 : The BAT1 gamma-ray burst catalog (Sakamoto+, 2008)
J/ApJS/169/62 : GRB database of spectral lags (Hakkila+, 2007)
J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)
J/ApJ/508/314 : Gamma-ray bursts types (Mukherjee+, 1998)
http://hesperia.gsfc.nasa.gov/rhessi2/ : RHESSI home page
Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB RHESSI GRB number (YYMMDDA)
9 I1 --- Gr GRB group assignment: 1=short, 2=intermediate,
3=long
11- 17 F7.1 ms Lag [-2347/6775]? Spectral lag (1)
19- 24 F6.1 ms E_Lag ? Upper uncertainty limit in Lag (1)
26- 31 F6.1 ms e_Lag ? Lower uncertainty limit in Lag (1)
33- 40 F8.1 s-1 Flux [149/135200] Peak 25-1500 keV count rate
42- 48 F7.1 s-1 e_Flux [26/10874] The 1σ statistical
uncertainty in Flux
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Note (1): Calculated from the difference of the light-curves at the energy
intervals 400-1500keV and 25-120 keV. The errors compose of the 95%
confidence limit statistical uncertainty and the light-curve's time
resolution.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Mar-2014