J/ApJ/711/495 Durations of Swift/BAT GRBs (Butler+, 2010)
The cosmic rate, luminosity function, and intrinsic correlations of long
gamma-ray bursts.
Butler N.R., Bloom J.S., Poznanski D.
<Astrophys. J., 711, 495-516 (2010)>
=2010ApJ...711..495B 2010ApJ...711..495B
ADC_Keywords: Gamma rays
Keywords: dark ages, reionization, first stars - gamma rays: general -
methods: statistical
Abstract:
We calculate durations and spectral parameters for 207 Swift bursts
detected by the Burst Alert Telescope from 2007 April to 2009 August,
including 67 events with measured redshifts. This is the first
supplement to our catalog of 425 Swift gamma-ray bursts (GRBs; 147
with redshifts) starting from GRB 041220. This complete and extensive
data set, analyzed with a unified methodology, allows us to conduct an
accurate census of intrinsic GRB energetics, hardnesses, durations,
and redshifts. The GRB world model we derive reproduces well the
observables from both Swift and pre-Swift satellites. Comparing to the
cosmic star formation rate, we estimate that only about 0.1% of
massive stars explode as bright GRBs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 110 207 BAT trigger statistics and durations
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See also:
J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011)
J/ApJ/701/824 : Afterglows of short and long-duration GRBs (Nysewander+,
2009)
J/ApJ/704/1405 : Testing the Epeak-Eiso relation for GRBs (Krimm+, 2009)
J/ApJS/175/179 : The BAT1 gamma-ray burst catalog (Sakamoto+, 2008)
J/AJ/133/1027 : Positions for 179 Swift X-ray afterglows (Butler+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB identification (YYMMDDA)
9- 19 A11 "h:m:s" Time Trigger UTC time
21- 28 F8.3 s StB Burst region start time
30- 36 F7.3 s EndB Burst region end time
38- 43 F6.2 s T90 Burst T90 duration (1)
45- 50 F6.2 s e_T90 T90 uncertainty
52- 58 F7.3 s T50 Burst T50 duration (1)
60- 65 F6.3 s e_T50 T50 uncertainty
67- 73 F7.3 s Tr45 TR45 duration (1)
76- 81 F6.3 s e_Tr45 Tr45 uncertainty
84- 90 F7.4 1/s p/ct Ratio of the peak rate ratep (in a time bin of
width 0.01dt) over the total source counts
92- 97 F6.4 1/s e_p/ct Rate/Ct uncertainty
99-104 F6.2 s dt Time bin (dtS/N)
106-110 F5.1 --- S/N S/N of the highest S/N trigger
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Note (1): Using the burst intervals for each event, we form the cumulative
distribution of source counts and record the time values according to
when a fraction of 5%, 25%, 75%, and 95% of the total counts arrive
relative to the start of the burst interval. The difference between
the 75th and 25th percentile times defines the burst T50 duration,
while the difference between the 95th and 5th percentile time defines
the burst T90 duration. We also determine a measure of duration
TR45 according to the prescription of Reichart et al.
(2001ApJ...552...57R 2001ApJ...552...57R). See section 2 of Paper I (Butler et al.,
2007ApJ...671..656B 2007ApJ...671..656B) for further explanations.
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History:
* 03-Apr-2012: From electronic version of the journal
* 17-May-2012: GRB 090301 replaced by 090301A (2 GRBs this day)
References:
Butler et al. Paper I. Complete catalog of Swift GRBs. 2007ApJ...671..656B 2007ApJ...671..656B
(End) Emmanuelle Perret [CDS] 03-Apr-2012