J/MNRAS/428/729 GRB Swift X-ray light curves analysis (Margutti+, 2013)
The prompt-afterglow connection in gamma-ray bursts: a comprehensive statistical
analysis of Swift X-ray light curves.
Margutti R., Zaninoni E., Bernardini M.G., Chincarini G., Pasotti F.,
Guidorzi C., Angelini L., Burrows D.N., Capalbi M., Evans P.A., Gehrels N.,
Kennea J., Mangano V., Moretti A., Nousek J., Osborne J.P., Page K.L.,
Perri M., Racusin J., Romano P., Sbarufatti B., Stafford S., Stamatikos M.
<Mon. Not. R. Astron. Soc., 428, 729-742 (2013)>
=2013MNRAS.428..729M 2013MNRAS.428..729M
ADC_Keywords: Gamma rays ; X-ray sources
Keywords: radiation mechanism: non-thermal - gamma-ray burst: general
Abstract:
We present a comprehensive statistical analysis of Swift X-ray light
curves of gamma-ray bursts (GRBs) collecting data from more than 650
GRBs discovered by Swift and other facilities. The unprecedented
sample size allows us to constrain the rest-frame X-ray properties of
GRBs from a statistical perspective, with particular reference to
intrinsic time-scales and the energetics of the different light-curve
phases in a common rest-frame 0.3-30keV energy band. Temporal
variability episodes are also studied and their properties
constrained. Two fundamental questions drive this effort: (i) Does the
X-ray emission retain any kind of 'memory' of the prompt γ-ray
phase? (ii) Where is the dividing line between long and short GRB
X-ray properties? We show that short GRBs decay faster, are less
luminous and less energetic than long GRBs in the X-rays, but are
interestingly characterized by similar intrinsic absorption. We
furthermore reveal the existence of a number of statistically
significant relations that link the X-ray to prompt γ-ray
parameters in long GRBs; short GRBs are outliers of the majority of
these two-parameter relations. However and more importantly, we report
on the existence of a universal three-parameter scaling that links the
X-ray and the γ-ray energy to the prompt spectral peak energy of
both long and short GRBs:
EX,iso∝E1.00±0.06γ,iso/E0.60±0.10pk.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fitkcorr.dat 566 437 Best-fitting parameters of the 0.3-10keV (observer
frame) light curves in de-absorbed flux units
fluence.dat 466 437 0.3-10keV (observer frame) fluence table
energy.dat 457 165 0.3-10keV (rest frame) energy table
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See also:
J/A+A/510/A48 : Palermo Swift-BAT Hard X-ray Catalogue (Cusumano+, 2010)
J/A+A/551/A142 : 7 year Swift-XRT point source catalog (1SWXRT) (D'Elia+, 2013
Byte-by-byte Description of file: fitkcorr.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB name (YYMMDDA)
9- 13 A5 --- Type Type of light curve fitting function (G1)
15- 25 F11.9 --- z ?=0 Redshift, if known
27- 47 F21.18 --- alpha1 Power-law decay index α1 (G1)
49- 68 F20.18 --- e_alpha1 Error on alpha1
70- 90 F21.18 --- alpha2 ?=-9 Power-law decay index α2 (G1)
92-112 F21.18 --- e_alpha2 ?=-9 Error on alpha2
114-133 F20.17 --- alpha3 ?=-9 Power-law decay index α3 (G1)
135-155 F21.18 --- e_alpha3 ?=-9 Error on alpha3
157-175 F19.16 --- alpha4 ?=-9 Power-law decay index α4 (G1)
177-197 F21.18 --- e_alpha4 ?=-9 Error on alpha4
199-217 F19.16 [s] logtb1 ?=-9 Break time tb1 (logarithm) (G1)
219-240 F22.19 [s] e_logtb1 ?=-9 Error on logtb1
242-260 F19.16 [s] logtb2 ?=-9 Break time tb2 (logarithm) (G1)
262-282 F21.18 [s] e_logtb2 ?=-9 Error on logtb2
284-302 F19.16 [s] logtb3 ?=-9 Break time tb3 (logarithm) (G1)
304-324 F21.18 [s] e_logtb3 ?=-9 Error on logtb3
326-346 E21.17 10-13W/m2 N1 ?=-9 Normalisation N1 (G1)
348-370 E23.19 10-13W/m2 e_N1 ?=-9 Error on N1
372-392 E21.17 10-13W/m2 N2 ?=-9 Normalisation N2 (G1)
394-414 E21.17 10-13W/m2 e_N2 ?=-9 Error on N2
416-437 F22.18 --- s1 Smoothness parameter s1 (G1)
439-458 F20.17 --- s2 Smoothness parameter s2 (G1)
460-466 F7.2 s T90 ?=0 T90 duration
468-492 F25.19 --- alpha90 ?=-9 Power-law index α1 with t0=T90
494-514 E21.17 --- e_alpha90 ?=-9 Error on alpha90
516-537 F22.17 --- chi2 χ2 fit value
539-543 F5.0 --- dof [3/7509] Number of degrees of freedom
545-566 E22.20 --- p [0/1] associated p-value
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Byte-by-byte Description of file: fluence.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB name (YYMMDDA)
9- 13 A5 --- Type Type of fitting function (G1)
15- 25 F11.9 --- z ?=0 Redshift
27- 44 F18.16 [s] logT0 Initial time of observation (logarithm)
46- 63 F18.16 [s] logT1 Final time of observation (logarithm)
65- 87 E23.19 mJ/m2 SX Total fluence in observed 0.3-10 keV band
89-110 E22.18 mJ/m2 e_SX ?=-9 Error on SX
112-134 E23.19 mJ/m2 S1 ?=-9 Fluence in first segment
136-157 E22.18 mJ/m2 e_S1 ?=-9 Error on S1
159-179 E21.17 mJ/m2 S2 ?=-9 Fluence in second segment
181-203 E23.19 mJ/m2 e_S2 ?=-9 Error on S2
205-225 E21.17 mJ/m2 S3 ?=-9 Fluence in third segment
227-247 E21.17 mJ/m2 e_S3 ?=-9 Error on S3
249-269 E21.17 mJ/m2 S4 ?=-9 Fluence in fourth segment
271-291 E21.17 mJ/m2 e_S4 ?=-9 Error on S4
293-313 E21.17 mJ/m2 S1fl ?=-9 Flare fluence in the first segment
315-335 E21.17 mJ/m2 e_S1fl ?=-9 Error on S1fl
337-357 E21.17 mJ/m2 S2fl ?=-9 Flare fluence in the second segment
359-379 E21.17 mJ/m2 e_S2fl ?=-9 Error on S2fl
381-401 E21.17 mJ/m2 S3fl ?=-9 Flare fluence in the third segment
403-423 E21.17 mJ/m2 e_S3fl ?=-9 Error on S3fl
425-444 E20.16 mJ/m2 S4fl ?=-9 Flare fluence in the fourth segment
446-466 E21.17 mJ/m2 e_S4fl ?=-9 Error on S4fl
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Byte-by-byte Description of file: energy.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GRB GRB name (YYMMDDA)
9- 13 A5 --- Type Type of fitting function; (G1)
15- 25 F11.9 --- z ?=0 redshift
27- 44 F18.16 [s] logT0 Initial time of observation (logarithm)
46- 63 F18.16 [s] logT1 Final time of observation (logarithm)
65- 85 E21.17 10-7W EX ?=-9 Total energy in rest frame 0.3-30keV band
87-107 E21.17 10-7W e_EX ?=-9 Error on EX
109-129 E21.17 10-7W E1 ?=-9 Energy in first segment
131-151 E21.17 10-7W e_E1 ?=-9 Error on E1
153-173 E21.17 10-7W E2 ?=-9 Energy in second segment
175-195 E21.17 10-7W e_E2 ?=-9 Error on E2
197-217 E21.17 10-7W E3 ?=-9 Energy in third segment
219-239 E21.17 10-7W e_E3 ?=-9 Error on E3
241-261 E21.17 10-7W E4 ?=-9 Energy in fourth segment
263-283 E21.17 10-7W e_E4 ?=-9 Error on E4
285-305 E21.17 10-7W E1fl ?=-9 Flare energy in the first segment
307-327 E21.17 10-7W e_E1fl ?=-9 Error on E1fl
329-349 E21.17 10-7W E2fl ?=-9 Flare energy in the second segment
351-371 E21.17 10-7W e_E2fl ?=-9 Error on E2fl
373-393 E21.17 10-7W E3fl ?=-9 Flare energy in the third segment
395-415 E21.17 10-7W e_E3fl ?=-9 Error on E3fl
417-436 E20.17 10-7W E4fl ?=-9 Flare energy in the fourth segment
438-457 E20.17 10-7W e_E4fl ?=-9 Error on E4fl
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Gloval Notes:
Note (G1): the light-curve fitting consists of model 0, I, II or III, plus
the characterisation "C", "U", "F" or "N" (see section 2.1):
0 = simple decaying power-law f(N1,α1,t): N1t-α1
I = smoothed broken power-law g(N1,α1,α2,tb1,s1,t):
N1(G1(t)+G2(t))s, with
G1(t)=(t/tb)-α1/s, G2(t)=(t/tb)-α2/s
II = smoothed broken power-law plus initial power-law decay:
f(N1,α1,t) + g(N2,α2,α3,tb2,s1,t)
III = double smoothly joined broken power-laws:
g(N1,α1,α2,tb1,s1,t) +
g(N2,α3,α4,tb2,s2,t)
C = "complete" light curve (the fading could be followed)
U = "uncomplete" (truncated) light curve
F = light curve showing flares
N = light curve showing no flare
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Dec-2013