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Swift-XRT GRB Catalogue results for GRB 071020

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Summary Information

RA:07h 58m 39.60sLC breaks:3
Dec:+32° 51′ 39.4′′LC type:Oddball
Err:3.5′′NH,intr.:1.12×1021 cm-2
Gal long:188.096°Redshift2.146
Gal lat:+27.618°Γ1.5
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Jump to: Light curve | Spectra | Compare to other bursts.

If you use any of these data, please cite Evans et al. (2009), which describes how these products were created (see the usage policy for more information).

Light curve

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This light curve comes from the light curve repository (if you use it, please cite Evans et al [2007, 2009]. Flares, marked by cross-hatched regions, are identified automatically, but may have been manually corrected. These are excluded from the fit. Any power-law breaks added to the fit must be required at the 3-σ level (according to an f-test) to be included in the best-fit. Details of all fits attempted are given below the plot. For more information see the light curve fitting documentation.

Fitted light curve of GRB 071020

Fit Details

Nbreaksχ2dofCommentsImage
0343193Image of this fit
1285191Break required.

(1.87e-06 % probability of chance improvement)
Image of this fit
2271189Break significance <4-σ
(0.74 % probability of chance improvement)
Image of this fit
3184187Break required.

(6.19e-15 % probability of chance improvement)
Image of this fit
4181185Break significance <4-σ
(18.17 % probability of chance improvement)
Image of this fit
5180183Break significance <4-σ
(40.45 % probability of chance improvement)
Image of this fit

There are no flares ignored from this fit.

The best-fitting light curve has 3 breaks.

Click on the number of breaks in the table to the right to change which fit is plotted above and detailed below.

Currently showing the best fit.

α10.82 (+0.07, -0.06)
Tb,1308 (+130, -64) s
α21.236 (+0.045, -0.028)
Tb,22.24 (+2.46, -0.70) × 104 s
α3-1.50 (+0.00, +2.06)
Tb,33.5 (+4.0, -0.3) × 104 s
α41.59 (+0.15, -0.12)
Flux11hr3.63e-12 erg cm-2 s-1

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Spectra

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Spectra have been created for each power-law segment in the best fitting light curve (shown above). Times of flaring have not been removed, however this makes little difference to most spectra (see Fig 7/8c of Evans et al. 2009). For more information see the time-resolved spectroscopy documentation.

Jump to: phase1|phase2|phase3|phase4

phase1 spectrum (T0 + 67 to 307 s)

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Plots to download

WT mode spectrum of GRB 071020

WT mode. Mean photon arrival: T0+165 s

NH (Galactic)6.25 × 1020 cm-2
NH (intrinsic)5.3 (+2.4, -2.3) × 1021 cm-2
z of absorber2.146
Photon index1.79 (+0.06, -0.06)
Flux (0.3-10 keV)
(Observed)
8.0 (+0.4, -0.3) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
9.3 (+0.3, -0.3) × 10-10 erg cm-2 s-1
Counts to flux (obs)3.68 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.28 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
516.64 (547)
Spectrum exposure240 s

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phase2 spectrum (T0 + 307 to 22438 s)

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WT and PC mode spectra of GRB 071020

WT mode. Mean photon arrival: T0+9799 s

NH (Galactic)6.25 × 1020 cm-2
NH (intrinsic)0 (+1.59 × 1021, -0) cm-2
z of absorber2.146
Photon index1.93 (+0.10, -0.09)
Flux (0.3-10 keV)
(Observed)
6.1 (+0.3, -0.4) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
6.7 (+0.5, -0.3) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.12 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)3.42 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
441.89 (431)
Spectrum exposure8.1 ks

PC mode. Mean photon arrival: T0+766 s

NH (Galactic)6.25 × 1020 cm-2
NH (intrinsic)10 (+52, -10) × 1020 cm-2
z of absorber2.146
Photon index1.51 (+0.13, -0.10)
Flux (0.3-10 keV)
(Observed)
1.55 (+0.15, -0.14) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.67 (+0.14, -0.12) × 10-10 erg cm-2 s-1
Counts to flux (obs)4.46 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.81 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
289.37 (323)
Spectrum exposure1.3 ks

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phase3 spectrum (T0 + 22438 to 23649 s)

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WT mode spectrum of GRB 071020

WT mode. Mean photon arrival: T0+23164 s

NH (Galactic)6.25 × 1020 cm-2
NH (intrinsic)5 (+48, -5) × 1021 cm-2
z of absorber2.146
Photon index3.50 (+2.55, -0.96)
Flux (0.3-10 keV)
(Observed)
1.2 (+0.5, -0.5) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.3 (+8.8, -1.3) × 10-12 erg cm-2 s-1
Counts to flux (obs)2.61 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)5.08 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
73.87 (87)
Spectrum exposure1.2 ks

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phase4 spectrum (T0 + 63097 to 1480630 s)

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PC mode spectrum of GRB 071020

PC mode. Mean photon arrival: T0+158584 s

NH (Galactic)6.25 × 1020 cm-2
NH (intrinsic)6 (+7, -6) × 1021 cm-2
z of absorber2.146
Photon index1.85 (+0.19, -0.18)
Flux (0.3-10 keV)
(Observed)
2.22 (+0.30, -0.25) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.62 (+0.30, -0.25) × 10-13 erg cm-2 s-1
Counts to flux (obs)3.61 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.28 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
193.50 (251)
Spectrum exposure82.9 ks

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Comparison with other bursts

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Parameter distributions

The plots below show the probability density functions of the temporal and time-averaged spectral parameters for all GRBs, with the data for GRB 071020 shown on in colour. Click the images for larger versions.

For all plots, the solid vertical lines mark the values for this GRB, and the dashed lines the 1-σ uncertainties. For α and Tb, the colour changes for each phase. For the spectral parameters, the WT fits are shown in blue and the PC in red. These figures correspond to Figs. 5,6, 7a and 8a of Evans et al. (2009). See the PDF documentation for more information.

Temporal indicesBreak TimesNHSpectral indices
Comparison of decay indices Comparison of light curve break times Comparison of intrinsic column densities Comparison of spectral energy indices

Closure Relationships

The plots below show (α, β) scatter plots for each of the different types/phases of light curves (see light-curve types), since GRB 071020 is of type, "Oddball," which has no scatter plots of its own. GRB 071020 is shown in colour, with each light curve phase, or XRT mode marked by a different colour. α and β are the temporal and spectral energy power-law indices respectively. The shaded regions mark those allowed by the standard closure relationships. These figures correspond to Fig. 10 of Evans et al. (2009). See the closure relationship documentation for more information.

No break
Comparison of nobreak closures
One-break, steep first
Steep phase
One-break, steep first
Shallow phase
Comparison of One-break, steep first, steep phase closuresComparison of One-break, steep first, shallow phase closures
One-break, shallow first
Shallow phase
One-break, shallow first
Steep phase
Comparison of One-break, shallow first, shallow phase closuresComparison of One-break, shallow first, steep phase closures
Canonical
Steep phase
Canonical
Plateau
Canonical
'Normal'
Canonical
Post jet-break
Comparison of Canonical, steep phase closuresComparison of Canonical, plateau phase closuresComparison of Canonical, normal phase closuresComparison of Canonical, post jet-break phase closures

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