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Catalogue XRT results for GRB 120118B

Data were analysed using HEASOFT version 6.29

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Summary Information

RA:08h 19m 29.04sLC breaks:2
Dec:-07° 11′ 05.4′′LC type:Canonical.
Err:1.5′′NH,intr.:5.73×1022 cm-2
Gal long:229.912Redshift2.943
Gal lat:15.897Γ2.0
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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 4-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 120118B

Fit Details

Nbreaksχ2dofCommentsImage
035041Image of this fit
115039Break required.

(7.23e-06 % probability of chance improvement)
Image of this fit
224.737Break required.

(2.99e-13 % probability of chance improvement).
This is the best fit.
Image of this fit
322.535Break significance <4-σ
(19.04 % probability of chance improvement)
Image of this fit
419.733Break significance <4-σ
(10.42 % probability of chance improvement)
Image of this fit

There are no flares ignored from this fit.

The best-fitting light curve has 2 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.

α13.8 (+0.4, -0.4)
Tb,1336 (+42, -37) s
α2-0.58 (+0.29, -0.30)
Tb,22173 (+613, -374) s
α31.046 (+0.109, -0.099)

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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

phase1 spectrum (T0 + 115 to 335 s)

Download spectral files for phase1 spectrum.

Plots to download

WT and PC mode spectra of GRB 120118B

WT mode. Mean photon arrival: T0+124 s

NH (Galactic)9.36 × 1020 cm-2
NH (intrinsic)2.3 (+4.4, -2.3) × 1022 cm-2
z of absorber2.943
Photon index2.0 (+0.5, -0.4)
Flux (0.3-10 keV)
(Observed)
2.1 (+0.6, -0.5) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.8 (+0.8, -0.6) × 10-10 erg cm-2 s-1
Counts to flux (obs)3.09 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.19 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
60.49 (81)
Spectrum exposure19 s

PC mode. Mean photon arrival: T0+189 s

NH (Galactic)9.36 × 1020 cm-2
NH (intrinsic)1.5 (+3.2, -1.5) × 1022 cm-2
z of absorber2.943
Photon index1.9 (+0.4, -0.4)
Flux (0.3-10 keV)
(Observed)
3.3 (+1.0, -0.7) × 10-11 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
4.1 (+0.9, -0.7) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.62 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.55 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
71.50 (79)
Spectrum exposure200 s

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phase2 spectrum (T0 + 337 to 1570 s)

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Plots to download

PC mode spectrum of GRB 120118B

PC mode. Mean photon arrival: T0+968 s

NH (Galactic)9.36 × 1020 cm-2
NH (intrinsic)4.1 (+3.0, -2.4) × 1022 cm-2
z of absorber2.943
Photon index2.02 (+0.28, -0.26)
Flux (0.3-10 keV)
(Observed)
8.8 (+1.6, -1.3) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.24 (+0.20, -0.16) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.52 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.99 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
141.36 (158)
Spectrum exposure1.2 ks

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phase3 spectrum (T0 + 5317 to 775468 s)

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Plots to download

PC mode spectrum of GRB 120118B

PC mode. Mean photon arrival: T0+15118 s

NH (Galactic)9.36 × 1020 cm-2
NH (intrinsic)10 (+4, -3) × 1022 cm-2
z of absorber2.943
Photon index2.07 (+0.22, -0.20)
Flux (0.3-10 keV)
(Observed)
1.52 (+0.19, -0.17) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.46 (+0.37, -0.27) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.71 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)6.02 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
186.23 (249)
Spectrum exposure14.2 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 120118B 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 phase of all Canonical light curves. GRB 120118B is shown in colour; where multiple points appear in a given phase (e.g. WT and PC mode spectra for that phase), the different colours refer to different spectra. 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.

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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