- Home
- About
- Support
- Data Access
- Data Analysis
- GRB Products
- Publications
-
Links
Databases NED Simbad GCN circulars archive GRB data table Software & Tools Swift Software (HEASoft) Xanadu WebPIMMS Institutional Swift Sites GSFC PSU OAB SSDC MSSL University of Leicester
Catalogue XRT results for GRB 140323A
Data were analysed using HEASOFT version 6.32
Summary Information
| RA: | 23h 47m 50.22s | LC breaks: | 4 |
|---|---|---|---|
| Dec: | -79° 54′ 16.5′′ | LC type: | Canonical. |
| Err: | 1.5′′ | NH,intr.: | 4.92×1021 cm-2 |
| Gal long: | 306.370 | Redshift | Unknown |
| Gal lat: | -36.796 | Γ | 2.0 |
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
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.
Fit Details
| Nbreaks | χ2 | dof | Comments | Image |
|---|---|---|---|---|
| 0 | 1044 | 133 |  | |
| 1 | 461 | 131 | Break required. (5.63e-22 % probability of chance improvement) |  |
| 2 | 164 | 129 | Break required. (1.26e-27 % probability of chance improvement) |  |
| 3 | 136 | 127 | Break required. (7.18e-04 % probability of chance improvement) |  |
| 4 | 116 | 125 | Break required. (5.13e-03 % probability of chance improvement). This is the best fit. |  |
| 5 | 104 | 123 | Break significance <4-σ (0.11 % probability of chance improvement) |  |
There are 2 flares excluded from the fit:
- 87.0—90.8 s
- 103—157 s
The best-fitting light curve has 4 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.
| α1 | 4.08 (+0.24, -1.90) |
|---|---|
| Tb,1 | 161 (+11, -38) s |
| α2 | 6.1 (+0.9, -0.6) |
| Tb,2 | 214 (+6, -7) s |
| α3 | 0.576 (+0.041, -0.109) |
| Tb,3 | 5689 (+938, -2011) s |
| α4 | 1.19 (+0.09, -0.09) |
| Tb,4 | 2.82 (+0.55, -0.30) × 104 s |
| α5 | 2.08 (+0.30, -0.22) |
Spectra
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|phase5
phase1 spectrum (T0 + 101 to 161 s)
Download spectral files for phase1 spectrum.
Plots to download
WT mode. Mean photon arrival: T0+128 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 5.9 (+0.6, -0.6) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 1.71 (+0.07, -0.07) |
| Flux (0.3-10 keV) (Observed) | 7.25 (+0.28, -0.27) × 10-9 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 1.05 (+0.03, -0.04) × 10-8 erg cm-2 s-1 |
| Counts to flux (obs) | 4.99 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 7.23 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 703.45 (686) |
| Spectrum exposure | 60 s |
phase2 spectrum (T0 + 161 to 214 s)
Download spectral files for phase2 spectrum.
Plots to download
WT mode. Mean photon arrival: T0+180 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 5.02 (+1.02, -0.92) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 2.60 (+0.21, -0.20) |
| Flux (0.3-10 keV) (Observed) | 5.6 (+0.5, -0.5) × 10-10 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 1.52 (+0.34, -0.22) × 10-9 erg cm-2 s-1 |
| Counts to flux (obs) | 3.01 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 8.10 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 283.15 (325) |
| Spectrum exposure | 52 s |
phase3 spectrum (T0 + 214 to 5688 s)
Download spectral files for phase3 spectrum.
Plots to download
- both modes ps file
- both modes gif file
- wt mode ps file
- wt mode gif file
- pc mode ps file
- pc mode gif file
WT mode. Mean photon arrival: T0+249 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 3.5 (+1.3, -1.1) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 2.03 (+0.26, -0.24) |
| Flux (0.3-10 keV) (Observed) | 2.6 (+0.4, -0.3) × 10-10 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 4.2 (+0.5, -0.5) × 10-10 erg cm-2 s-1 |
| Counts to flux (obs) | 3.66 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 5.87 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 204.08 (263) |
| Spectrum exposure | 72 s |
PC mode. Mean photon arrival: T0+673 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 5.8 (+1.4, -1.2) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 2.13 (+0.21, -0.20) |
| Flux (0.3-10 keV) (Observed) | 1.73 (+0.18, -0.16) × 10-10 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 3.3 (+0.6, -0.4) × 10-10 erg cm-2 s-1 |
| Counts to flux (obs) | 4.04 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 7.58 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 253.97 (308) |
| Spectrum exposure | 544 s |
phase4 spectrum (T0 + 5690 to 28248 s)
Download spectral files for phase4 spectrum.
Plots to download
PC mode. Mean photon arrival: T0+12678 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 4.6 (+1.0, -0.9) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 1.93 (+0.16, -0.15) |
| Flux (0.3-10 keV) (Observed) | 1.97 (+0.17, -0.15) × 10-11 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 3.11 (+0.22, -0.16) × 10-11 erg cm-2 s-1 |
| Counts to flux (obs) | 4.29 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 6.78 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 284.04 (385) |
| Spectrum exposure | 3.7 ks |
phase5 spectrum (T0 + 28248 to 98422 s)
Download spectral files for phase5 spectrum.
Plots to download
PC mode. Mean photon arrival: T0+45506 s
| NH (Galactic) | 7.93 × 1020 cm-2 |
|---|---|
| NH (intrinsic) | 3.6 (+1.6, -1.3) × 1021 cm-2 |
| z of absorber | 0 |
| Photon index | 1.93 (+0.27, -0.25) |
| Flux (0.3-10 keV) (Observed) | 2.13 (+0.33, -0.28) × 10-12 erg cm-2 s-1 |
| Flux (0.3-10 keV) (Unabsorbed) | 3.24 (+0.40, -0.29) × 10-12 erg cm-2 s-1 |
| Counts to flux (obs) | 4.09 × 10-11 erg cm-2 ct-1 |
| Counts to flux (unabs) | 6.21 × 10-11 erg cm-2 ct-1 |
| W-stat (dof) What's this? | 200.18 (213) |
| Spectrum exposure | 8.9 ks |
Comparison with other bursts
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 140323A 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 indices | Break Times | NH | Spectral indices |
|---|---|---|---|
 |
 |
 |
 |
Closure Relationships
The plots below show (α, β) scatter plots for each phase of all Canonical light curves. GRB 140323A 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 |
|---|---|---|---|
 |  |  |  |