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Catalogue XRT results for GRB 150403A

Data were analysed using HEASOFT version 6.32

Summary Information

RA:	20h 46m 01.17s	LC breaks:	5
Dec:	-62° 42′ 40.1′′	LC type:	Oddball.
Err:	1.4′′	N_H,intr.:	7.91×10²¹ cm^-2
Gal long:	333.154	Redshift	2.06
Gal lat:	-36.931	Γ	1.7

Show light curve? | Show spectrum? | Show comparison with other bursts?

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.

Fit Details

N_breaks	χ²	dof	Comments
0	1.24×10⁴	1726
1	1846	1724	Break required. (0.00e+00 % probability of chance improvement)
2	1530	1722	Break required. (1.07e-68 % probability of chance improvement)
3	1509	1720	Break required. (6.13e-04 % probability of chance improvement)
4	1489	1718	Break required. (9.66e-04 % probability of chance improvement)
5	1426	1716	Break required. (6.64e-15 % probability of chance improvement). This is the best fit.

There are 1 flares excluded from the fit:

67.8—97.8 s

The best-fitting light curve has 5 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	0.405 (+0.019, -0.020)
T_b,1	705 (+57, -72) s
α₂	0.85 (+0.04, -0.05)
T_b,2	4467 (+840, -678) s
α₃	1.36 (+0.04, -0.04)
T_b,3	5.28 (+0.12, -0.14) × 10⁴ s
α₄	8.00 (+0.00, -2.49)
T_b,4	5.715 (+0.101, -0.091) × 10⁴ s
α₅	-1.50 (+0.00, +0.60)
T_b,5	6.93 (+0.30, -0.19) × 10⁴ s
α₆	1.50 (+0.04, -0.04)

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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.

phase1 spectrum (T0 + 80 to 704 s)

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WT mode. Mean photon arrival: T0+358 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	6.4 (+0.7, -0.7) × 10²¹ cm^-2
z of absorber	2.06
Photon index	1.710 (+0.019, -0.019)
Flux (0.3-10 keV) (Observed)	3.16 (+0.04, -0.04) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.62 (+0.04, -0.04) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.85 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.40 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	806.26 (825)
Spectrum exposure	623 s

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phase2 spectrum (T0 + 704 to 1789 s)

Download spectral files for phase2 spectrum.

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WT mode. Mean photon arrival: T0+1175 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	9.3 (+0.9, -0.9) × 10²¹ cm^-2
z of absorber	2.06
Photon index	1.645 (+0.021, -0.021)
Flux (0.3-10 keV) (Observed)	1.555 (+0.023, -0.023) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.784 (+0.021, -0.021) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.05 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.65 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	774.71 (816)
Spectrum exposure	1.1 ks

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phase3 spectrum (T0 + 6852 to 52047 s)

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PC mode. Mean photon arrival: T0+23480 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	8.9 (+2.0, -2.0) × 10²¹ cm^-2
z of absorber	2.06
Photon index	1.69 (+0.05, -0.05)
Flux (0.3-10 keV) (Observed)	5.31 (+0.19, -0.18) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.14 (+0.17, -0.17) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.00 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.63 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	653.79 (637)
Spectrum exposure	10.8 ks

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phase4 spectrum (T0 + 53294 to 57147 s)

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PC mode. Mean photon arrival: T0+54830 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	1.2 (+1.9, -1.2) × 10²² cm^-2
z of absorber	2.06
Photon index	1.9 (+0.4, -0.4)
Flux (0.3-10 keV) (Observed)	1.19 (+0.35, -0.26) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.47 (+0.31, -0.26) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.65 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.51 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	64.42 (81)
Spectrum exposure	614 s

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phase5 spectrum (T0 + 57149 to 69342 s)

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PC mode. Mean photon arrival: T0+62154 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	6 (+6, -5) × 10²¹ cm^-2
z of absorber	2.06
Photon index	1.70 (+0.15, -0.14)
Flux (0.3-10 keV) (Observed)	1.32 (+0.14, -0.13) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.50 (+0.13, -0.12) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.93 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.50 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	273.15 (295)
Spectrum exposure	3.2 ks

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phase6 spectrum (T0 + 69344 to 4151488 s)

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Plots to download

PC mode. Mean photon arrival: T0+216251 s

N_H (Galactic)	5.35 × 10²⁰ cm^-2
N_H (intrinsic)	8.9 (+2.9, -2.8) × 10²¹ cm^-2
z of absorber	2.06
Photon index	1.81 (+0.07, -0.07)
Flux (0.3-10 keV) (Observed)	1.23 (+0.06, -0.06) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.46 (+0.06, -0.06) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.72 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.43 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	445.91 (520)
Spectrum exposure	113.5 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 150403A 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 T_b, 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	N_H	Spectral 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 150403A is of type, "Oddball," which has no scatter plots of its own. GRB 150403A 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

One-break, steep first Steep phase	One-break, steep first Shallow phase

One-break, shallow first Shallow phase	One-break, shallow first Steep phase

Canonical Steep phase	Canonical Plateau	Canonical 'Normal'	Canonical Post jet-break

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