Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Mon Jan 13 01:23:20 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger531267
======================================================================
Trigger: 00531267 Segment: 000
BAT Trigger Time: 366878992.384 [s; MET]
Trigger Stop: 366878993.408 [s; MET]
UTC: 2012-08-17T06:49:42.837740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.705914335871 Dec: -38.3405242211228 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 15.8429795177549 [ if not an image trigger ]
Image S/N Ratio: 7.78
Analysis Position: [ source = BAT ]
RA: 250.705914335871 Dec: -38.3405242211228 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 250.694972830339 Dec: -38.3751760025687 [deg; J2000]
{ 16h 42m 46.8s , -38d 22' 30.6" }
+/- 1.46853638088234 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672906127213205 [arcmin] (formal 1-sigma fit error)
SNR: 17.5675683287732
Angular difference between the analysis and refined position is 2.141890 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 28.2080000042915 +/- 6.6641920130064
Measured from: -1.52799999713898
to: 26.6800000071526 [s; relative to TRIGTIME]
T50: 11.9360000491142 +/- 1.31239019026551
Measured from: 1.39999997615814
to: 13.3360000252724 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.11599999666214
to: 0.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.24800002574921
to: 30.7760000228882 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.486807 0.507778 0.262560 0.049265
0.037102 0.033827 0.027880 0.023080 [error]
Peak 0.024395 0.046142 0.030909 0.009083
0.006775 0.006500 0.005351 0.004137 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 33.024 -2.248 30.776
T90 28.208 -1.528 26.680
T50 11.936 1.400 13.336
Peak 1.000 -0.116 0.884
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.972 -0.160 0.154 - - - 2.28e-03 -2.16e-04 2.12e-04 67.000 57
CPL -1.825 -0.371 0.676 53.193 -50.099 -53.193 2.74e-03 -1.27e-03 3.63e-03 66.830 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.298 -0.286 0.295 - - - 6.84e-03 -1.19e-03 1.19e-03 67.770 57
CPL -0.158 -0.899 1.943 81.692 -26.118 -81.692 2.52e-02 -2.52e-02 2.08e-01 65.530 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 1.50e-07 2.07e-07 2.11e-07 3.91e-07 6.92e-07 9.58e-07 erg/cm2
90%_error_low -1.83e-08 -1.62e-08 -2.77e-08 -9.64e-08 -6.23e-08 -1.25e-07 erg/cm2
90%_error_hi 1.89e-08 1.62e-08 2.79e-08 1.16e-07 6.32e-08 1.40e-07 erg/cm2
Peak flux PL 2.32e-01 2.63e-01 2.14e-01 2.91e-01 8.15e-01 1.00e+00 ph/cm2/s
90%_error_low -7.14e-02 -5.39e-02 -4.29e-02 -1.03e-01 -1.48e-01 -1.78e-01 ph/cm2/s
90%_error_hi 7.88e-02 5.30e-02 4.24e-02 1.35e-01 1.49e-01 1.79e-01 ph/cm2/s
Fluence CPL 1.47e-07 2.10e-07 2.10e-07 4.50e-07 6.95e-07 1.02e-06 erg/cm2
90%_error_low -2.15e-08 -1.94e-08 -2.87e-08 -1.58e-07 -6.72e-08 -3.61e-07 erg/cm2
90%_error_hi 1.97e-08 2.13e-08 2.85e-08 5.21e-08 5.81e-08 7.56e-08 erg/cm2
Peak flux CPL 1.87e-01 2.90e-01 2.33e-01 9.97e-02 7.79e-01 8.10e-01 ph/cm2/s
90%_error_low -8.34e-02 -6.46e-02 -5.04e-02 -9.97e-02 -1.55e-01 -1.77e-01 ph/cm2/s
90%_error_hi 9.26e-02 6.93e-02 5.19e-02 2.37e-01 1.55e-01 2.64e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 250.6950 -38.3752 0.0110 19.6093 -131.6494 1.3614812 17.568 TRIG_00531267 Foreground time interval of the image: -2.248 30.776 (delta_t = 33.024 [sec]) Background time interval of the image: -70.283 -2.248 (delta_t = 68.035 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -2.248 sec. to 30.776 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.97151 ( -0.159674 0.154367 ) Norm@50keV : 2.27527E-03 ( -0.000216123 0.000212153 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.00 using 59 PHA bins. # Reduced chi-squared = 1.175 for 57 degrees of freedom # Null hypothesis probability = 1.713835e-01 Photon flux (15-150 keV) in 33.02 sec: 0.336921 ( -0.027126 0.0272 ) ph/cm2/s Energy fluence (15-150 keV) : 6.92033e-07 ( -6.22846e-08 6.31758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.248 sec. to 30.776 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.82465 ( -0.371371 0.676229 ) Epeak [keV] : 53.1931 ( -50.0986 -53.1931 ) Norm@50keV : 2.73904E-03 ( -0.00126556 0.0036253 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.83 using 59 PHA bins. # Reduced chi-squared = 1.193 for 56 degrees of freedom # Null hypothesis probability = 1.523678e-01 Photon flux (15-150 keV) in 33.02 sec: 0.334146 ( -0.029446 0.029251 ) ph/cm2/s Energy fluence (15-150 keV) : 6.94556e-07 ( -6.71812e-08 5.8101e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.116 sec. to 0.884 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29825 ( -0.286421 0.29489 ) Norm@50keV : 6.83712E-03 ( -0.00119497 0.00119497 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.77 using 59 PHA bins. # Reduced chi-squared = 1.189 for 57 degrees of freedom # Null hypothesis probability = 1.554649e-01 Photon flux (15-150 keV) in 1 sec: 0.815440 ( -0.148423 0.149299 ) ph/cm2/s Energy fluence (15-150 keV) : 6.7599e-08 ( -1.26436e-08 1.27721e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 0.884 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.158333 ( -0.899529 1.94303 ) Epeak [keV] : 81.6921 ( -26.1087 -81.6828 ) Norm@50keV : 2.52458E-02 ( -0.0252535 0.208035 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.53 using 59 PHA bins. # Reduced chi-squared = 1.170 for 56 degrees of freedom # Null hypothesis probability = 1.798135e-01 Photon flux (15-150 keV) in 1 sec: 0.779179 ( -0.155228 0.155391 ) ph/cm2/s Energy fluence (15-150 keV) : 6.21384e-08 ( -1.45052e-08 1.44371e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 28.208 sec. Hardness ratio (energy fluence ratio) = 1.01997616997
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.561893e-07 S(50-150 keV) = 3.35847e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -2.367647789157554E-01, IMY = 2.662115532398123E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -70.283400 -2.248000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9794 -15.6486 0.6 24.7 -68.3 2.3563 20.8 0.5 Sco X-1 256.0022 -37.8464 0.8 16.0 -138.7 1.2227 14.1 0.8 4U 1700-377 256.2673 -36.2596 0.0 14.8 -134.7 0.0674 0.8 12.7 GX 349+2 262.8397 -24.8914 0.0 5.7 -76.8 0.0078 0.1 12.7 GX 1+4 264.6838 -44.3027 6.0 18.4 -169.0 0.1733 1.9 9.2 4U 1735-44 268.3347 -1.4416 2.8 24.8 -0.3 0.4081 4.2 2.1 SW J1753.5-0127 270.1323 -24.9560 70.7 1.6 41.5 0.0129 0.2 11.1 GX 5-1 270.4358 -25.5892 4.4 1.4 66.7 0.2115 2.6 11.7 GRS 1758-258 274.1421 -13.9647 5.6 13.2 23.8 0.1797 2.0 9.0 GX 17+2 276.0983 -30.3614 2.8 7.5 126.5 0.3390 4.2 9.0 H1820-303 284.8714 -24.9360 11.3 14.4 89.7 -0.1047 -1.0 9.0 HT1900.1-2455 288.8386 10.9441 1.6 41.9 31.2 1.3637 7.0 2.4 GRS 1915+105 262.9588 -33.9362 5.8 9.3 -146.3 -0.1775 -2.0 6.3 GX 354-0 277.2152 29.0746 2.3 55.8 9.9 2.5660 5.0 ------ UNKNOWN 267.8057 10.5370 2.4 36.8 -0.7 0.5943 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.248000 30.776000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0469 -15.7854 14.5 24.6 -68.5 -0.0746 -0.8 9.5 Sco X-1 256.0545 -37.8791 4.8 16.0 -138.9 -0.1730 -2.4 3.8 4U 1700-377 256.5811 -36.4552 4.3 14.7 -135.9 0.1910 2.7 7.3 GX 349+2 263.0397 -24.8047 7.4 5.5 -75.5 0.1097 1.6 3.9 GX 1+4 264.9015 -44.3036 8.1 18.4 -169.5 0.1029 1.4 11.1 4U 1735-44 268.3975 -1.6020 11.4 24.6 -0.1 -0.0796 -1.0 9.1 SW J1753.5-0127 270.1480 -25.2178 7.5 1.4 48.7 0.1028 1.6 11.1 GX 5-1 270.4257 -25.8227 5.3 1.4 75.5 0.1528 2.3 8.2 GRS 1758-258 273.8640 -14.1917 0.0 12.8 23.1 0.0776 1.1 12.4 GX 17+2 275.8147 -30.5246 19.3 7.4 128.5 -0.0394 -0.6 11.0 H1820-303 284.8670 -24.9084 9.7 14.4 89.6 0.0940 1.2 9.2 HT1900.1-2455 288.6623 10.9823 4.4 41.8 31.0 -0.4048 -2.6 8.3 GRS 1915+105 262.8868 -33.6821 5.0 9.2 -145.1 0.1579 2.3 10.5 GX 354-0 250.6950 -38.3752 0.7 19.6 -131.6 1.3614 17.6 ------ UNKNOWN 247.1080 -55.5511 2.4 33.4 -156.2 0.4117 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: