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 Aug 28 18:04:05 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger767284
======================================================================
Trigger: 00767284 Segment: 000
BAT Trigger Time: 524095320.576 [s; MET]
Trigger Stop: 524095321.6 [s; MET]
UTC: 2017-08-10T22:01:41.068460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 187.950444369931 Dec: 3.64679568014333 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.65
Image Trigger?: NO
Rate S/N Ratio: 23.3238075793812 [ if not an image trigger ]
Image S/N Ratio: 9.65
Analysis Position: [ source = BAT ]
RA: 187.950444369931 Dec: 3.64679568014333 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 187.928317316525 Dec: 3.6653131335646 [deg; J2000]
{ 12h 31m 42.8s , +03d 39' 55.1" }
+/- 0.985284551288413 [arcmin] (estimated 90% radius based on SNR)
+/- 0.282370755904764 [arcmin] (formal 1-sigma fit error)
SNR: 31.0681926494546
Angular difference between the analysis and refined position is 1.729116 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 152.419999957085 +/- 21.4978838612162
Measured from: -17.7759999632835
to: 134.643999993801 [s; relative to TRIGTIME]
T50: 75.3639999628067 +/- 8.12083078420974
Measured from: 7.03600001335144
to: 82.3999999761581 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.15200001001358
to: 1.15200001001358 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.3319999575615
to: 157.740000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.648225 2.520860 2.180564 0.680986
0.078790 0.083031 0.074593 0.066011 [error]
Peak 0.023931 0.057249 0.053393 0.041267
0.006309 0.007224 0.006861 0.005859 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 182.072 -24.332 157.740
T90 152.420 -17.776 134.644
T50 75.364 7.036 82.400
Peak 1.000 0.152 1.152
====== 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 -1.227 -0.070 0.070 - - - 2.57e-03 -9.32e-05 9.32e-05 61.220 57
CPL -1.227 -0.066 0.128 9999.360 -9999.360 -9999.360 2.58e-03 -9.33e-05 1.97e-04 61.340 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -0.644 -0.242 0.267 - - - 1.05e-02 -1.55e-03 1.49e-03 87.300 57
CPL -0.641 -0.240 0.344 9999.340 -9999.340 -9999.340 1.06e-02 -1.43e-03 5.43e-03 87.340 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 4.62e-07 1.00e-06 1.72e-06 6.76e-06 4.71e-06 9.94e-06 erg/cm2
90%_error_low -3.53e-08 -4.44e-08 -7.41e-08 -6.71e-07 -1.86e-07 -7.08e-07 erg/cm2
90%_error_hi 3.63e-08 4.42e-08 7.38e-08 7.24e-07 1.86e-07 7.54e-07 erg/cm2
Peak flux PL 1.91e-01 3.22e-01 4.12e-01 1.06e+00 1.22e+00 1.98e+00 ph/cm2/s
90%_error_low -5.98e-02 -6.53e-02 -5.18e-02 -2.81e-01 -1.62e-01 -2.93e-01 ph/cm2/s
90%_error_hi 6.76e-02 6.36e-02 5.17e-02 3.58e-01 1.62e-01 3.27e-01 ph/cm2/s
Fluence CPL 4.62e-07 1.00e-06 1.72e-06 6.72e-06 4.73e-06 1.00e-05 erg/cm2
90%_error_low -3.53e-08 -4.45e-08 -7.42e-08 N/A -2.11e-07 -1.53e-06 erg/cm2
90%_error_hi 3.63e-08 4.40e-08 7.39e-08 N/A 1.61e-07 2.03e-07 erg/cm2
Peak flux CPL 1.91e-01 3.22e-01 4.12e-01 1.05e+00 1.22e+00 2.06e+00 ph/cm2/s
90%_error_low N/A -6.54e-02 N/A N/A -1.62e-01 -6.50e-01 ph/cm2/s
90%_error_hi N/A 6.37e-02 N/A N/A 1.62e-01 3.46e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 187.9283 3.6653 0.0062 24.3500 -166.6983 2.6110864 31.068 TRIG_00767284 Foreground time interval of the image: -24.332 16.525 (delta_t = 40.857 [sec]) Background time interval of the image: -239.576 -24.332 (delta_t = 215.244 [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 -24.332 sec. to 157.740 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22674 ( -0.0699957 0.0704736 ) Norm@50keV : 2.56540E-03 ( -9.32103e-05 9.31616e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.22 using 59 PHA bins. # Reduced chi-squared = 1.074 for 57 degrees of freedom # Null hypothesis probability = 3.270881e-01 Photon flux (15-150 keV) in 182.1 sec: 0.302310 ( -0.01168 0.01173 ) ph/cm2/s Energy fluence (15-150 keV) : 4.70501e-06 ( -1.85826e-07 1.86467e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.332 sec. to 157.740 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22699 ( -0.06651 0.127725 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 2.57746E-03 ( -9.32387e-05 0.00019752 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.34 using 59 PHA bins. # Reduced chi-squared = 1.095 for 56 degrees of freedom # Null hypothesis probability = 2.905632e-01 Photon flux (15-150 keV) in 182.1 sec: 0.302231 ( -0.011693 0.011719 ) ph/cm2/s Energy fluence (15-150 keV) : 4.72868e-06 ( -2.11371e-07 1.60768e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.152 sec. to 1.152 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.643958 ( -0.242263 0.267078 ) Norm@50keV : 1.04790E-02 ( -0.00155162 0.00148994 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 87.30 using 59 PHA bins. # Reduced chi-squared = 1.532 for 57 degrees of freedom # Null hypothesis probability = 6.040391e-03 Photon flux (15-150 keV) in 1 sec: 1.21745 ( -0.16185 0.16247 ) ph/cm2/s Energy fluence (15-150 keV) : 1.31256e-07 ( -1.72914e-08 1.73444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 1.152 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.640653 ( -0.239797 0.344013 ) Epeak [keV] : 9999.34 ( -9999.36 -9999.36 ) Norm@50keV : 1.05776E-02 ( -0.00142554 0.00543635 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 87.34 using 59 PHA bins. # Reduced chi-squared = 1.560 for 56 degrees of freedom # Null hypothesis probability = 4.653480e-03 Photon flux (15-150 keV) in 1 sec: 1.21715 ( -0.16182 0.16243 ) ph/cm2/s Energy fluence (15-150 keV) : 1.22098e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 152.42 sec. Hardness ratio (energy fluence ratio) = 1.70915047001
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.4660543e-06 S(50-150 keV) = 3.238976e-06
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 = -4.404271815784693E-01, IMY = 1.041262044138435E-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: -239.576000 -24.332000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.4263 77.7250 2.3 55.4 6.8 4.9805 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -24.332000 16.524590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 187.9283 3.6653 0.4 24.4 -166.7 2.6111 31.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.524590 962.526900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 203.4986 -43.6546 3.3 49.3 148.0 10.3398 3.5 ------ UNKNOWN 217.5622 46.4955 3.8 49.9 9.2 4.6064 3.1 ------ UNKNOWN 202.5185 57.5994 2.6 55.1 -7.8 8.7898 4.4 ------ UNKNOWN