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: Tue Jul 16 16:09:01 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger912102
======================================================================
Trigger: 00912102 Segment: 000
BAT Trigger Time: 583567351.808 [s; MET]
Trigger Stop: 583567352.832 [s; MET]
UTC: 2019-06-30T06:02:08.648040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 223.669276535539 Dec: 41.521090175186 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 8.43
Analysis Position: [ source = BAT ]
RA: 223.669276535539 Dec: 41.521090175186 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 223.729332735718 Dec: 41.5283751468225 [deg; J2000]
{ 14h 54m 55.0s , +41d 31' 42.2" }
+/- 1.99097091957556 [arcmin] (estimated 90% radius based on SNR)
+/- 0.980986883506446 [arcmin] (formal 1-sigma fit error)
SNR: 11.3732028368896
Angular difference between the analysis and refined position is 2.732916 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 5.567999958992 +/- 0.902904151689883
Measured from: -1.30400002002716
to: 4.26399993896484 [s; relative to TRIGTIME]
T50: 2.22399985790253 +/- 1.33252846376747
Measured from: -0.115999937057495
to: 2.10799992084503 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.187999963760376
to: 0.812000036239624 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.68400001525879
to: 4.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.129755 0.159399 0.128524 0.033830
0.020681 0.020183 0.018335 0.016303 [error]
Peak 0.027411 0.051677 0.052342 0.004100
0.008494 0.008404 0.007834 0.006599 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.388 -1.684 4.704
T90 5.568 -1.304 4.264
T50 2.224 -0.116 2.108
Peak 1.000 -0.188 0.812
====== 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 -1.356 -0.243 0.242 - - - 4.45e-03 -6.02e-04 5.98e-04 55.670 57
CPL -1.280 -1.363 1.026 446.218 -446.218 -446.218 4.86e-03 -9.94e-04 1.05e-02 55.660 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 -1.056 -0.300 0.311 - - - 9.12e-03 -1.58e-03 1.57e-03 56.120 57
CPL -0.504 -0.702 1.449 156.024 -156.024 -156.024 1.60e-02 -8.14e-03 4.55e-02 55.420 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 3.17e-08 6.37e-08 9.95e-08 3.43e-07 2.77e-07 5.37e-07 erg/cm2
90%_error_low -7.29e-09 -9.07e-09 -1.76e-08 -1.16e-07 -4.24e-08 -1.31e-07 erg/cm2
90%_error_hi 7.76e-09 8.95e-09 1.74e-08 1.52e-07 4.31e-08 1.62e-07 erg/cm2
Peak flux PL 2.46e-01 3.22e-01 3.10e-01 5.30e-01 1.05e+00 1.41e+00 ph/cm2/s
90%_error_low -8.06e-02 -6.92e-02 -5.95e-02 -1.91e-01 -1.86e-01 -2.59e-01 ph/cm2/s
90%_error_hi 9.11e-02 6.77e-02 5.86e-02 2.53e-01 1.87e-01 2.72e-01 ph/cm2/s
Fluence CPL 3.14e-08 6.41e-08 9.99e-08 3.04e-07 2.75e-07 4.99e-07 erg/cm2
90%_error_low -8.75e-09 -9.42e-09 -1.78e-08 -2.26e-07 -4.83e-08 -2.32e-07 erg/cm2
90%_error_hi 6.96e-09 1.10e-08 1.88e-08 7.08e-08 4.44e-08 8.13e-08 erg/cm2
Peak flux CPL 2.12e-01 3.30e-01 3.30e-01 3.19e-01 1.03e+00 1.19e+00 ph/cm2/s
90%_error_low -1.02e-01 -7.48e-02 -7.08e-02 -1.98e-01 -1.94e-01 -2.97e-01 ph/cm2/s
90%_error_hi 1.12e-01 7.54e-02 7.45e-02 2.89e-01 1.94e-01 3.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 223.7293 41.5284 0.0169 8.0325 -123.7017 0.4234625 11.373 TRIG_00912102 Foreground time interval of the image: -1.684 4.704 (delta_t = 6.388 [sec]) Background time interval of the image: -239.808 -1.684 (delta_t = 238.124 [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 -1.684 sec. to 4.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.35645 ( -0.242765 0.241925 ) Norm@50keV : 4.44975E-03 ( -0.000601699 0.000598273 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.67 using 59 PHA bins. # Reduced chi-squared = 0.9767 for 57 degrees of freedom # Null hypothesis probability = 5.249659e-01 Photon flux (15-150 keV) in 6.388 sec: 0.536790 ( -0.071953 0.072088 ) ph/cm2/s Energy fluence (15-150 keV) : 2.77252e-07 ( -4.23996e-08 4.31277e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.684 sec. to 4.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28009 ( -1.36024 1.02859 ) Epeak [keV] : 446.218 ( -501.573 -501.573 ) Norm@50keV : 4.86054E-03 ( -0.000968291 0.0105718 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.66 using 59 PHA bins. # Reduced chi-squared = 0.9939 for 56 degrees of freedom # Null hypothesis probability = 4.876471e-01 Photon flux (15-150 keV) in 6.388 sec: 0.534939 ( -0.075727 0.073343 ) ph/cm2/s Energy fluence (15-150 keV) : 2.75496e-07 ( -4.82611e-08 4.43972e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.188 sec. to 0.812 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05621 ( -0.300107 0.311489 ) Norm@50keV : 9.11900E-03 ( -0.00157506 0.00157093 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.12 using 59 PHA bins. # Reduced chi-squared = 0.9846 for 57 degrees of freedom # Null hypothesis probability = 5.079224e-01 Photon flux (15-150 keV) in 1 sec: 1.05371 ( -0.185775 0.18654 ) ph/cm2/s Energy fluence (15-150 keV) : 9.67275e-08 ( -1.81768e-08 1.8387e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.188 sec. to 0.812 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.503666 ( -0.701673 1.44886 ) Epeak [keV] : 156.024 ( -156.022 -156.022 ) Norm@50keV : 1.59835E-02 ( -0.00814036 0.0455376 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.42 using 59 PHA bins. # Reduced chi-squared = 0.9897 for 56 degrees of freedom # Null hypothesis probability = 4.966320e-01 Photon flux (15-150 keV) in 1 sec: 1.02673 ( -0.194391 0.19428 ) ph/cm2/s Energy fluence (15-150 keV) : 9.40936e-08 ( -1.92284e-08 1.92221e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 5.568 sec. Hardness ratio (energy fluence ratio) = 1.56221200111
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.53967e-08 S(50-150 keV) = 1.8185876e-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 = -7.830236160365243E-02, IMY = 1.174020836367789E-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: -239.808000 -1.684000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2637 35.3324 3.7 16.6 48.7 1.3272 3.1 9.5 Her X-1 299.5251 35.1217 2.2 51.0 23.0 6.9482 5.1 5.8 Cyg X-1 307.9336 40.8700 18.0 54.6 12.9 1.1590 0.6 9.4 Cyg X-3 228.8801 8.9242 4.2 31.1 139.8 1.8837 2.8 ------ UNKNOWN 174.7744 42.4991 2.4 43.8 -116.4 7.6976 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.684000 4.704000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6856 35.2951 7.4 16.9 48.4 -0.0685 -1.6 11.5 Her X-1 299.4925 35.2672 3.1 51.0 22.8 -0.5764 -3.7 6.2 Cyg X-1 308.1682 40.9427 3.8 54.7 12.7 -0.6460 -3.1 2.7 Cyg X-3 223.7293 41.5283 1.0 8.0 -123.7 0.4234 11.4 ------ UNKNOWN 206.3364 23.0035 2.4 28.8 -167.3 0.2104 4.8 ------ UNKNOWN 213.2508 51.5131 1.9 18.6 -93.9 0.2473 5.9 ------ UNKNOWN 176.0822 17.7992 3.3 54.3 -146.3 0.5404 3.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 45.892590 242.392000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3721 35.4435 3.5 24.6 54.0 0.1941 3.3 7.4 Her X-1 239.2333 52.9143 2.1 15.5 -2.9 0.2093 5.5 ------ UNKNOWN 167.5228 22.1076 2.5 50.5 -134.6 0.9007 4.6 ------ UNKNOWN