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: Sat Jan 20 09:51:53 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger796100
======================================================================
Trigger: 00796100 Segment: 000
BAT Trigger Time: 534523596.352 [s; MET]
Trigger Stop: 534523600.448 [s; MET]
UTC: 2017-12-09T14:46:16.223100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 139.381678720042 Dec: -30.5276478397297 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.97
Analysis Position: [ source = BAT ]
RA: 139.381678720042 Dec: -30.5276478397297 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 139.386827755818 Dec: -30.522898752921 [deg; J2000]
{ 09h 17m 32.8s , -30d 31' 22.4" }
+/- 1.22291823167493 [arcmin] (estimated 90% radius based on SNR)
+/- 0.507683091509645 [arcmin] (formal 1-sigma fit error)
SNR: 22.8173352447555
Angular difference between the analysis and refined position is 0.389892 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 161.647999942303 +/- 30.7587722246145
Measured from: -5.2039999961853
to: 156.443999946117 [s; relative to TRIGTIME]
T50: 70.1039999723434 +/- 4.36929745260489
Measured from: 18.5
to: 88.6039999723434 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 79.5159999728203
to: 80.5159999728203 [s; relative to TRIGTIME]
Total Fluence
Measured from: -70.755999982357
to: 228.43599998951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.266617 4.412842 3.281470 0.778833
0.125508 0.131204 0.114638 0.100451 [error]
Peak 0.053189 0.078453 0.046665 0.008595
0.006941 0.007601 0.006712 0.005318 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 299.192 -70.756 228.436
T90 161.648 -5.204 156.444
T50 70.104 18.500 88.604
Peak 1.000 79.516 80.516
====== 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 -1.541 -0.067 0.067 - - - 2.58e-03 -9.18e-05 9.17e-05 58.440 57
CPL -1.432 -0.154 0.228 248.082 -248.082 -248.082 2.91e-03 -6.03e-04 7.25e-04 58.770 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 -1.440 -0.195 0.192 - - - 1.19e-02 -1.41e-03 1.40e-03 47.840 57
CPL -0.993 -0.548 0.947 108.198 -46.077 -108.198 2.05e-02 -9.69e-03 4.33e-02 46.900 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 1.02e-06 1.83e-06 2.52e-06 7.19e-06 7.27e-06 1.26e-05 erg/cm2
90%_error_low -6.82e-08 -7.14e-08 -1.17e-07 -7.22e-07 -2.78e-07 -8.00e-07 erg/cm2
90%_error_hi 6.98e-08 7.11e-08 1.16e-07 7.78e-07 2.79e-07 8.44e-07 erg/cm2
Peak flux PL 4.64e-01 4.84e-01 3.56e-01 4.23e-01 1.47e+00 1.73e+00 ph/cm2/s
90%_error_low -8.47e-02 -5.74e-02 -5.33e-02 -1.15e-01 -1.66e-01 -2.04e-01 ph/cm2/s
90%_error_hi 8.87e-02 5.70e-02 5.29e-02 1.39e-01 1.66e-01 2.07e-01 ph/cm2/s
Fluence CPL 1.01e-06 1.84e-06 2.53e-06 6.60e-06 7.23e-06 1.20e-05 erg/cm2
90%_error_low -8.44e-08 -7.38e-08 -1.19e-07 -2.07e-06 -3.02e-07 -2.09e-06 erg/cm2
90%_error_hi 7.09e-08 8.02e-08 1.24e-07 7.38e-07 2.87e-07 8.62e-07 erg/cm2
Peak flux CPL 4.34e-01 5.08e-01 3.67e-01 2.45e-01 1.44e+00 1.55e+00 ph/cm2/s
90%_error_low -1.00e-01 -7.08e-02 -5.79e-02 -1.50e-01 -1.73e-01 -2.38e-01 ph/cm2/s
90%_error_hi 1.02e-01 7.45e-02 5.95e-02 2.20e-01 1.72e-01 2.97e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 139.3868 -30.5229 0.0085 31.4838 25.8353 4.7420407 22.817 TRIG_00796100 Foreground time interval of the image: -70.756 36.749 (delta_t = 107.505 [sec]) Background time interval of the image: -239.352 -70.756 (delta_t = 168.596 [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 -70.756 sec. to 228.436 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5411 ( -0.0673306 0.0672311 ) Norm@50keV : 2.57653E-03 ( -9.18242e-05 9.16898e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.44 using 59 PHA bins. # Reduced chi-squared = 1.025 for 57 degrees of freedom # Null hypothesis probability = 4.221448e-01 Photon flux (15-150 keV) in 299.2 sec: 0.325349 ( -0.012267 0.01231 ) ph/cm2/s Energy fluence (15-150 keV) : 7.2676e-06 ( -2.78332e-07 2.79354e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -70.756 sec. to 228.436 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48523 ( -0.102274 0.279627 ) Epeak [keV] : 469.016 ( -482.532 -482.532 ) Norm@50keV : 2.74269E-03 ( -0.000434642 0.000893344 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.31 using 59 PHA bins. # Reduced chi-squared = 1.041 for 56 degrees of freedom # Null hypothesis probability = 3.905639e-01 Photon flux (15-150 keV) in 299.2 sec: 0.324141 ( -0.013374 0.006715 ) ph/cm2/s Energy fluence (15-150 keV) : 7.23439e-06 ( -3.0218e-07 2.8741e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 79.516 sec. to 80.516 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44024 ( -0.194826 0.191837 ) Norm@50keV : 1.19317E-02 ( -0.0014136 0.00140137 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.84 using 59 PHA bins. # Reduced chi-squared = 0.8393 for 57 degrees of freedom # Null hypothesis probability = 8.010027e-01 Photon flux (15-150 keV) in 1 sec: 1.46692 ( -0.16637 0.16643 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14401e-07 ( -1.50985e-08 1.5302e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 79.516 sec. to 80.516 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.992719 ( -0.547402 0.94697 ) Epeak [keV] : 108.198 ( -46.1001 -108.221 ) Norm@50keV : 2.05166E-02 ( -0.00968408 0.0433367 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.90 using 59 PHA bins. # Reduced chi-squared = 0.8375 for 56 degrees of freedom # Null hypothesis probability = 8.017112e-01 Photon flux (15-150 keV) in 1 sec: 1.44323 ( -0.17273 0.17175 ) ph/cm2/s Energy fluence (15-150 keV) : 1.09959e-07 ( -1.73443e-08 1.71452e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 161.648 sec. Hardness ratio (energy fluence ratio) = 1.37454808072
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.856353e-06 S(50-150 keV) = 4.411297e-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 = 5.512023442474684E-01, IMY = -2.668801861278758E-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: -239.352000 -70.756000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5297 -40.7496 171.0 39.7 13.9 -0.0179 -0.1 11.7 Vela X-1 170.3707 -60.6066 6.2 48.1 -26.9 0.6900 1.9 1.9 Cen X-3 186.5721 -62.8162 2.9 52.1 -35.9 2.8176 3.9 3.6 GX 301-2 156.6379 35.7167 2.2 49.3 143.6 4.6091 5.1 ------ UNKNOWN 188.1744 1.7534 2.6 25.1 -148.2 0.8783 4.4 ------ UNKNOWN 194.7405 -1.4848 2.3 29.3 -134.9 1.1028 5.1 ------ UNKNOWN 208.3997 28.3111 2.9 56.9 -161.3 4.1173 4.0 ------ UNKNOWN 204.9182 -39.1996 2.2 42.5 -69.2 3.8853 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -70.756000 36.748590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5142 -40.4060 34.3 39.5 14.3 -0.0807 -0.3 8.9 Vela X-1 170.3076 -60.7217 10.6 48.2 -26.8 -0.3470 -1.1 5.9 Cen X-3 186.3357 -62.8258 3.9 52.1 -35.7 -1.9399 -3.0 9.4 GX 301-2 139.3868 -30.5229 0.5 31.5 25.8 4.7413 22.8 ------ UNKNOWN 189.5588 33.8823 2.2 51.0 178.9 2.3199 5.2 ------ UNKNOWN 143.9417 -56.2149 1.7 47.3 -7.4 1.8964 6.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 88.348620 482.687200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4597 -40.5459 2.3 10.5 -17.1 2.9467 5.0 3.2 Vela X-1 170.5676 -60.6211 13.6 36.5 -59.0 1.0258 0.8 7.4 Cen X-3 186.5890 -62.6561 3.0 43.9 -62.8 10.8899 3.8 7.1 GX 301-2 149.6478 20.8266 2.5 52.3 158.5 13.0599 4.7 ------ UNKNOWN 152.9892 22.7919 2.8 54.9 161.7 15.0217 4.1 ------ UNKNOWN 79.3791 -48.6969 3.3 48.3 16.3 4.7672 3.5 ------ UNKNOWN 139.3360 -30.5277 2.2 0.0 69.1 3.1310 5.3 ------ UNKNOWN 157.3476 -5.6528 2.7 30.1 -175.9 2.8282 4.3 ------ UNKNOWN 164.1295 -49.6960 3.2 26.7 -70.8 2.9952 3.5 ------ UNKNOWN 68.0953 -78.4186 2.2 56.4 -20.5 12.9734 5.2 ------ UNKNOWN 160.6256 -74.9883 2.6 45.7 -41.2 5.8428 4.5 ------ UNKNOWN 186.6108 -11.1897 3.3 47.7 -137.1 7.1134 3.5 ------ UNKNOWN