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: Thu May 31 13:15:07 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger832368
======================================================================
Trigger: 00832368 Segment: 000
BAT Trigger Time: 547997154.432 [s; MET]
Trigger Stop: 547997156.48 [s; MET]
UTC: 2018-05-14T13:25:33.490260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 197.400829211167 Dec: 36.9695482478951 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.83
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 7.83
Analysis Position: [ source = BAT ]
RA: 197.400829211167 Dec: 36.9695482478951 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 197.384564570651 Dec: 36.9706469279382 [deg; J2000]
{ 13h 09m 32.3s , +36d 58' 14.3" }
+/- 1.29094113469072 [arcmin] (estimated 90% radius based on SNR)
+/- 0.448750463360856 [arcmin] (formal 1-sigma fit error)
SNR: 21.1193530046473
Angular difference between the analysis and refined position is 0.782459 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 31.1599999666214 +/- 4.10507831355118
Measured from: -6.5440000295639
to: 24.6159999370575 [s; relative to TRIGTIME]
T50: 15.6480000019073 +/- 2.21677241539886
Measured from: 0.867999911308289
to: 16.5159999132156 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.291999936103821
to: 1.29199993610382 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.36000001430511
to: 28.5999999046326 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.557049 0.623724 0.372586 0.045441
0.037852 0.039297 0.033726 0.028243 [error]
Peak 0.035659 0.028810 0.025377 0.007223
0.006463 0.006628 0.005829 0.004872 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 36.960 -8.360 28.600
T90 31.160 -6.544 24.616
T50 15.648 0.868 16.516
Peak 1.000 0.292 1.292
====== 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 -1.746 -0.131 0.128 - - - 2.64e-03 -2.13e-04 2.11e-04 57.470 57
CPL -1.268 -0.516 0.597 68.379 -17.858 -68.379 4.84e-03 -2.26e-03 5.38e-03 55.020 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 -1.754 -0.393 0.363 - - - 5.43e-03 -1.35e-03 1.29e-03 49.440 57
CPL -1.741 -1.050 1.428 801.898 -801.888 -801.898 5.52e-03 -1.45e-03 3.20e-02 49.440 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 1.57e-07 2.49e-07 2.96e-07 6.88e-07 9.01e-07 1.39e-06 erg/cm2
90%_error_low -1.72e-08 -1.77e-08 -3.23e-08 -1.43e-07 -7.51e-08 -1.76e-07 erg/cm2
90%_error_hi 1.76e-08 1.77e-08 3.25e-08 1.66e-07 7.61e-08 1.94e-07 erg/cm2
Peak flux PL 2.85e-01 2.47e-01 1.46e-01 1.30e-01 7.35e-01 8.09e-01 ph/cm2/s
90%_error_low -8.32e-02 -5.00e-02 -4.67e-02 -6.62e-02 -1.49e-01 -1.70e-01 ph/cm2/s
90%_error_hi 8.72e-02 5.00e-02 4.73e-02 9.80e-02 1.49e-01 1.72e-01 ph/cm2/s
Fluence CPL 1.49e-07 2.63e-07 2.96e-07 3.11e-07 8.57e-07 1.02e-06 erg/cm2
90%_error_low -1.98e-08 -2.33e-08 -3.55e-08 -1.70e-07 -8.77e-08 -1.93e-07 erg/cm2
90%_error_hi 1.98e-08 2.40e-08 3.49e-08 4.18e-07 8.92e-08 4.28e-07 erg/cm2
Peak flux CPL 2.85e-01 2.47e-01 1.46e-01 1.28e-01 7.34e-01 8.06e-01 ph/cm2/s
90%_error_low N/A -5.03e-02 -4.59e-02 -1.28e-01 -1.51e-01 -2.04e-01 ph/cm2/s
90%_error_hi N/A 6.55e-02 4.85e-02 5.70e-02 1.49e-01 1.68e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 197.3846 36.9706 0.0091 15.6440 47.0382 1.5743042 21.119 TRIG_00832368 Foreground time interval of the image: -8.360 28.600 (delta_t = 36.960 [sec]) Background time interval of the image: -657.231 -643.404 (delta_t = 13.828 [sec]) -239.432 -8.360 (delta_t = 231.072 [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 -8.360 sec. to 28.600 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.74574 ( -0.131162 0.128477 ) Norm@50keV : 2.64188E-03 ( -0.000213084 0.000210625 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.47 using 59 PHA bins. # Reduced chi-squared = 1.008 for 57 degrees of freedom # Null hypothesis probability = 4.574790e-01 Photon flux (15-150 keV) in 36.96 sec: 0.356684 ( -0.025593 0.025606 ) ph/cm2/s Energy fluence (15-150 keV) : 9.01347e-07 ( -7.51153e-08 7.61195e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.360 sec. to 28.600 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.26751 ( -0.516255 0.596717 ) Epeak [keV] : 68.3793 ( -17.8582 -68.3793 ) Norm@50keV : 4.84475E-03 ( -0.00226496 0.00538008 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.02 using 59 PHA bins. # Reduced chi-squared = 0.9825 for 56 degrees of freedom # Null hypothesis probability = 5.120749e-01 Photon flux (15-150 keV) in 36.96 sec: 0.349020 ( -0.02698 0.026884 ) ph/cm2/s Energy fluence (15-150 keV) : 8.57298e-07 ( -8.76684e-08 8.92048e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.292 sec. to 1.292 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.75359 ( -0.392687 0.362931 ) Norm@50keV : 5.42522E-03 ( -0.00135494 0.00129461 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.44 using 59 PHA bins. # Reduced chi-squared = 0.8673 for 57 degrees of freedom # Null hypothesis probability = 7.514427e-01 Photon flux (15-150 keV) in 1 sec: 0.734589 ( -0.148766 0.148768 ) ph/cm2/s Energy fluence (15-150 keV) : 5.00587e-08 ( -1.24845e-08 1.29746e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.292 sec. to 1.292 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7409 ( -1.05029 1.428 ) Epeak [keV] : 801.898 ( -894.124 -894.134 ) Norm@50keV : 5.51814E-03 ( -0.00144527 0.0320243 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.44 using 59 PHA bins. # Reduced chi-squared = 0.8828 for 56 degrees of freedom # Null hypothesis probability = 7.198564e-01 Photon flux (15-150 keV) in 1 sec: 0.734298 ( -0.150589 0.149018 ) ph/cm2/s Energy fluence (15-150 keV) : 4.99839e-08 ( -1.42903e-08 1.08576e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 31.16 sec. Hardness ratio (energy fluence ratio) = 1.19275153518
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.056532e-07 S(50-150 keV) = 4.957065e-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 = 1.908452745266090E-01, IMY = -2.049304000518498E-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: -657.231410 -643.403600 -239.432000 -8.360000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 201.5431 4.2131 3.3 40.9 98.2 3.5463 3.6 ------ UNKNOWN 174.7324 21.2045 2.0 17.8 145.2 1.1532 5.7 ------ UNKNOWN 120.7975 27.9075 2.2 47.9 -129.0 5.3238 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.360000 28.600000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 197.3846 36.9706 0.5 15.6 47.0 1.5744 21.1 ------ UNKNOWN 262.2776 68.8225 2.2 52.3 -16.7 0.9669 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 66.868590 962.718600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3553 35.4343 21.2 45.3 20.1 0.6038 0.5 7.4 Her X-1 215.2220 -0.3716 3.3 40.8 98.2 8.1671 3.5 ------ UNKNOWN 189.5543 -3.0865 2.3 40.7 138.2 7.0190 5.0 ------ UNKNOWN 232.1036 39.6414 3.2 27.2 19.8 2.0851 3.6 ------ UNKNOWN 276.4572 47.6576 3.8 56.9 -1.7 7.9561 3.0 ------ UNKNOWN 143.6725 10.7124 2.9 54.8 -158.1 9.5664 4.0 ------ UNKNOWN 157.4111 50.8047 3.6 31.5 -105.0 3.2032 3.2 ------ UNKNOWN 152.7710 69.0212 4.8 40.1 -76.9 5.8557 2.4 ------ UNKNOWN 137.6944 33.6866 3.6 48.0 -129.0 9.0523 3.2 ------ UNKNOWN