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 v2.47
Process Start Time: Mon May 18 14:48:08 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger956639
======================================================================
Trigger: 00956639 Segment: 000
BAT Trigger Time: 603470396.416 [s; MET]
Trigger Stop: 603470397.44 [s; MET]
UTC: 2020-02-15T14:39:31.975900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.1217781187011 Dec: 12.7806238069698 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.49
Image Trigger?: NO
Rate S/N Ratio: 37.1214223865412 [ if not an image trigger ]
Image S/N Ratio: 16.49
Analysis Position: [ source = BAT ]
RA: 34.1217781187011 Dec: 12.7806238069698 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 34.0999775945519 Dec: 12.7753599537487 [deg; J2000]
{ 02h 16m 24.0s , +12d 46' 31.3" }
+/- 0.981626090769389 [arcmin] (estimated 90% radius based on SNR)
+/- 0.35363813512322 [arcmin] (formal 1-sigma fit error)
SNR: 31.2337378847574
Angular difference between the analysis and refined position is 1.314154 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 11.1479998826981 +/- 2.15453477136577
Measured from: -7.33599996566772
to: 3.81199991703033 [s; relative to TRIGTIME]
T50: 3.70799994468689 +/- 0.627910734101116
Measured from: -2.08800005912781
to: 1.61999988555908 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.159999966621399
to: 0.840000033378601 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.97200000286102
to: 5.36800003051758 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.406933 0.658523 0.511084 0.128731
0.029439 0.031156 0.027983 0.023393 [error]
Peak 0.071393 0.120292 0.112172 0.043061
0.008417 0.009415 0.009068 0.007147 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 15.340 -9.972 5.368
T90 11.148 -7.336 3.812
T50 3.708 -2.088 1.620
Peak 1.000 -0.160 0.840
====== 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 -1.406 -0.094 0.094 - - - 7.59e-03 -4.11e-04 4.11e-04 62.570 57
CPL -1.054 -0.352 0.386 140.810 -48.213 858.831 1.13e-02 -3.53e-03 5.85e-03 59.670 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 -1.209 -0.140 0.141 - - - 2.33e-02 -1.90e-03 1.90e-03 46.440 57
CPL -1.060 -0.273 0.566 344.871 -344.871 -344.871 2.74e-02 -5.78e-03 2.24e-02 46.200 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 1.36e-07 2.65e-07 4.00e-07 1.31e-06 1.12e-06 2.11e-06 erg/cm2
90%_error_low -1.32e-08 -1.58e-08 -2.69e-08 -1.83e-07 -6.63e-08 -2.03e-07 erg/cm2
90%_error_hi 1.36e-08 1.57e-08 2.68e-08 2.02e-07 6.66e-08 2.19e-07 erg/cm2
Peak flux PL 7.25e-01 8.68e-01 7.51e-01 1.11e+00 2.74e+00 3.46e+00 ph/cm2/s
90%_error_low -1.10e-01 -8.32e-02 -7.13e-02 -2.07e-01 -2.29e-01 -2.96e-01 ph/cm2/s
90%_error_hi 1.16e-01 8.22e-02 7.06e-02 2.35e-01 2.29e-01 3.00e-01 ph/cm2/s
Fluence CPL 1.27e-07 2.74e-07 4.12e-07 7.98e-07 1.10e-06 1.61e-06 erg/cm2
90%_error_low -1.58e-08 -1.82e-08 -2.98e-08 -2.97e-07 -7.18e-08 -3.02e-07 erg/cm2
90%_error_hi 1.61e-08 1.85e-08 3.02e-08 5.09e-07 7.15e-08 5.06e-07 erg/cm2
Peak flux CPL 7.02e-01 8.79e-01 7.65e-01 9.41e-01 2.72e+00 3.29e+00 ph/cm2/s
90%_error_low -1.35e-01 -4.57e-02 -8.11e-02 -4.02e-01 -2.34e-01 -4.73e-01 ph/cm2/s
90%_error_hi 1.24e-01 9.26e-02 8.58e-02 2.29e-01 2.34e-01 4.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 34.1000 12.7754 0.0062 34.0530 -167.7735 1.7727986 31.234 TRIG_00956639 Foreground time interval of the image: -9.972 5.368 (delta_t = 15.340 [sec]) Background time interval of the image: -239.416 -9.972 (delta_t = 229.444 [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 -9.972 sec. to 5.368 sec. XSPEC12>exit XSPEC: quit Photon index: -1.40624 ( -0.0942883 0.0943835 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.40624 ( -0.0943835 0.0942883 ) Norm@50keV : 7.59002E-03 ( -0.000411398 0.000411183 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 15.34 sec: 0.925658 ( -0.052096 0.052182 ) ph/cm2/s Energy fluence (15-150 keV) : 1.12374e-06 ( -6.63002e-08 6.66126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.972 sec. to 5.368 sec. XSPEC: quit Photon index: -1.05405 ( -0.352242 0.385783 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.05405 ( -0.385783 0.352242 ) Epeak [keV] : 140.810 ( -48.2124 858.832 ) Norm@50keV : 1.12564E-02 ( -0.00352904 0.00585461 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 15.34 sec: 0.910541 ( -0.054199 0.054242 ) ph/cm2/s Energy fluence (15-150 keV) : 1.09839e-06 ( -7.17536e-08 7.15309e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.160 sec. to 0.840 sec. XSPEC12>exit XSPEC: quit Photon index: -1.20906 ( -0.140062 0.141248 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.20906 ( -0.141248 0.140062 ) Norm@50keV : 2.32833E-02 ( -0.0018952 0.00189519 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 2.73654 ( -0.22919 0.22946 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35646e-07 ( -2.12286e-08 2.13522e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.160 sec. to 0.840 sec. XSPEC: quit Photon index: -1.06037 ( -0.272972 0.56581 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.06037 ( -0.56581 0.272972 ) Epeak [keV] : 344.871 ( -344.871 -344.871 ) Norm@50keV : 2.73918E-02 ( -0.00578105 0.0223757 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 2.72262 ( -0.23426 0.23426 ) ph/cm2/s Energy fluence (15-150 keV) : 2.339e-07 ( -2.23417e-08 2.20705e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.148 sec. Hardness ratio (energy fluence ratio) = 1.50921116585
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.011648e-07 S(50-150 keV) = 7.225915e-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 = -6.605268263684679E-01, IMY = 1.431301994029492E-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: -239.416000 -9.972000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1098 40.9493 37.5 49.9 -25.9 0.1649 0.3 0.2 Cyg X-3 326.3518 38.3573 48.7 38.4 -38.1 0.0868 0.2 8.7 Cyg X-2 12.7250 70.7380 2.3 27.1 38.2 1.2780 4.9 ------ UNKNOWN 18.1793 48.0430 3.1 4.3 46.3 0.7086 3.8 ------ UNKNOWN 299.2486 45.5885 2.2 53.4 -16.8 3.0479 5.4 ------ UNKNOWN 323.9651 25.2605 2.7 47.0 -53.1 3.9126 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.972000 5.368000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 307.9966 40.9909 6.9 50.0 -25.8 -0.2030 -1.7 5.6 Cyg X-3 326.1800 38.3187 271.2 38.6 -38.1 -0.0033 -0.0 0.4 Cyg X-2 223.7010 86.2140 3.3 49.7 39.6 0.8486 3.5 ------ UNKNOWN 34.1000 12.7754 0.4 34.1 -167.8 1.7727 31.2 ------ UNKNOWN 38.9565 -7.2518 2.4 54.5 -164.5 0.9037 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.284600 962.695400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 47.2085 -19.9463 2.9 35.2 177.4 3.8227 4.0 ------ UNKNOWN 29.2327 -19.5667 3.7 32.7 -152.4 2.7484 3.2 ------ UNKNOWN 22.1264 -24.0181 3.1 38.6 -143.2 4.4932 3.7 ------ UNKNOWN 7.8177 -27.8986 2.5 48.0 -129.1 13.8982 4.7 ------ UNKNOWN 9.5078 -30.9406 2.4 49.7 -133.0 18.3590 4.8 ------ UNKNOWN