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: Wed Apr 12 14:46:21 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger742866
======================================================================
Trigger: 00742866 Segment: 000
BAT Trigger Time: 511436777.856 [s; MET]
Trigger Stop: 511436778.88 [s; MET]
UTC: 2017-03-17T09:45:59.089020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 93.0878746012199 Dec: 50.5203503865234 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 7.39
Analysis Position: [ source = BAT ]
RA: 93.0878746012199 Dec: 50.5203503865234 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 93.0871389875097 Dec: 50.5001270349614 [deg; J2000]
{ 06h 12m 20.9s , +50d 30' 00.5" }
+/- 0.978125551472616 [arcmin] (estimated 90% radius based on SNR)
+/- 0.360556234827946 [arcmin] (formal 1-sigma fit error)
SNR: 31.393546054237
Angular difference between the analysis and refined position is 1.213726 arcmin
Partial Coding Fraction: 0.4609375 [ including projection effects ]
Duration
T90: 11.9520000219345 +/- 4.87496137879083
Measured from: 0.431999981403351
to: 12.3840000033379 [s; relative to TRIGTIME]
T50: 4.28800004720688 +/- 0.729712276663801
Measured from: 1.98399996757507
to: 6.27200001478195 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.283999979496
to: 2.283999979496 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.287999987602234
to: 18.3199999928474 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.659366 0.969306 0.591819 0.115746
0.045906 0.047870 0.040598 0.033148 [error]
Peak 0.108623 0.151595 0.121284 0.039228
0.011788 0.013504 0.011348 0.008645 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 18.608 -0.288 18.320
T90 11.952 0.432 12.384
T50 4.288 1.984 6.272
Peak 1.000 1.284 2.284
====== 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: 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 -1.778 -0.105 0.103 - - - 8.35e-03 -5.42e-04 5.38e-04 89.000 57
CPL -0.806 -0.463 0.518 58.657 -7.488 13.570 2.68e-02 -1.12e-02 2.26e-02 74.690 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 -1.529 -0.153 0.151 - - - 2.80e-02 -2.63e-03 2.62e-03 63.030 57
CPL -1.220 -0.390 0.594 130.310 -58.408 -130.310 4.01e-02 -1.34e-02 3.76e-02 62.060 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 2.58e-07 4.00e-07 4.66e-07 1.05e-06 1.43e-06 2.17e-06 erg/cm2
90%_error_low -2.44e-08 -2.45e-08 -3.98e-08 -1.73e-07 -9.49e-08 -2.12e-07 erg/cm2
90%_error_hi 2.50e-08 2.45e-08 3.98e-08 1.94e-07 9.54e-08 2.27e-07 erg/cm2
Peak flux PL 1.19e+00 1.17e+00 8.14e-01 8.91e-01 3.53e+00 4.07e+00 ph/cm2/s
90%_error_low -1.81e-01 -1.16e-01 -9.34e-02 -1.90e-01 -3.33e-01 -3.75e-01 ph/cm2/s
90%_error_hi 1.88e-01 1.15e-01 9.24e-02 2.17e-01 3.33e-01 3.76e-01 ph/cm2/s
Fluence CPL 2.22e-07 4.41e-07 4.83e-07 3.12e-07 1.34e-06 1.46e-06 erg/cm2
90%_error_low -2.91e-08 -3.13e-08 -4.56e-08 -1.25e-07 -1.02e-07 -1.61e-07 erg/cm2
90%_error_hi 2.96e-08 3.20e-08 4.55e-08 2.14e-07 1.04e-07 2.29e-07 erg/cm2
Peak flux CPL 1.12e+00 1.21e+00 8.43e-01 6.40e-01 3.50e+00 3.82e+00 ph/cm2/s
90%_error_low -2.12e-01 -1.33e-01 -1.06e-01 -2.78e-01 -3.38e-01 -4.50e-01 ph/cm2/s
90%_error_hi 2.16e-01 1.37e-01 1.08e-01 3.27e-01 3.38e-01 5.04e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 93.0871 50.5001 0.0062 37.6216 23.6984 2.2599654 31.394 TRIG_00742866 Foreground time interval of the image: -0.288 10.645 (delta_t = 10.933 [sec]) Background time interval of the image: -239.856 -0.288 (delta_t = 239.568 [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 -0.288 sec. to 18.320 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77793 ( -0.105205 0.103398 ) Norm@50keV : 8.34702E-03 ( -0.00054169 0.000538366 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 89.00 using 59 PHA bins. # Reduced chi-squared = 1.561 for 57 degrees of freedom # Null hypothesis probability = 4.277636e-03 Photon flux (15-150 keV) in 18.61 sec: 1.14056 ( -0.07093 0.07106 ) ph/cm2/s Energy fluence (15-150 keV) : 1.43158e-06 ( -9.49358e-08 9.54442e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 18.320 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.805878 ( -0.463403 0.518114 ) Epeak [keV] : 58.6571 ( -7.48751 13.5702 ) Norm@50keV : 2.67747E-02 ( -0.0112303 0.0226151 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.69 using 59 PHA bins. # Reduced chi-squared = 1.334 for 56 degrees of freedom # Null hypothesis probability = 4.821568e-02 Photon flux (15-150 keV) in 18.61 sec: 1.09091 ( -0.0743 0.07444 ) ph/cm2/s Energy fluence (15-150 keV) : 1.33926e-06 ( -1.02445e-07 1.03835e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.284 sec. to 2.284 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52869 ( -0.152688 0.151273 ) Norm@50keV : 2.80490E-02 ( -0.00262695 0.00261717 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.03 using 59 PHA bins. # Reduced chi-squared = 1.106 for 57 degrees of freedom # Null hypothesis probability = 2.715727e-01 Photon flux (15-150 keV) in 1 sec: 3.52943 ( -0.33309 0.33349 ) ph/cm2/s Energy fluence (15-150 keV) : 2.64923e-07 ( -2.66033e-08 2.6719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.284 sec. to 2.284 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21975 ( -0.389549 0.593564 ) Epeak [keV] : 130.310 ( -58.4087 -130.31 ) Norm@50keV : 4.00699E-02 ( -0.0133841 0.0375845 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.06 using 59 PHA bins. # Reduced chi-squared = 1.108 for 56 degrees of freedom # Null hypothesis probability = 2.690620e-01 Photon flux (15-150 keV) in 1 sec: 3.49790 ( -0.338 0.33802 ) ph/cm2/s Energy fluence (15-150 keV) : 2.6124e-07 ( -2.762e-08 2.75552e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 7.057130101787701E-01, IMY = -3.097634749074601E-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: -239.856000 -0.288000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6305 22.0200 0.3 12.3 65.4 9.8883 40.9 0.4 Crab 72.9621 -39.6594 2.1 56.7 -179.7 8.2054 5.4 ------ UNKNOWN 60.6543 -37.8315 2.1 55.8 -168.0 5.9347 5.4 ------ UNKNOWN 44.7448 -21.5185 2.7 46.7 -143.2 2.8189 4.2 ------ UNKNOWN 24.9123 31.9870 2.9 44.8 -60.0 5.2839 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.288000 10.644600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.8001 22.1532 0.0 12.5 65.1 0.0759 1.7 12.5 Crab 93.0871 50.5001 0.4 37.6 23.7 2.2601 31.4 ------ UNKNOWN 84.1865 13.9550 2.2 12.4 103.9 0.2303 5.2 ------ UNKNOWN 73.6108 19.3478 2.4 3.0 38.4 0.2046 4.8 ------ UNKNOWN 49.9604 -17.4049 2.2 40.5 -145.6 0.4165 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 67.244590 962.217300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6436 22.0125 0.2 29.5 -165.6 35.8694 53.0 0.6 Crab 267.7833 74.7541 3.0 54.7 -1.9 8.9593 3.9 ------ UNKNOWN 67.7998 43.1098 2.6 18.7 -107.2 3.1211 4.5 ------ UNKNOWN 66.7351 -0.6561 3.5 55.9 -151.2 12.6974 3.3 ------ UNKNOWN 44.9674 37.4731 3.3 36.2 -95.7 6.6606 3.5 ------ UNKNOWN