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: Sun Mar 13 21:59:15 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger668641
======================================================================
Trigger: 00668641 Segment: 000
BAT Trigger Time: 473035650.56 [s; MET]
Trigger Stop: 473035651.584 [s; MET]
UTC: 2015-12-28T22:47:14.940840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.440697667699 Dec: 8.07622585061263 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.83
Image Trigger?: NO
Rate S/N Ratio: 26.2488094968134 [ if not an image trigger ]
Image S/N Ratio: 11.83
Analysis Position: [ source = BAT ]
RA: 344.440697667699 Dec: 8.07622585061263 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 344.425552401874 Dec: 8.08689391021929 [deg; J2000]
{ 22h 57m 42.1s , +08d 05' 12.8" }
+/- 0.895413252274156 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321770474966319 [arcmin] (formal 1-sigma fit error)
SNR: 35.616907779762
Angular difference between the analysis and refined position is 1.104152 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -15.5600000023842
to: 32.4399999976158 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.439999997615814
to: 16.4399999976158 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.93999999761581
to: 8.93999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.5600000023842
to: 48.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.260967 1.614458 1.139745 0.167823
0.049763 0.052782 0.046508 0.039892 [error]
Peak 0.044723 0.065668 0.036422 0.004731
0.006634 0.007329 0.006359 0.004797 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 64.000 -15.560 48.440
T90 48.000 -15.560 32.440
T50 16.000 0.440 16.440
Peak 1.000 7.940 8.940
====== 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: CPL)
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 -1.639 -0.073 0.073 - - - 4.09e-03 -1.68e-04 1.68e-04 62.700 57
CPL -1.101 -0.305 0.327 81.971 -14.574 43.002 7.65e-03 -2.24e-03 3.47e-03 53.170 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 -1.641 -0.223 0.214 - - - 9.56e-03 -1.40e-03 1.37e-03 38.870 57
CPL -0.808 -0.910 1.214 63.662 -17.610 -63.662 2.78e-02 -2.78e-02 1.04e-01 36.600 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 3.81e-07 6.43e-07 8.26e-07 2.13e-06 2.44e-06 3.98e-06 erg/cm2
90%_error_low -2.58e-08 -2.63e-08 -4.55e-08 -2.43e-07 -1.07e-07 -2.80e-07 erg/cm2
90%_error_hi 2.64e-08 2.63e-08 4.54e-08 2.63e-07 1.08e-07 2.96e-07 erg/cm2
Peak flux PL 4.51e-01 4.17e-01 2.68e-01 2.64e-01 1.25e+00 1.40e+00 ph/cm2/s
90%_error_low -8.49e-02 -5.41e-02 -4.98e-02 -8.45e-02 -1.60e-01 -1.87e-01 ph/cm2/s
90%_error_hi 8.82e-02 5.40e-02 4.98e-02 1.05e-01 1.60e-01 1.89e-01 ph/cm2/s
Fluence CPL 3.46e-07 6.74e-07 8.42e-07 9.92e-07 2.32e-06 2.85e-06 erg/cm2
90%_error_low -3.16e-08 -3.17e-08 -4.90e-08 -3.17e-07 -1.24e-07 -3.41e-07 erg/cm2
90%_error_hi 3.21e-08 3.21e-08 4.93e-08 5.03e-07 1.24e-07 5.12e-07 erg/cm2
Peak flux CPL 4.11e-01 4.61e-01 2.74e-01 9.81e-02 1.21e+00 1.24e+00 ph/cm2/s
90%_error_low -9.94e-02 -7.31e-02 -5.79e-02 -9.81e-02 -1.65e-01 -1.83e-01 ph/cm2/s
90%_error_hi 9.98e-02 7.74e-02 5.65e-02 1.98e-01 1.64e-01 2.35e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 344.4256 8.0869 0.0054 1.5943 -86.0699 2.4307202 35.617 TRIG_00668641 Foreground time interval of the image: -15.560 12.741 (delta_t = 28.301 [sec]) Background time interval of the image: -239.560 -15.560 (delta_t = 224.000 [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 -15.560 sec. to 48.440 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63856 ( -0.073149 0.0726004 ) Norm@50keV : 4.09069E-03 ( -0.000168469 0.000167933 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.70 using 59 PHA bins. # Reduced chi-squared = 1.100 for 57 degrees of freedom # Null hypothesis probability = 2.811764e-01 Photon flux (15-150 keV) in 64 sec: 0.532166 ( -0.021703 0.021737 ) ph/cm2/s Energy fluence (15-150 keV) : 2.43809e-06 ( -1.07052e-07 1.07565e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.560 sec. to 48.440 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10105 ( -0.304657 0.327265 ) Epeak [keV] : 81.9709 ( -14.5737 43.0021 ) Norm@50keV : 7.65284E-03 ( -0.00224014 0.00346824 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.17 using 59 PHA bins. # Reduced chi-squared = 0.9494 for 56 degrees of freedom # Null hypothesis probability = 5.828383e-01 Photon flux (15-150 keV) in 64 sec: 0.514680 ( -0.023643 0.023691 ) ph/cm2/s Energy fluence (15-150 keV) : 2.32327e-06 ( -1.2374e-07 1.24383e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.940 sec. to 8.940 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64093 ( -0.223109 0.21401 ) Norm@50keV : 9.56377E-03 ( -0.00139553 0.00136925 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.87 using 59 PHA bins. # Reduced chi-squared = 0.6819 for 57 degrees of freedom # Null hypothesis probability = 9.683306e-01 Photon flux (15-150 keV) in 1 sec: 1.24513 ( -0.16035 0.16037 ) ph/cm2/s Energy fluence (15-150 keV) : 8.9041e-08 ( -1.37297e-08 1.39976e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.940 sec. to 8.940 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.807836 ( -0.909584 1.21445 ) Epeak [keV] : 63.6620 ( -17.6093 -63.6615 ) Norm@50keV : 2.78213E-02 ( -0.027822 0.104274 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.60 using 59 PHA bins. # Reduced chi-squared = 0.6535 for 56 degrees of freedom # Null hypothesis probability = 9.791694e-01 Photon flux (15-150 keV) in 1 sec: 1.21431 ( -0.16491 0.16435 ) ph/cm2/s Energy fluence (15-150 keV) : 8.241e-08 ( -1.50922e-08 1.58439e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 48.0 sec. Hardness ratio (energy fluence ratio) = 1.24959756115
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0202849e-06 S(50-150 keV) = 1.3030068e-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 = 1.907673413937355E-03, IMY = 2.776758531718286E-02
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: -239.560000 -15.560000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5689 35.2196 0.9 49.6 -15.5 6.1785 12.5 1.5 Cyg X-1 308.0290 40.9723 4.3 46.3 -4.6 1.1447 2.7 3.9 Cyg X-3 326.2129 38.4652 9.9 34.4 7.5 -0.3165 -1.2 8.8 Cyg X-2 27.5113 1.2528 3.0 42.2 133.3 2.6371 3.9 ------ UNKNOWN 333.1723 51.5352 2.3 43.9 23.9 2.3180 5.1 ------ UNKNOWN 25.4189 -34.1043 3.2 57.1 176.3 5.1717 3.6 ------ UNKNOWN 14.6873 -32.0209 2.7 49.4 -177.4 2.3405 4.2 ------ UNKNOWN 296.8932 27.0539 2.6 49.6 -26.7 2.2700 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.560000 12.740590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.7021 35.2535 4.0 49.5 -15.4 0.4219 2.9 6.3 Cyg X-1 308.3450 40.9406 0.0 46.1 -4.4 -0.1433 -1.1 10.7 Cyg X-3 326.1761 38.4265 33.3 34.4 7.5 0.0317 0.3 6.3 Cyg X-2 0.0834 0.8462 2.6 16.3 154.0 0.2904 4.4 51.0 UNKNOWN 344.4255 8.0869 0.3 1.6 -86.1 2.4307 35.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 35.540600 962.496500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5942 35.2039 0.6 49.1 -21.9 29.4232 20.4 0.2 Cyg X-1 308.0681 40.9113 2.6 46.0 -10.8 5.4707 4.4 3.1 Cyg X-3 326.1816 38.3158 40.4 34.4 2.0 0.2459 0.3 0.6 Cyg X-2 22.0488 -17.7855 2.4 45.3 152.9 9.9853 4.8 ------ UNKNOWN 5.4677 -6.3874 2.5 25.5 151.8 3.6891 4.7 504.0 UNKNOWN 347.8903 16.7448 2.4 9.3 48.7 2.8883 4.8 ------ UNKNOWN 353.7632 -50.1293 4.6 58.8 -159.2 15.1374 2.5 ------ UNKNOWN 314.1496 -7.1001 3.1 33.8 -88.1 5.5049 3.8 ------ UNKNOWN