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 Jan 22 21:43:35 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger145675
======================================================================
Trigger: 00145675 Segment: 000
BAT Trigger Time: 142921742.016 [s; MET]
Trigger Stop: 142921742.528 [s; MET]
UTC: 2005-07-13T04:29:02.396820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 320.536539185524 Dec: 77.0721719432608 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.32
Image Trigger?: NO
Rate S/N Ratio: 31.2729915422238 [ if not an image trigger ]
Image S/N Ratio: 11.32
Analysis Position: [ source = BAT ]
RA: 320.536539185524 Dec: 77.0721719432608 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 320.56737432516 Dec: 77.0719723903794 [deg; J2000]
{ 21h 22m 16.2s , +77d 04' 19.1" }
+/- 1.06397059669473 [arcmin] (estimated 90% radius based on SNR)
+/- 0.345355816260137 [arcmin] (formal 1-sigma fit error)
SNR: 27.8386060603808
Angular difference between the analysis and refined position is 0.414089 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 124.67199999094 +/- 62.407646704848
Measured from: -52.7439999878407
to: 71.9280000030994 [s; relative to TRIGTIME]
T50: 10.5600000023842 +/- 1.39778108223621
Measured from: 2.87200000882149
to: 13.4320000112057 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.06000000238419
to: 2.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -69.3840000033379
to: 121.33599999547 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.241787 2.883991 2.394183 0.690508
0.092815 0.097730 0.086758 0.075941 [error]
Peak 0.110138 0.210724 0.169536 0.074298
0.011133 0.012580 0.011785 0.009701 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 190.720 -69.384 121.336
T90 124.672 -52.744 71.928
T50 10.560 2.872 13.432
Peak 1.000 1.060 2.060
====== 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 -1.529 -0.072 0.072 - - - 2.85e-03 -1.09e-04 1.09e-04 54.870 57
CPL -1.405 -0.160 0.282 252.625 -252.625 -252.625 3.27e-03 -5.05e-04 1.15e-03 54.250 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 -1.234 -0.120 0.121 - - - 3.82e-02 -2.59e-03 2.59e-03 66.730 57
CPL -1.176 -0.168 0.475 752.779 -752.779 -752.779 4.08e-02 -4.81e-03 2.75e-02 66.680 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 7.13e-07 1.29e-06 1.78e-06 5.15e-06 5.13e-06 8.93e-06 erg/cm2
90%_error_low -5.09e-08 -5.40e-08 -8.84e-08 -5.51e-07 -2.12e-07 -6.10e-07 erg/cm2
90%_error_hi 5.22e-08 5.38e-08 8.81e-08 5.96e-07 2.12e-07 6.46e-07 erg/cm2
Peak flux PL 1.22e+00 1.44e+00 1.22e+00 1.77e+00 4.51e+00 5.65e+00 ph/cm2/s
90%_error_low -1.57e-01 -1.14e-01 -9.80e-02 -2.85e-01 -3.14e-01 -4.02e-01 ph/cm2/s
90%_error_hi 1.63e-01 1.13e-01 9.72e-02 3.18e-01 3.14e-01 4.06e-01 ph/cm2/s
Fluence CPL 6.94e-07 1.30e-06 1.80e-06 4.29e-06 5.08e-06 8.08e-06 erg/cm2
90%_error_low -6.36e-08 -5.84e-08 -9.45e-08 -1.36e-06 -2.37e-07 -1.38e-06 erg/cm2
90%_error_hi 5.89e-08 6.05e-08 9.57e-08 1.41e-06 2.31e-07 1.08e-06 erg/cm2
Peak flux CPL 1.21e+00 1.45e+00 1.23e+00 1.83e+00 4.50e+00 5.53e+00 ph/cm2/s
90%_error_low -1.89e-01 -1.19e-01 -1.04e-01 -8.76e-01 -3.25e-01 -7.56e-01 ph/cm2/s
90%_error_hi 1.53e-01 1.28e-01 1.13e-01 1.30e-01 3.17e-01 4.95e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 320.5674 77.0720 0.0069 32.9653 114.3292 5.0628015 27.839 TRIG_00145675 Foreground time interval of the image: -69.384 9.485 (delta_t = 78.869 [sec]) Background time interval of the image: -244.315 -69.384 (delta_t = 174.931 [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 -69.384 sec. to 121.336 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52889 ( -0.071837 0.0716782 ) Norm@50keV : 2.84867E-03 ( -0.000109224 0.000109067 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.87 using 59 PHA bins. # Reduced chi-squared = 0.9626 for 57 degrees of freedom # Null hypothesis probability = 5.555126e-01 Photon flux (15-150 keV) in 190.7 sec: 0.358470 ( -0.014522 0.014576 ) ph/cm2/s Energy fluence (15-150 keV) : 5.13075e-06 ( -2.11587e-07 2.12323e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -69.384 sec. to 121.336 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40526 ( -0.159753 0.282257 ) Epeak [keV] : 252.625 ( -252.618 -252.618 ) Norm@50keV : 3.26543E-03 ( -0.000504689 0.0011549 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.25 using 59 PHA bins. # Reduced chi-squared = 0.9688 for 56 degrees of freedom # Null hypothesis probability = 5.412890e-01 Photon flux (15-150 keV) in 190.7 sec: 0.355522 ( -0.015797 0.015786 ) ph/cm2/s Energy fluence (15-150 keV) : 5.08231e-06 ( -2.36561e-07 2.31069e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.060 sec. to 2.060 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23367 ( -0.119777 0.120659 ) Norm@50keV : 3.82497E-02 ( -0.00258645 0.00258622 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.73 using 59 PHA bins. # Reduced chi-squared = 1.171 for 57 degrees of freedom # Null hypothesis probability = 1.772949e-01 Photon flux (15-150 keV) in 1 sec: 4.51221 ( -0.31409 0.31447 ) ph/cm2/s Energy fluence (15-150 keV) : 3.84512e-07 ( -2.90035e-08 2.91923e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.060 sec. to 2.060 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17551 ( -0.16768 0.474647 ) Epeak [keV] : 752.779 ( -753.484 -753.484 ) Norm@50keV : 4.08123E-02 ( -0.00480845 0.0274934 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.68 using 59 PHA bins. # Reduced chi-squared = 1.191 for 56 degrees of freedom # Null hypothesis probability = 1.554199e-01 Photon flux (15-150 keV) in 1 sec: 4.50127 ( -0.32458 0.31715 ) ph/cm2/s Energy fluence (15-150 keV) : 3.82992e-07 ( -3.14882e-08 2.90581e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 124.672 sec. Hardness ratio (energy fluence ratio) = 1.38621244385
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.9994629e-06 S(50-150 keV) = 3.131263e-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 = -2.671879836225824E-01, IMY = -5.909513842115559E-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: -244.315400 -69.384000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6208 22.0128 0.6 43.0 -52.2 6.9691 20.0 0.7 Crab 40.1639 60.5879 2.4 17.4 49.1 0.6344 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -69.384000 9.484600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.8243 21.9672 3.8 43.1 -52.5 0.7361 3.0 11.0 Crab 320.5673 77.0720 0.4 33.0 114.3 5.0622 27.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 61.684600 303.035300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1241 40.8971 4.0 36.6 79.7 1.1629 2.9 3.4 Cyg X-3 326.0056 38.2270 7.0 38.9 57.0 0.6495 1.6 9.7 Cyg X-2 1.6679 35.7724 2.7 45.0 14.9 1.2688 4.3 ------ UNKNOWN 320.6142 77.0663 1.6 0.0 96.3 1.0312 7.4 ------ UNKNOWN 36.5615 48.9031 2.5 39.6 -27.4 0.9536 4.6 ------ UNKNOWN 187.5988 44.2187 2.6 55.2 -155.9 2.3176 4.5 ------ UNKNOWN