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 12:56:22 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger232339
======================================================================
Trigger: 00232339 Segment: 000
BAT Trigger Time: 181684232 [s; MET]
Trigger Stop: 181684233.024 [s; MET]
UTC: 2006-10-04T19:50:30.514260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 97.7482318589518 Dec: -45.8937054140806 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: NO
Rate S/N Ratio: 13.1909059582729 [ if not an image trigger ]
Image S/N Ratio: 8.2
Analysis Position: [ source = BAT ]
RA: 97.7482318589518 Dec: -45.8937054140806 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 97.7899603829384 Dec: -45.9036907045942 [deg; J2000]
{ 06h 31m 09.6s , -45d 54' 13.3" }
+/- 0.853517703176131 [arcmin] (estimated 90% radius based on SNR)
+/- 0.280696740095995 [arcmin] (formal 1-sigma fit error)
SNR: 38.1404830742578
Angular difference between the analysis and refined position is 1.842531 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 6.25999999046326 +/- 0.649356614430661
Measured from: 0.840000003576279
to: 7.09999999403954 [s; relative to TRIGTIME]
T50: 1.91600000858307 +/- 0.266563320438603
Measured from: 2.64399999380112
to: 4.56000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.67199999094009
to: 3.67199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.243999987840652
to: 8.11599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.321732 0.413388 0.224682 0.050821
0.014491 0.015357 0.013277 0.010897 [error]
Peak 0.088534 0.119723 0.080566 0.025874
0.005768 0.006319 0.005547 0.004122 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.872 0.244 8.116
T90 6.260 0.840 7.100
T50 1.916 2.644 4.560
Peak 1.000 2.672 3.672
====== 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 -1.774 -0.089 0.088 - - - 7.85e-03 -4.07e-04 4.04e-04 62.630 57
CPL -1.401 -0.363 0.403 74.243 -18.048 489.559 1.24e-02 -4.38e-03 7.81e-03 59.580 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 -1.596 -0.106 0.105 - - - 1.96e-02 -1.26e-03 1.25e-03 67.640 57
CPL -1.163 -0.442 0.499 90.573 -26.505 3733.197 3.34e-02 -1.37e-02 2.78e-02 64.860 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 1.02e-07 1.59e-07 1.86e-07 4.19e-07 5.69e-07 8.66e-07 erg/cm2
90%_error_low -7.89e-09 -7.60e-09 -1.31e-08 -5.91e-08 -3.03e-08 -7.10e-08 erg/cm2
90%_error_hi 8.07e-09 7.60e-09 1.31e-08 6.55e-08 3.06e-08 7.59e-08 erg/cm2
Peak flux PL 8.85e-01 8.41e-01 5.57e-01 5.72e-01 2.52e+00 2.85e+00 ph/cm2/s
90%_error_low -8.69e-02 -5.26e-02 -4.56e-02 -8.90e-02 -1.53e-01 -1.74e-01 ph/cm2/s
90%_error_hi 8.91e-02 5.25e-02 4.55e-02 9.86e-02 1.53e-01 1.75e-01 ph/cm2/s
Fluence CPL 9.68e-08 1.65e-07 1.86e-07 2.29e-07 5.48e-07 6.77e-07 erg/cm2
90%_error_low -9.32e-09 -9.65e-09 -1.39e-08 -9.68e-08 -3.66e-08 -1.04e-07 erg/cm2
90%_error_hi 9.45e-09 9.86e-09 1.39e-08 1.82e-07 3.66e-08 1.84e-07 erg/cm2
Peak flux CPL 8.32e-01 8.81e-01 5.69e-01 3.34e-01 2.47e+00 2.62e+00 ph/cm2/s
90%_error_low -1.02e-01 -6.66e-02 -4.91e-02 -1.38e-01 -1.61e-01 -2.18e-01 ph/cm2/s
90%_error_hi 1.04e-01 6.85e-02 4.98e-02 2.47e-01 1.60e-01 2.80e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 97.7900 -45.9037 0.0050 16.5629 173.7856 1.0477228 38.140 TRIG_00232339 Foreground time interval of the image: 0.244 8.116 (delta_t = 7.872 [sec]) Background time interval of the image: -239.000 0.244 (delta_t = 239.244 [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 0.244 sec. to 8.116 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77354 ( -0.0893243 0.0881569 ) Norm@50keV : 7.84782E-03 ( -0.000406705 0.000404009 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.63 using 59 PHA bins. # Reduced chi-squared = 1.099 for 57 degrees of freedom # Null hypothesis probability = 2.832484e-01 Photon flux (15-150 keV) in 7.872 sec: 1.07057 ( -0.05207 0.05215 ) ph/cm2/s Energy fluence (15-150 keV) : 5.69436e-07 ( -3.03289e-08 3.05554e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 8.116 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4009 ( -0.363485 0.402689 ) Epeak [keV] : 74.2430 ( -18.0478 489.559 ) Norm@50keV : 1.24006E-02 ( -0.00437646 0.00781153 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.58 using 59 PHA bins. # Reduced chi-squared = 1.064 for 56 degrees of freedom # Null hypothesis probability = 3.467427e-01 Photon flux (15-150 keV) in 7.872 sec: 1.04827 ( -0.05636 0.05629 ) ph/cm2/s Energy fluence (15-150 keV) : 5.4846e-07 ( -3.65957e-08 3.65521e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.672 sec. to 3.672 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.59616 ( -0.105902 0.104673 ) Norm@50keV : 1.96029E-02 ( -0.00125576 0.00124823 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.64 using 59 PHA bins. # Reduced chi-squared = 1.187 for 57 degrees of freedom # Null hypothesis probability = 1.581685e-01 Photon flux (15-150 keV) in 1 sec: 2.51616 ( -0.15341 0.1535 ) ph/cm2/s Energy fluence (15-150 keV) : 1.83443e-07 ( -1.26618e-08 1.27575e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.672 sec. to 3.672 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.1631 ( -0.441688 0.498853 ) Epeak [keV] : 90.5732 ( -26.5305 3733.17 ) Norm@50keV : 3.33833E-02 ( -0.0136438 0.0277617 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.86 using 59 PHA bins. # Reduced chi-squared = 1.158 for 56 degrees of freedom # Null hypothesis probability = 1.951216e-01 Photon flux (15-150 keV) in 1 sec: 2.47155 ( -0.16079 0.16005 ) ph/cm2/s Energy fluence (15-150 keV) : 1.7623e-07 ( -1.47941e-08 1.47377e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 6.26 sec. Hardness ratio (energy fluence ratio) = 1.17001132069
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.607723e-07 S(50-150 keV) = 3.08669e-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 = -2.956600595998222E-01, IMY = -3.219439490819969E-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: -239.000000 0.244000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4840 -40.5624 2.4 32.3 -125.8 1.1421 4.7 2.1 Vela X-1 170.4363 -60.6019 5.2 33.9 -70.7 -0.6100 -2.2 3.8 Cen X-3 186.6933 -62.8212 2.3 38.4 -59.6 1.7265 4.9 3.2 GX 301-2 344.6761 -55.0981 3.5 50.7 31.5 2.6844 3.3 ------ UNKNOWN 71.5396 -26.6783 2.4 39.0 132.8 1.8365 4.9 ------ UNKNOWN 319.3029 -69.9762 2.2 44.1 7.7 1.5825 5.2 ------ UNKNOWN 134.7878 -16.0016 3.7 54.0 -143.2 3.3072 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.244000 8.116000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.2974 -40.4637 20.7 32.3 -126.1 0.0229 0.6 11.9 Vela X-1 170.4676 -60.7479 4.9 33.8 -70.5 0.1182 2.3 8.7 Cen X-3 186.8109 -62.6861 3.7 38.6 -59.7 -0.1823 -3.1 6.6 GX 301-2 352.3584 -60.6514 2.5 43.8 31.3 0.3103 4.6 ------ UNKNOWN 97.7905 -45.9037 0.3 16.6 173.8 1.0476 38.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 49.300600 963.080000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5122 -40.5575 1.6 27.8 -92.5 4.4139 7.1 0.8 Vela X-1 170.4072 -60.6195 30.6 43.3 -48.1 0.4999 0.4 2.7 Cen X-3 186.9051 -62.9440 35.3 49.9 -41.6 -0.6777 -0.3 12.4 GX 301-2 53.4305 -27.4422 2.5 39.4 97.2 6.2359 4.7 ------ UNKNOWN 75.9149 -3.5267 3.4 46.5 144.1 4.8556 3.4 ------ UNKNOWN 30.7865 -82.5624 2.9 41.6 5.2 2.6167 4.0 ------ UNKNOWN 270.6637 -76.9485 4.1 57.1 -7.0 5.0353 2.8 ------ UNKNOWN 213.9254 -68.3778 4.4 56.3 -28.5 7.0585 2.6 ------ UNKNOWN 134.2118 -5.8660 3.7 50.9 -135.5 7.3086 3.1 ------ UNKNOWN