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 13:32:22 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger230662
======================================================================
Trigger: 00230662 Segment: 000
BAT Trigger Time: 180681136.832 [s; MET]
Trigger Stop: 180681137.856 [s; MET]
UTC: 2006-09-23T05:12:15.370360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.6230284423 Dec: 12.3791714036898 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 7.22
Analysis Position: [ source = BAT ]
RA: 254.6230284423 Dec: 12.3791714036898 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 254.61872958484 Dec: 12.3441554062994 [deg; J2000]
{ 16h 58m 28.5s , +12d 20' 39.0" }
+/- 2.16323126997615 [arcmin] (estimated 90% radius based on SNR)
+/- 0.936650505286851 [arcmin] (formal 1-sigma fit error)
SNR: 10.1018258432006
Angular difference between the analysis and refined position is 2.116013 arcmin
Partial Coding Fraction: 0.3398438 [ including projection effects ]
Duration
T90: 58.4920000135899 +/- 7.12725051867745
Measured from: -40.7360000014305
to: 17.7560000121593 [s; relative to TRIGTIME]
T50: 38.7680000066757 +/- 25.4348790991392
Measured from: -33.6999999880791
to: 5.06800001859665 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0320000052452087
to: 1.03200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.2519999742508
to: 21.4640000164509 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.539751 0.712181 0.366491 -0.014827
0.076747 0.076332 0.064288 0.052869 [error]
Peak 0.041774 0.063633 0.052144 0.014745
0.010236 0.010654 0.009253 0.007332 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 63.716 -42.252 21.464
T90 58.492 -40.736 17.756
T50 38.768 -33.700 5.068
Peak 1.000 0.032 1.032
====== 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 -1.783 -0.221 0.213 - - - 1.66e-03 -2.40e-04 2.37e-04 72.130 57
CPL -0.276 -1.080 1.494 50.803 -9.259 23.034 1.12e-02 -1.12e-02 6.37e-02 65.880 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 -1.450 -0.312 0.310 - - - 1.11e-02 -2.04e-03 2.03e-03 51.860 57
CPL -0.893 -0.830 1.561 102.161 -45.175 -102.161 2.10e-02 -1.16e-02 9.43e-02 51.250 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 1.77e-07 2.73e-07 3.18e-07 7.11e-07 9.77e-07 1.48e-06 erg/cm2
90%_error_low -3.31e-08 -3.54e-08 -5.98e-08 -2.36e-07 -1.43e-07 -3.05e-07 erg/cm2
90%_error_hi 3.44e-08 3.54e-08 6.03e-08 3.01e-07 1.45e-07 3.54e-07 erg/cm2
Peak flux PL 4.37e-01 4.53e-01 3.31e-01 3.90e-01 1.37e+00 1.61e+00 ph/cm2/s
90%_error_low -1.32e-01 -8.97e-02 -7.46e-02 -1.54e-01 -2.53e-01 -2.94e-01 ph/cm2/s
90%_error_hi 1.44e-01 8.81e-02 7.34e-02 2.05e-01 2.54e-01 2.96e-01 ph/cm2/s
Fluence CPL 1.49e-07 3.23e-07 3.15e-07 1.12e-07 8.73e-07 8.99e-07 erg/cm2
90%_error_low -4.01e-08 -4.98e-08 -7.84e-08 N/A -1.48e-07 -1.70e-07 erg/cm2
90%_error_hi 4.03e-08 5.27e-08 7.32e-08 N/A 1.59e-07 2.90e-07 erg/cm2
Peak flux CPL 3.92e-01 4.75e-01 3.49e-01 2.20e-01 1.34e+00 1.44e+00 ph/cm2/s
90%_error_low -1.63e-01 -1.02e-01 -8.36e-02 -2.20e-01 -2.65e-01 -3.28e-01 ph/cm2/s
90%_error_hi 1.70e-01 1.07e-01 8.80e-02 2.29e-01 2.63e-01 3.55e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 254.6187 12.3442 0.0190 33.4962 -78.7839 1.5348785 10.102 TRIG_00230662 Foreground time interval of the image: -42.252 11.269 (delta_t = 53.521 [sec]) Background time interval of the image: -239.832 -42.252 (delta_t = 197.580 [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 -42.252 sec. to 21.464 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.78299 ( -0.221158 0.212893 ) Norm@50keV : 1.66490E-03 ( -0.000240484 0.000236858 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.13 using 59 PHA bins. # Reduced chi-squared = 1.266 for 57 degrees of freedom # Null hypothesis probability = 8.540504e-02 Photon flux (15-150 keV) in 63.72 sec: 0.227934 ( -0.029731 0.029764 ) ph/cm2/s Energy fluence (15-150 keV) : 9.77478e-07 ( -1.42883e-07 1.45099e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.252 sec. to 21.464 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.276167 ( -1.08018 1.49367 ) Epeak [keV] : 50.8025 ( -9.25881 23.0345 ) Norm@50keV : 1.12191E-02 ( -0.0112194 0.0636629 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.88 using 59 PHA bins. # Reduced chi-squared = 1.177 for 56 degrees of freedom # Null hypothesis probability = 1.720181e-01 Photon flux (15-150 keV) in 63.72 sec: 0.216530 ( -0.030985 0.030878 ) ph/cm2/s Energy fluence (15-150 keV) : 8.72926e-07 ( -1.47729e-07 1.58661e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.032 sec. to 1.032 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45021 ( -0.312167 0.309906 ) Norm@50keV : 1.11285E-02 ( -0.00203781 0.002026 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.86 using 59 PHA bins. # Reduced chi-squared = 0.9098 for 57 degrees of freedom # Null hypothesis probability = 6.678792e-01 Photon flux (15-150 keV) in 1 sec: 1.37153 ( -0.25283 0.25361 ) ph/cm2/s Energy fluence (15-150 keV) : 1.065e-07 ( -2.11586e-08 2.14411e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 1.032 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.892991 ( -0.829528 1.56117 ) Epeak [keV] : 102.161 ( -45.1755 -102.161 ) Norm@50keV : 2.09935E-02 ( -0.0116217 0.0942754 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.25 using 59 PHA bins. # Reduced chi-squared = 0.9151 for 56 degrees of freedom # Null hypothesis probability = 6.550845e-01 Photon flux (15-150 keV) in 1 sec: 1.33992 ( -0.26463 0.26297 ) ph/cm2/s Energy fluence (15-150 keV) : 1.02809e-07 ( -2.27205e-08 2.28779e-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 = 1.287251865674372E-01, IMY = 6.491500994038034E-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: -239.832000 -42.252000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4262 35.3874 3.8 39.6 -40.9 1.0504 3.1 3.1 Her X-1 263.1354 -24.7803 5.5 43.6 -139.9 0.8182 2.1 7.2 GX 1+4 268.3782 -1.4613 10.3 23.8 -114.8 0.2318 1.1 0.8 SW J1753.5-0127 270.2836 -25.0808 66.2 40.3 -148.2 0.0493 0.2 0.1 GX 5-1 270.3025 -25.7431 11.1 40.9 -148.7 -0.2985 -1.0 0.0 GRS 1758-258 274.0246 -14.0197 3.4 29.0 -143.9 0.6865 3.4 1.5 GX 17+2 275.9254 -30.3669 15.5 43.1 -158.3 0.2278 0.7 0.0 H1820-303 284.9033 -24.9447 4.5 36.1 -168.6 0.5495 2.6 7.4 HT1900.1-2455 288.7890 10.9394 0.7 0.0 -112.7 2.9526 17.2 0.7 GRS 1915+105 299.5963 35.1998 0.3 26.2 25.6 9.1413 45.6 0.3 Cyg X-1 308.0580 40.8799 3.3 34.4 31.5 0.9854 3.5 5.0 Cyg X-3 326.3373 38.2370 84.3 43.2 49.7 -0.0984 -0.1 9.3 Cyg X-2 262.9766 -33.8534 4.0 51.1 -146.9 1.5317 2.9 1.3 GX 354-0 308.0565 37.6432 1.2 31.8 35.0 2.3478 9.6 ------ UNKNOWN 272.3487 -46.7298 3.5 59.5 -161.6 5.2683 3.4 ------ UNKNOWN 239.8620 39.0264 3.0 51.6 -43.0 4.3146 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -42.252000 11.268580 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5704 35.5413 0.0 39.6 -40.6 -0.3227 -2.3 13.1 Her X-1 263.0602 -24.8368 4.3 43.7 -139.9 0.4480 2.6 6.1 GX 1+4 268.4939 -1.3011 0.0 23.6 -114.6 0.1844 2.0 11.8 SW J1753.5-0127 270.2510 -25.0998 21.6 40.3 -148.2 0.0674 0.5 2.2 GX 5-1 270.1367 -25.6175 20.4 40.8 -148.4 0.0740 0.6 11.7 GRS 1758-258 274.1132 -13.8899 5.2 28.8 -143.9 -0.2066 -2.2 10.8 GX 17+2 276.0595 -30.3584 8.8 43.1 -158.5 -0.1716 -1.3 7.0 H1820-303 285.1702 -25.0446 9.9 36.2 -169.1 0.1249 1.2 10.4 HT1900.1-2455 288.9025 10.9573 4.4 0.1 91.6 0.2128 2.6 6.2 GRS 1915+105 299.6252 35.0759 5.3 26.1 25.8 -0.1983 -2.2 7.7 Cyg X-1 308.0423 41.0182 11.1 34.5 31.4 -0.1300 -1.0 5.0 Cyg X-3 326.2758 38.3476 5.0 43.2 49.5 0.7070 2.3 5.1 Cyg X-2 263.1156 -33.7834 9.2 51.0 -147.0 -0.2981 -1.3 7.0 GX 354-0 322.0782 -8.8920 2.5 38.6 125.0 0.9001 4.7 ------ UNKNOWN 295.4029 -34.3871 3.4 45.8 177.8 0.5126 3.4 ------ UNKNOWN 254.6187 12.3441 1.1 33.5 -78.8 1.5349 10.1 ------ UNKNOWN 254.6902 -26.1706 2.1 49.8 -133.4 2.0565 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.468600 923.068610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9777 -15.6408 0.2 29.6 -157.5 33.8162 51.6 0.1 Sco X-1 254.4393 35.3593 1.1 23.0 3.0 6.2767 10.0 1.4 Her X-1 256.0501 -37.8594 3.1 50.3 -178.0 5.5118 3.7 3.1 4U 1700-377 256.4376 -36.5199 8.0 48.9 -178.5 1.6804 1.4 5.8 GX 349+2 263.1399 -24.7389 4.4 38.0 170.9 2.0206 2.6 7.1 GX 1+4 268.5136 -1.4754 3.3 19.5 137.7 2.1196 3.5 8.8 SW J1753.5-0127 270.4040 -25.2097 6.0 40.6 161.3 2.2369 1.9 10.2 GX 5-1 270.3676 -25.8516 4.2 41.2 161.7 3.1964 2.7 7.4 GRS 1758-258 273.9715 -14.0348 4.8 32.6 146.9 2.2891 2.4 2.0 GX 17+2 275.8673 -30.4044 6.4 47.4 158.3 3.7876 1.8 3.7 H1820-303 285.0582 -24.7726 3.8 47.6 144.9 -6.6419 -3.0 9.0 HT1900.1-2455 288.7777 10.9429 1.8 33.4 92.3 9.6323 6.4 1.2 GRS 1915+105 262.9925 -33.8235 2.6 46.9 173.9 5.3030 4.4 0.7 GX 354-0 236.3853 -44.7693 3.6 59.5 -161.6 14.9484 3.2 ------ UNKNOWN 205.3255 42.0753 5.7 52.0 -42.2 8.0145 2.0 ------ UNKNOWN 208.1355 32.6519 4.2 47.0 -53.2 9.1438 2.8 ------ UNKNOWN 216.2065 -7.5016 4.9 43.1 -112.1 7.5858 2.4 ------ UNKNOWN