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 13:41:03 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger229185
======================================================================
Trigger: 00229185 Segment: 000
BAT Trigger Time: 179762155.584 [s; MET]
Trigger Stop: 179762156.608 [s; MET]
UTC: 2006-09-12T13:55:54.144260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 5.28584793860298 Dec: 20.9715924063833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.85
Image Trigger?: NO
Rate S/N Ratio: 81.3879597975032 [ if not an image trigger ]
Image S/N Ratio: 19.85
Analysis Position: [ source = BAT ]
RA: 5.28584793860298 Dec: 20.9715924063833 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 5.28077824897349 Dec: 20.9683564981093 [deg; J2000]
{ 00h 21m 07.4s , +20d 58' 06.1" }
+/- 0.898579971245838 [arcmin] (estimated 90% radius based on SNR)
+/- 0.253592557013744 [arcmin] (formal 1-sigma fit error)
SNR: 35.4377306192753
Angular difference between the analysis and refined position is 0.344052 arcmin
Partial Coding Fraction: 0.3359375 [ including projection effects ]
Duration
T90: 5.0280000269413 +/- 0.580675464663478
Measured from: -0.11599999666214
to: 4.91200003027916 [s; relative to TRIGTIME]
T50: 1.74800002574921 +/- 0.186290076497368
Measured from: 0.38400000333786
to: 2.13200002908707 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.560000002384186
to: 6.11599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.700217 0.843018 0.572947 0.137242
0.027030 0.029304 0.025491 0.020757 [error]
Peak 0.268770 0.390847 0.253709 0.051900
0.013644 0.015326 0.013477 0.009616 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.676 -0.560 6.116
T90 5.028 -0.116 4.912
T50 1.748 0.384 2.132
Peak 1.000 0.000 1.000
====== 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 -1.729 -0.080 0.080 - - - 2.21e-02 -9.61e-04 9.57e-04 67.600 57
CPL -1.730 -0.078 0.083 9999.290 -9999.280 -9999.290 2.21e-02 -7.02e-03 5.62e-03 67.620 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 -1.654 -0.083 0.082 - - - 6.53e-02 -3.23e-03 3.22e-03 54.500 57
CPL -1.196 -0.322 0.349 86.386 -18.834 82.700 1.12e-01 -3.47e-02 5.57e-02 48.400 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 2.34e-07 3.74e-07 4.51e-07 1.06e-06 1.36e-06 2.12e-06 erg/cm2
90%_error_low -1.72e-08 -1.62e-08 -2.65e-08 -1.31e-07 -6.16e-08 -1.51e-07 erg/cm2
90%_error_hi 1.76e-08 1.62e-08 2.65e-08 1.43e-07 6.18e-08 1.61e-07 erg/cm2
Peak flux PL 3.12e+00 2.86e+00 1.82e+00 1.77e+00 8.54e+00 9.58e+00 ph/cm2/s
90%_error_low -2.48e-01 -1.44e-01 -1.14e-01 -2.14e-01 -4.19e-01 -4.54e-01 ph/cm2/s
90%_error_hi 2.54e-01 1.43e-01 1.13e-01 2.31e-01 4.19e-01 4.54e-01 ph/cm2/s
Fluence CPL 2.34e-07 3.74e-07 4.49e-07 1.06e-06 1.36e-06 2.13e-06 erg/cm2
90%_error_low -1.72e-08 N/A -2.47e-08 N/A -5.62e-08 -3.23e-07 erg/cm2
90%_error_hi 1.76e-08 N/A 2.84e-08 N/A 6.19e-08 6.57e-08 erg/cm2
Peak flux CPL 3.03e+00 2.25e+00 1.15e+00 1.00e+00 6.85e+00 7.42e+00 ph/cm2/s
90%_error_low -3.08e-01 -2.23e-01 -4.73e-02 -9.84e-02 -7.61e-01 -6.72e-01 ph/cm2/s
90%_error_hi 1.36e-01 1.97e-01 9.51e-02 1.10e-01 6.56e-01 5.61e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
5.2808 20.9684 0.0054 33.1688 125.7329 2.2791541 35.438 TRIG_00229185
Foreground time interval of the image:
-0.560 6.116 (delta_t = 6.676 [sec])
Background time interval of the image:
-239.584 -0.560 (delta_t = 239.024 [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 -0.560 sec. to 6.116 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72868 ( -0.0803243 0.0796071 ) Norm@50keV : 2.21167E-02 ( -0.000960723 0.000956696 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.60 using 59 PHA bins. # Reduced chi-squared = 1.186 for 57 degrees of freedom # Null hypothesis probability = 1.589957e-01 Photon flux (15-150 keV) in 6.676 sec: 2.96753 ( -0.13042 0.1309 ) ph/cm2/s Energy fluence (15-150 keV) : 1.36445e-06 ( -6.16218e-08 6.18375e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.560 sec. to 6.116 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73009 ( -0.0790603 0.0822274 ) Epeak [keV] : 9999.29 ( -9999.35 -9999.36 ) Norm@50keV : 2.20796E-02 ( -0.00708595 0.00555418 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.62 using 59 PHA bins. # Reduced chi-squared = 1.208 for 56 degrees of freedom # Null hypothesis probability = 1.373128e-01 Photon flux (15-150 keV) in 6.676 sec: 2.98675 ( -0.15026 0.1119 ) ph/cm2/s Energy fluence (15-150 keV) : 1.36423e-06 ( -5.62014e-08 6.18608e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65449 ( -0.0828892 0.0821027 ) Norm@50keV : 6.53178E-02 ( -0.00323374 0.00322237 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.50 using 59 PHA bins. # Reduced chi-squared = 0.9562 for 57 degrees of freedom # Null hypothesis probability = 5.692894e-01 Photon flux (15-150 keV) in 1 sec: 8.54188 ( -0.41887 0.4194 ) ph/cm2/s Energy fluence (15-150 keV) : 6.07295e-07 ( -3.1696e-08 3.18362e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19628 ( -0.322238 0.348536 ) Epeak [keV] : 86.3861 ( -18.8341 82.7001 ) Norm@50keV : 0.112149 ( -0.0346971 0.0557271 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.40 using 59 PHA bins. # Reduced chi-squared = 0.8643 for 56 degrees of freedom # Null hypothesis probability = 7.548065e-01 Photon flux (15-150 keV) in 1 sec: 6.84585 ( -0.7608 0.65566 ) ph/cm2/s Energy fluence (15-150 keV) : 5.88085e-07 ( -3.47986e-08 3.47027e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 5.028 sec. Hardness ratio (energy fluence ratio) = 1.20692432596
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.074661e-07 S(50-150 keV) = 7.56964e-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 = -3.817101656232284E-01, IMY = -5.305631240612986E-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: -239.584000 -0.560000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 355.5141 12.7222 2.5 38.1 106.0 2.2338 4.6 ------ UNKNOWN 17.2591 50.9122 2.7 52.1 163.9 2.5176 4.3 ------ UNKNOWN 49.5971 -54.1787 2.5 56.4 -16.8 2.9734 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.560000 6.116000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 5.2808 20.9683 0.3 33.2 125.7 2.2789 35.4 ------ UNKNOWN 74.5641 27.5171 2.2 49.1 -131.8 0.6132 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 91.716580 962.515600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0521 41.0329 12.2 52.0 -175.4 1.1367 1.0 5.5 Cyg X-3 326.1878 38.3360 16.9 37.8 -175.6 0.3855 0.7 1.1 Cyg X-2 319.3383 8.1370 2.5 46.1 139.2 6.9075 4.7 ------ UNKNOWN 28.5626 -13.0927 3.5 41.0 22.5 2.2205 3.3 ------ UNKNOWN 308.0680 37.6694 0.9 51.8 -179.6 13.9344 12.8 ------ UNKNOWN 26.6976 29.1347 3.0 21.0 -58.8 1.4936 3.8 ------ UNKNOWN 309.7392 53.9174 2.9 53.1 -159.1 4.9707 4.0 ------ UNKNOWN 62.4919 8.8548 4.1 56.3 -28.4 6.8111 2.8 ------ UNKNOWN 61.3116 20.7112 3.2 52.0 -42.1 9.4240 3.6 ------ UNKNOWN