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: Thu Sep 11 15:34:47 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger234905
======================================================================
Trigger: 00234905 Segment: 000
BAT Trigger Time: 183137949.184 [s; MET]
Trigger Stop: 183137950.208 [s; MET]
UTC: 2006-10-21T15:39:07.663300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 145.134075795178 Dec: -21.9284421197878 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.12
Image Trigger?: NO
Rate S/N Ratio: 19.313207915828 [ if not an image trigger ]
Image S/N Ratio: 9.12
Analysis Position: [ source = BAT ]
RA: 145.134075795178 Dec: -21.9284421197878 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 145.148793923512 Dec: -21.9537581305796 [deg; J2000]
{ 09h 40m 35.7s , -21d 57' 13.5" }
+/- 0.623033480857319 [arcmin] (estimated 90% radius based on SNR)
+/- 0.200341417891382 [arcmin] (formal 1-sigma fit error)
SNR: 59.7961941635248
Angular difference between the analysis and refined position is 1.725748 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 47.8200000226498 +/- 5.63259405640524
Measured from: 1.57600000500679
to: 49.3960000276566 [s; relative to TRIGTIME]
T50: 10.7639999985695 +/- 1.27006771456351
Measured from: 3.15200001001358
to: 13.9160000085831 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.4360000193119
to: 3.4360000193119 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00799998641014099
to: 64.9600000083447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.074427 1.603145 1.415414 0.397512
0.043679 0.046106 0.041201 0.034723 [error]
Peak 0.159571 0.277796 0.247144 0.094189
0.008468 0.010193 0.010130 0.008177 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 64.968 -0.008 64.960
T90 47.820 1.576 49.396
T50 10.764 3.152 13.916
Peak 1.000 2.436 3.436
====== 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 -1.282 -0.061 0.062 - - - 4.67e-03 -1.50e-04 1.50e-04 40.540 57
CPL -1.269 -0.074 0.194 9973.470 -9973.470 -9973.470 4.74e-03 -1.93e-04 1.08e-04 40.860 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 -1.134 -0.077 0.078 - - - 5.26e-02 -2.16e-03 2.16e-03 68.950 57
CPL -1.134 -0.073 0.083 9999.360 -9999.360 -9999.360 5.28e-02 -2.17e-03 2.17e-03 69.070 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 3.16e-07 6.64e-07 1.09e-06 4.06e-06 3.01e-06 6.13e-06 erg/cm2
90%_error_low -2.12e-08 -2.59e-08 -4.17e-08 -3.55e-07 -1.04e-07 -3.76e-07 erg/cm2
90%_error_hi 2.17e-08 2.58e-08 4.16e-08 3.79e-07 1.04e-07 3.96e-07 erg/cm2
Peak flux PL 1.52e+00 1.91e+00 1.74e+00 2.76e+00 6.12e+00 7.94e+00 ph/cm2/s
90%_error_low -1.29e-01 -9.60e-02 -8.40e-02 -2.86e-01 -2.59e-01 -3.56e-01 ph/cm2/s
90%_error_hi 1.32e-01 9.53e-02 8.34e-02 3.08e-01 2.59e-01 3.61e-01 ph/cm2/s
Fluence CPL 3.19e-07 6.64e-07 1.09e-06 4.21e-06 3.02e-06 6.20e-06 erg/cm2
90%_error_low N/A -2.64e-08 -4.93e-08 -1.16e-06 N/A -1.39e-06 erg/cm2
90%_error_hi N/A 2.65e-08 6.09e-08 -1.68e-07 N/A 1.97e-07 erg/cm2
Peak flux CPL 1.52e+00 1.90e+00 1.74e+00 2.95e+00 6.15e+00 8.12e+00 ph/cm2/s
90%_error_low -1.29e-01 -8.63e-02 -8.40e-02 N/A -2.94e-01 -6.41e-01 ph/cm2/s
90%_error_hi 1.32e-01 1.05e-01 8.36e-02 N/A 2.23e-01 1.23e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 145.1488 -21.9538 0.0032 25.2554 -62.4924 3.2401347 59.796 TRIG_00234905 Foreground time interval of the image: -0.008 10.517 (delta_t = 10.525 [sec]) Background time interval of the image: -239.184 -0.008 (delta_t = 239.176 [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 -0.008 sec. to 64.960 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2825 ( -0.0613626 0.0616236 ) Norm@50keV : 4.67405E-03 ( -0.000150323 0.000150272 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.54 using 59 PHA bins. # Reduced chi-squared = 0.7113 for 57 degrees of freedom # Null hypothesis probability = 9.512246e-01 Photon flux (15-150 keV) in 64.97 sec: 0.555874 ( -0.019268 0.019338 ) ph/cm2/s Energy fluence (15-150 keV) : 3.01421e-06 ( -1.04139e-07 1.04346e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 64.960 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27847 ( -0.0636875 0.204697 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 4.69397E-03 ( -0.000150534 0.000150497 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.56 using 59 PHA bins. # Reduced chi-squared = 0.7244 for 56 degrees of freedom # Null hypothesis probability = 9.399984e-01 Photon flux (15-150 keV) in 64.97 sec: 0.557284 ( -0.026154 0.022172 ) ph/cm2/s Energy fluence (15-150 keV) : 3.02157e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.436 sec. to 3.436 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13396 ( -0.0773161 0.0777252 ) Norm@50keV : 5.25598E-02 ( -0.00216087 0.00216066 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.95 using 59 PHA bins. # Reduced chi-squared = 1.210 for 57 degrees of freedom # Null hypothesis probability = 1.332620e-01 Photon flux (15-150 keV) in 1 sec: 6.11823 ( -0.25857 0.259 ) ph/cm2/s Energy fluence (15-150 keV) : 5.43776e-07 ( -2.5382e-08 2.54831e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.436 sec. to 3.436 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13441 ( -0.0732845 0.083104 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 5.28306E-02 ( -0.0021703 0.00217115 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.07 using 59 PHA bins. # Reduced chi-squared = 1.233 for 56 degrees of freedom # Null hypothesis probability = 1.127022e-01 Photon flux (15-150 keV) in 1 sec: 6.15230 ( -0.29423 0.22329 ) ph/cm2/s Energy fluence (15-150 keV) : 5.43551e-07 ( -2.53837e-08 2.54329e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 47.82 sec. Hardness ratio (energy fluence ratio) = 1.64437268782
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.80658e-07 S(50-150 keV) = 2.0335516e-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 = 2.178837436603384E-01, IMY = 4.184145176900618E-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: -239.184000 -0.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5473 -40.5872 2.0 36.7 -28.9 1.2856 5.7 2.1 Vela X-1 105.0356 38.0284 2.4 47.1 141.0 3.0331 4.8 ------ UNKNOWN 131.2591 30.1155 2.8 35.5 171.5 0.9342 4.1 ------ UNKNOWN 127.2232 -8.3913 2.2 3.7 -38.3 0.7700 5.2 ------ UNKNOWN 131.8146 -49.9963 2.6 45.3 -21.9 1.2771 4.4 ------ UNKNOWN 126.5022 -57.7968 3.0 52.8 -17.0 1.6571 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.008000 10.516600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5160 -40.5553 69.1 36.6 -28.9 0.0103 0.2 0.6 Vela X-1 87.1007 4.4126 2.9 39.8 86.4 0.5699 4.0 ------ UNKNOWN 110.5557 25.1555 2.9 33.6 137.9 0.2683 4.0 ------ UNKNOWN 148.6634 31.9211 2.6 42.8 -167.6 0.2751 4.4 ------ UNKNOWN 145.1488 -21.9538 0.2 25.3 -62.5 3.2402 59.8 ------ UNKNOWN 164.7017 -20.5178 2.2 40.8 -80.6 0.8808 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 58.916600 542.916000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5425 -40.5077 2.5 20.3 21.7 4.2401 4.6 2.9 Vela X-1 170.4896 -60.4762 6.2 42.4 -17.9 2.6432 1.9 10.2 Cen X-3 186.6266 -62.7617 1.1 49.4 -23.2 19.1577 10.3 1.0 GX 301-2 114.0665 -9.9792 2.5 32.1 107.2 7.9698 4.7 ------ UNKNOWN 103.2579 -69.9906 3.0 54.0 16.7 18.3723 3.9 ------ UNKNOWN 146.9080 29.4270 2.8 51.4 -177.7 9.7350 4.2 ------ UNKNOWN 173.9144 -63.0864 2.9 45.5 -17.5 6.3786 4.0 ------ UNKNOWN 161.2866 1.1403 2.7 28.0 -143.3 4.0455 4.3 ------ UNKNOWN