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: Mon Jan 13 17:57:23 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger508319
======================================================================
Trigger: 00508319 Segment: 000
BAT Trigger Time: 343764808.704 [s; MET]
Trigger Stop: 343764812.8 [s; MET]
UTC: 2011-11-23T18:13:21.100200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.851114339607 Dec: -20.6415977436912 [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: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 8.2
Analysis Position: [ source = BAT ]
RA: 154.851114339607 Dec: -20.6415977436912 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 154.845416221215 Dec: -20.638852188003 [deg; J2000]
{ 10h 19m 22.9s , -20d 38' 19.9" }
+/- 1.12267419132088 [arcmin] (estimated 90% radius based on SNR)
+/- 0.381839973705797 [arcmin] (formal 1-sigma fit error)
SNR: 25.7826364197595
Angular difference between the analysis and refined position is 0.359861 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 290 +/- 88.090862182181
Measured from: 3.2960000038147
to: 293.296000003815 [s; relative to TRIGTIME]
T50: 81 +/- 7.61577310586391
Measured from: 70.2960000038147
to: 151.296000003815 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 146.296000003815
to: 147.296000003815 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.7039999961853
to: 481.296000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.923001 4.585913 3.255230 0.742069
0.122694 0.125045 0.108573 0.093229 [error]
Peak 0.028461 0.044396 0.038196 0.009802
0.005744 0.006110 0.005309 0.004230 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 490.000 -8.704 481.296
T90 290.000 3.296 293.296
T50 81.000 70.296 151.296
Peak 1.000 146.296 147.296
====== 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 -1.660 -0.067 0.067 - - - 1.56e-03 -5.35e-05 5.33e-05 65.250 57
CPL -1.642 -0.086 0.160 954.485 -808.136 -954.485 1.59e-03 -8.21e-05 2.36e-05 65.450 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 -1.328 -0.265 0.268 - - - 7.46e-03 -1.11e-03 1.11e-03 52.760 57
CPL -1.333 -0.258 0.345 9999.360 -9999.360 -9999.360 7.48e-03 -1.11e-03 6.89e-03 52.770 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 1.13e-06 1.89e-06 2.39e-06 6.05e-06 7.10e-06 1.15e-05 erg/cm2
90%_error_low -7.20e-08 -6.86e-08 -1.11e-07 -6.10e-07 -2.57e-07 -6.83e-07 erg/cm2
90%_error_hi 7.38e-08 6.83e-08 1.11e-07 6.58e-07 2.58e-07 7.20e-07 erg/cm2
Peak flux PL 2.60e-01 2.90e-01 2.31e-01 3.05e-01 8.95e-01 1.09e+00 ph/cm2/s
90%_error_low -6.84e-02 -4.83e-02 -4.29e-02 -1.04e-01 -1.34e-01 -1.67e-01 ph/cm2/s
90%_error_hi 7.29e-02 4.71e-02 4.20e-02 1.35e-01 1.34e-01 1.70e-01 ph/cm2/s
Fluence CPL 1.14e-06 1.89e-06 2.38e-06 6.61e-06 7.16e-06 1.13e-05 erg/cm2
90%_error_low -9.31e-08 N/A -1.02e-07 N/A -3.14e-07 -1.28e-06 erg/cm2
90%_error_hi 7.89e-08 N/A 1.20e-07 N/A 2.01e-07 8.82e-07 erg/cm2
Peak flux CPL 2.60e-01 2.90e-01 2.30e-01 3.37e-01 9.00e-01 1.09e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A -1.74e-01 -1.76e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 1.63e-01 1.50e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 154.8454 -20.6389 0.0075 26.0287 167.3440 2.2557843 25.783 TRIG_00508319 Foreground time interval of the image: -8.704 41.397 (delta_t = 50.101 [sec]) Background time interval of the image: -239.704 -8.704 (delta_t = 231.000 [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 -8.704 sec. to 481.296 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65999 ( -0.0670717 0.0667031 ) Norm@50keV : 1.56024E-03 ( -5.35195e-05 5.33472e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.25 using 59 PHA bins. # Reduced chi-squared = 1.145 for 57 degrees of freedom # Null hypothesis probability = 2.118115e-01 Photon flux (15-150 keV) in 490 sec: 0.204413 ( -0.007394 0.00743 ) ph/cm2/s Energy fluence (15-150 keV) : 7.10436e-06 ( -2.57115e-07 2.57981e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.704 sec. to 481.296 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65829 ( -0.0858169 0.160188 ) Epeak [keV] : 1.00000E+04 ( -9853.65 -10000 ) Norm@50keV : 1.56338E-03 ( -5.37001e-05 5.20272e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.27 using 59 PHA bins. # Reduced chi-squared = 1.165 for 56 degrees of freedom # Null hypothesis probability = 1.857066e-01 Photon flux (15-150 keV) in 490 sec: 0.205998 ( -0.009005 0.00581 ) ph/cm2/s Energy fluence (15-150 keV) : 7.15562e-06 ( -3.14357e-07 2.00626e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 146.296 sec. to 147.296 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32759 ( -0.265115 0.267504 ) Norm@50keV : 7.46162E-03 ( -0.0011113 0.00110668 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.76 using 59 PHA bins. # Reduced chi-squared = 0.9256 for 57 degrees of freedom # Null hypothesis probability = 6.348161e-01 Photon flux (15-150 keV) in 1 sec: 0.894884 ( -0.133947 0.134186 ) ph/cm2/s Energy fluence (15-150 keV) : 7.32588e-08 ( -1.22897e-08 1.24312e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 146.296 sec. to 147.296 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33291 ( -0.258416 0.344218 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 7.48443E-03 ( -0.00111337 0.00688944 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.77 using 59 PHA bins. # Reduced chi-squared = 0.9424 for 56 degrees of freedom # Null hypothesis probability = 5.978282e-01 Photon flux (15-150 keV) in 1 sec: 0.900104 ( -0.173748 0.163196 ) ph/cm2/s Energy fluence (15-150 keV) : 7.37089e-08 ( -1.55495e-08 7.2156e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 290.0 sec. Hardness ratio (energy fluence ratio) = 1.26578513183
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.025576e-06 S(50-150 keV) = 4.078727e-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 = -4.764869517058909E-01, IMY = -1.069963987899719E-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: -239.704000 -8.704000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5147 -40.5461 1.2 15.2 94.0 1.8607 9.9 0.8 Vela X-1 170.3180 -60.6414 1.1 16.7 -40.2 1.8885 10.2 1.1 Cen X-3 186.7650 -62.8227 3.9 24.1 -49.2 0.6124 2.9 4.3 GX 301-2 120.8019 -51.2362 2.1 22.5 52.9 1.2469 5.6 ------ UNKNOWN 153.3618 -5.0805 3.0 41.6 165.1 1.3254 3.9 ------ UNKNOWN 183.7814 3.6375 2.4 56.4 -157.3 4.1875 4.9 ------ UNKNOWN 190.1830 -0.3011 2.9 55.7 -148.3 4.0746 4.0 ------ UNKNOWN 202.3893 -24.4301 3.5 43.8 -116.4 2.6116 3.3 ------ UNKNOWN 208.3293 -35.2779 2.7 41.2 -99.0 4.5522 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.704000 41.396600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5505 -40.6489 10.3 15.1 93.7 -0.1009 -1.1 5.7 Vela X-1 170.6206 -60.4727 0.0 16.6 -40.9 0.1268 1.5 12.7 Cen X-3 186.3478 -62.8017 7.1 23.9 -49.0 0.1457 1.6 8.7 GX 301-2 154.8454 -20.6389 0.5 26.0 167.3 2.2558 25.8 ------ UNKNOWN 194.4863 -31.3756 2.4 34.0 -115.3 0.6316 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 88.596590 934.496620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5337 -40.5293 0.7 25.8 18.1 8.0611 15.8 1.5 Vela X-1 170.3211 -60.6356 1.2 41.4 -28.6 7.6981 9.8 0.8 Cen X-3 186.7308 -62.7840 7.9 47.4 -36.3 1.6016 1.5 2.2 GX 301-2 119.4645 -29.4396 2.8 33.1 50.3 3.3883 4.2 ------ UNKNOWN 157.0137 22.1038 2.9 42.8 165.8 3.8400 4.0 ------ UNKNOWN 147.9150 -25.3622 3.1 7.9 35.1 1.5736 3.8 ------ UNKNOWN 154.8560 -20.6384 0.6 0.0 -179.5 8.8341 18.4 ------ UNKNOWN 159.7120 -7.2032 3.3 14.2 -177.2 1.5386 3.5 ------ UNKNOWN 156.2768 -54.5019 2.5 33.9 -18.7 2.5163 4.7 ------ UNKNOWN 185.7250 30.4501 3.0 59.1 -166.1 13.6245 3.8 ------ UNKNOWN 165.3534 -78.8079 3.9 58.4 -19.6 8.2805 3.0 ------ UNKNOWN