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 18:37:06 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger507185
======================================================================
Trigger: 00507185 Segment: 000
BAT Trigger Time: 342319831.552 [s; MET]
Trigger Stop: 342319832.576 [s; MET]
UTC: 2011-11-07T00:50:24.005480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 129.483957089502 Dec: -66.5062128673647 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.26
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 8.26
Analysis Position: [ source = BAT ]
RA: 129.483957089502 Dec: -66.5062128673647 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 129.485162907022 Dec: -66.5197154018901 [deg; J2000]
{ 08h 37m 56.4s , -66d 31' 11.0" }
+/- 1.15762095738858 [arcmin] (estimated 90% radius based on SNR)
+/- 0.365520213246293 [arcmin] (formal 1-sigma fit error)
SNR: 24.6779605066306
Angular difference between the analysis and refined position is 0.810665 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 31.0720000267029 +/- 7.15255476285363
Measured from: 0.76800000667572
to: 31.8400000333786 [s; relative to TRIGTIME]
T50: 11.0880000591278 +/- 2.66984338721389
Measured from: 3.15200001001358
to: 14.2400000691414 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.13200002908707
to: 3.13200002908707 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0960000157356262
to: 37.4560000300407 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.424469 0.549489 0.400311 0.112398
0.037682 0.038448 0.033017 0.028420 [error]
Peak 0.036081 0.052270 0.055092 0.011930
0.006782 0.007235 0.006573 0.005240 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 37.552 -0.096 37.456
T90 31.072 0.768 31.840
T50 11.088 3.152 14.240
Peak 1.000 2.132 3.132
====== 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 -1.483 -0.145 0.144 - - - 2.55e-03 -2.00e-04 1.99e-04 60.320 57
CPL -1.480 -0.147 0.333 9999.360 -9999.360 -9999.360 2.56e-03 -2.01e-03 -1.14e-03 60.340 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 -1.104 -0.234 0.239 - - - 1.07e-02 -1.39e-03 1.38e-03 53.890 57
CPL -0.980 -0.341 0.835 473.544 -473.544 -473.544 1.21e-02 -1.21e-02 -8.49e-03 53.920 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 1.21e-07 2.24e-07 3.20e-07 9.68e-07 9.12e-07 1.63e-06 erg/cm2
90%_error_low -1.65e-08 -1.83e-08 -3.33e-08 -2.06e-07 -7.88e-08 -2.32e-07 erg/cm2
90%_error_hi 1.72e-08 1.82e-08 3.31e-08 2.42e-07 7.96e-08 2.61e-07 erg/cm2
Peak flux PL 3.01e-01 3.84e-01 3.57e-01 5.84e-01 1.24e+00 1.63e+00 ph/cm2/s
90%_error_low -7.68e-02 -6.20e-02 -5.26e-02 -1.69e-01 -1.65e-01 -2.25e-01 ph/cm2/s
90%_error_hi 8.39e-02 6.06e-02 5.18e-02 2.09e-01 1.66e-01 2.32e-01 ph/cm2/s
Fluence CPL 1.22e-07 2.22e-07 3.18e-07 1.03e-06 9.18e-07 1.58e-06 erg/cm2
90%_error_low N/A -2.16e-08 N/A -4.60e-07 -1.05e-07 -3.66e-07 erg/cm2
90%_error_hi N/A 1.26e-08 N/A 5.20e-08 9.54e-08 3.01e-07 erg/cm2
Peak flux CPL 3.02e-01 3.84e-01 3.58e-01 5.50e-01 1.24e+00 1.62e+00 ph/cm2/s
90%_error_low -1.02e-01 -6.05e-02 -5.24e-02 -3.06e-01 -1.74e-01 -3.97e-01 ph/cm2/s
90%_error_hi 5.89e-02 6.52e-02 6.47e-02 2.34e-01 1.65e-01 2.20e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 129.4852 -66.5197 0.0078 21.8382 -108.3915 0.9915774 24.678 TRIG_00507185 Foreground time interval of the image: -0.096 10.749 (delta_t = 10.845 [sec]) Background time interval of the image: -239.552 -0.096 (delta_t = 239.456 [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 -0.096 sec. to 37.456 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48341 ( -0.144997 0.144281 ) Norm@50keV : 2.55402E-03 ( -0.000199761 0.000198868 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.32 using 59 PHA bins. # Reduced chi-squared = 1.058 for 57 degrees of freedom # Null hypothesis probability = 3.566235e-01 Photon flux (15-150 keV) in 37.55 sec: 0.317449 ( -0.024929 0.025018 ) ph/cm2/s Energy fluence (15-150 keV) : 9.12431e-07 ( -7.88268e-08 7.95876e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.096 sec. to 37.456 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.30536 ( -0.146767 0.33296 ) Epeak [keV] : 108.424 ( -9999.36 -9999.36 ) Norm@50keV : 9.70436E-04 ( -0.000413545 0.000456037 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.55 using 59 PHA bins. # Reduced chi-squared = 1.046 for 56 degrees of freedom # Null hypothesis probability = 3.820580e-01 Photon flux (15-150 keV) in 37.55 sec: 0.319304 ( ) ph/cm2/s Energy fluence (15-150 keV) : 9.17594e-07 ( -1.05194e-07 9.54303e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.132 sec. to 3.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10355 ( -0.233593 0.239105 ) Norm@50keV : 1.06788E-02 ( -0.00138525 0.00138337 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.89 using 59 PHA bins. # Reduced chi-squared = 0.9455 for 57 degrees of freedom # Null hypothesis probability = 5.923465e-01 Photon flux (15-150 keV) in 1 sec: 1.23909 ( -0.16543 0.16603 ) ph/cm2/s Energy fluence (15-150 keV) : 1.11535e-07 ( -1.59301e-08 1.6056e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.132 sec. to 3.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.39412 ( -0.332973 0.843874 ) Epeak [keV] : 128.609 ( -9996.4 -9996.4 ) Norm@50keV : 1.71947E-03 ( -0.00171891 0.00192211 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.77 using 59 PHA bins. # Reduced chi-squared = 0.9602 for 56 degrees of freedom # Null hypothesis probability = 5.597694e-01 Photon flux (15-150 keV) in 1 sec: 1.23917 ( -0.17383 0.16506 ) ph/cm2/s Energy fluence (15-150 keV) : 1.11383e-07 ( -1.66176e-08 1.52742e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 31.072 sec. Hardness ratio (energy fluence ratio) = 1.43057331614
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.443776e-07 S(50-150 keV) = 5.680446e-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 = -1.264382464052418E-01, IMY = 3.802761465076993E-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: -239.552000 -0.096000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5285 -40.5516 0.9 38.2 -151.4 3.3390 13.4 0.2 Vela X-1 170.4690 -60.7191 9.4 40.5 -104.5 1.1651 1.2 7.3 Cen X-3 38.2852 -59.8912 2.2 21.1 16.4 0.9807 5.2 ------ UNKNOWN 317.8631 -55.8309 2.2 55.7 -21.0 3.5692 5.3 ------ UNKNOWN 146.6383 -35.1560 3.3 47.9 -146.4 1.4581 3.5 ------ UNKNOWN 277.3610 -70.2728 3.1 49.0 -48.5 3.4795 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.096000 10.748590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5635 -40.7127 5.5 38.1 -151.2 0.1090 2.1 9.6 Vela X-1 170.3460 -60.4921 7.4 40.6 -104.8 0.2187 1.6 7.9 Cen X-3 129.4852 -66.5197 0.5 21.8 -108.4 0.9915 24.7 ------ UNKNOWN 157.1983 -57.8023 2.3 36.9 -114.8 0.3737 5.0 ------ UNKNOWN 148.9944 -32.5026 2.0 51.2 -146.4 0.6269 5.8 ------ UNKNOWN 191.8870 -75.8841 2.3 36.9 -77.9 0.4470 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 54.148600 962.552900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5338 -40.5639 0.6 26.2 -178.0 12.2693 20.3 0.6 Vela X-1 170.3111 -60.6227 0.8 18.7 -97.3 7.9450 13.7 0.1 Cen X-3 186.6369 -62.7714 0.5 23.9 -80.3 14.5545 21.7 0.5 GX 301-2 48.3677 -61.7643 2.3 33.1 50.2 4.5863 5.1 ------ UNKNOWN 125.2887 -23.7827 2.6 42.8 165.9 4.8326 4.4 ------ UNKNOWN 337.1023 -70.5617 2.9 41.6 4.9 3.3941 3.9 ------ UNKNOWN 86.1292 -88.9719 3.0 22.7 -6.7 2.1351 3.9 ------ UNKNOWN 148.7780 -8.9281 4.2 59.1 -166.1 9.6301 2.8 ------ UNKNOWN 272.4265 -55.8456 3.6 54.5 -33.0 9.7656 3.2 ------ UNKNOWN