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 Sep 10 23:42:27 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger512035
======================================================================
Trigger: 00512035 Segment: 000
BAT Trigger Time: 348638678.016 [s; MET]
Trigger Stop: 348638679.04 [s; MET]
UTC: 2012-01-19T04:04:30.217780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 120.027125198109 Dec: -9.07399060735125 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.49
Image Trigger?: NO
Rate S/N Ratio: 45.4642716866772 [ if not an image trigger ]
Image S/N Ratio: 15.49
Analysis Position: [ source = BAT ]
RA: 120.027125198109 Dec: -9.07399060735125 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 120.029048425626 Dec: -9.07659301295136 [deg; J2000]
{ 08h 00m 07.0s , -09d 04' 35.7" }
+/- 0.444062766481379 [arcmin] (estimated 90% radius based on SNR)
+/- 0.104689114036041 [arcmin] (formal 1-sigma fit error)
SNR: 96.9994549546024
Angular difference between the analysis and refined position is 0.193301 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 68 +/- 7.07106781186548
Measured from: -1.01599997282028
to: 66.9840000271797 [s; relative to TRIGTIME]
T50: 18 +/- 1
Measured from: 7.98400002717972
to: 25.9840000271797 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.98400002717972
to: 9.98400002717972 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.0159999728203
to: 213.98400002718 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.769585 9.962869 8.155082 2.074605
0.092582 0.099345 0.091300 0.080211 [error]
Peak 0.261922 0.472211 0.431073 0.130506
0.009512 0.011540 0.011657 0.008647 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 227.000 -13.016 213.984
T90 68.000 -1.016 66.984
T50 18.000 7.984 25.984
Peak 1.000 8.984 9.984
====== 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 -1.377 -0.031 0.031 - - - 7.74e-03 -1.25e-04 1.25e-04 43.020 57
CPL -1.281 -0.074 0.129 443.353 -217.783 -443.353 8.49e-03 -8.08e-04 1.10e-03 41.330 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.126 -0.053 0.053 - - - 8.48e-02 -2.49e-03 2.49e-03 64.810 57
CPL -0.780 -0.220 0.231 197.561 -57.034 229.024 1.22e-01 -2.44e-02 3.23e-02 57.420 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 2.00e-06 3.96e-06 6.10e-06 2.05e-05 1.70e-05 3.26e-05 erg/cm2
90%_error_low -7.20e-08 -8.25e-08 -1.09e-07 -8.76e-07 -2.76e-07 -9.08e-07 erg/cm2
90%_error_hi 7.32e-08 8.23e-08 1.08e-07 9.05e-07 2.75e-07 9.30e-07 erg/cm2
Peak flux PL 2.44e+00 3.07e+00 2.81e+00 4.50e+00 9.86e+00 1.28e+01 ph/cm2/s
90%_error_low -1.44e-01 -1.10e-01 -9.47e-02 -3.23e-01 -2.99e-01 -4.07e-01 ph/cm2/s
90%_error_hi 1.48e-01 1.10e-01 9.44e-02 3.38e-01 2.99e-01 4.11e-01 ph/cm2/s
Fluence CPL 1.94e-06 3.97e-06 6.15e-06 1.83e-05 1.70e-05 3.03e-05 erg/cm2
90%_error_low -1.01e-07 -8.38e-08 -1.28e-07 -2.57e-06 -3.02e-07 -2.57e-06 erg/cm2
90%_error_hi 5.15e-08 8.40e-08 1.31e-07 2.48e-06 3.01e-07 2.54e-06 erg/cm2
Peak flux CPL 2.24e+00 3.13e+00 2.92e+00 3.16e+00 9.69e+00 1.14e+01 ph/cm2/s
90%_error_low -1.86e-01 -1.18e-01 -1.15e-01 -6.07e-01 -3.16e-01 -6.97e-01 ph/cm2/s
90%_error_hi 1.91e-01 1.19e-01 1.16e-01 7.88e-01 3.16e-01 8.46e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 120.0290 -9.0766 0.0020 5.1274 -12.4952 10.9258662 96.999 TRIG_00512035 Foreground time interval of the image: -13.016 12.085 (delta_t = 25.101 [sec]) Background time interval of the image: -239.016 -13.016 (delta_t = 226.000 [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 -13.016 sec. to 213.984 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37738 ( -0.0312367 0.031307 ) Norm@50keV : 7.73524E-03 ( -0.000125383 0.000125236 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.02 using 59 PHA bins. # Reduced chi-squared = 0.7548 for 57 degrees of freedom # Null hypothesis probability = 9.147804e-01 Photon flux (15-150 keV) in 227 sec: 0.937300 ( -0.017636 0.017698 ) ph/cm2/s Energy fluence (15-150 keV) : 1.70493e-05 ( -2.75682e-07 2.7544e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.016 sec. to 213.984 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28107 ( -0.073649 0.128936 ) Epeak [keV] : 443.353 ( -217.832 -443.402 ) Norm@50keV : 8.49223E-03 ( -0.000807426 0.00110227 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.33 using 59 PHA bins. # Reduced chi-squared = 0.7381 for 56 degrees of freedom # Null hypothesis probability = 9.285692e-01 Photon flux (15-150 keV) in 227 sec: 0.929321 ( -0.020229 0.020335 ) ph/cm2/s Energy fluence (15-150 keV) : 1.69537e-05 ( -3.02148e-07 3.00893e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.984 sec. to 9.984 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.12581 ( -0.052945 0.0530679 ) Norm@50keV : 8.47845E-02 ( -0.00249356 0.00249327 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.81 using 59 PHA bins. # Reduced chi-squared = 1.137 for 57 degrees of freedom # Null hypothesis probability = 2.229693e-01 Photon flux (15-150 keV) in 1 sec: 9.86049 ( -0.29859 0.29881 ) ph/cm2/s Energy fluence (15-150 keV) : 8.79367e-07 ( -2.88167e-08 2.88926e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.984 sec. to 9.984 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.779964 ( -0.219525 0.231005 ) Epeak [keV] : 197.561 ( -57.036 229.022 ) Norm@50keV : 0.121740 ( -0.0244362 0.0323311 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.42 using 59 PHA bins. # Reduced chi-squared = 1.025 for 56 degrees of freedom # Null hypothesis probability = 4.224750e-01 Photon flux (15-150 keV) in 1 sec: 9.69093 ( -0.316 0.31617 ) ph/cm2/s Energy fluence (15-150 keV) : 8.61291e-07 ( -3.14593e-08 3.12949e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 68.0 sec. Hardness ratio (energy fluence ratio) = 1.53971391394
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.958244e-06 S(50-150 keV) = 1.1090839e-05
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 = 8.760464921093211E-02, IMY = 1.941371800310528E-02
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: -239.016000 -13.016000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5713 -40.5358 2.4 34.7 -95.1 2.2472 4.9 2.3 Vela X-1 150.8658 13.5764 2.5 33.1 150.6 1.4891 4.6 ------ UNKNOWN 142.0945 -0.5167 2.4 18.4 168.8 0.9095 4.8 ------ UNKNOWN 154.7583 -24.2952 3.0 33.3 -136.5 1.0200 3.9 ------ UNKNOWN 102.9514 -47.9569 3.0 44.8 -59.9 3.4904 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -13.016000 12.084600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4883 -40.7177 7.4 34.8 -94.9 0.3832 1.6 9.9 Vela X-1 123.3378 18.8244 2.5 26.1 96.1 0.8097 4.7 ------ UNKNOWN 72.5431 -1.0451 2.6 52.5 13.5 2.0252 4.4 ------ UNKNOWN 120.0290 -9.0766 0.1 5.1 -12.5 10.9261 97.0 ------ UNKNOWN 175.3043 -26.1393 2.5 51.5 -142.8 2.1579 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 41.084600 423.034000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6251 21.9966 1.1 47.3 40.7 8.7419 10.8 1.2 Crab 135.4273 -40.5445 4.1 34.3 -111.8 1.1031 2.8 4.7 Vela X-1 173.6423 -1.3558 2.0 53.9 174.2 5.0393 5.8 ------ UNKNOWN 113.3042 -2.3032 2.8 9.5 44.1 0.8491 4.1 ------ UNKNOWN 120.0344 -9.0928 0.8 0.0 -124.5 2.8476 13.7 ------ UNKNOWN 74.7068 -14.8407 2.5 44.6 -12.8 1.5636 4.6 ------ UNKNOWN 66.5239 -17.7709 3.5 52.6 -16.3 1.6905 3.3 ------ UNKNOWN