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: Sat Jan 11 22:05:01 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger579683
======================================================================
Trigger: 00579683 Segment: 000
BAT Trigger Time: 407343995.904 [s; MET]
Trigger Stop: 407343996.416 [s; MET]
UTC: 2013-11-28T15:06:24.575040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 355.323120755133 Dec: 31.2793393516818 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.17
Image Trigger?: NO
Rate S/N Ratio: 23.3023603954621 [ if not an image trigger ]
Image S/N Ratio: 11.17
Analysis Position: [ source = BAT ]
RA: 355.323120755133 Dec: 31.2793393516818 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 355.305331633583 Dec: 31.2928211504896 [deg; J2000]
{ 23h 41m 13.3s , +31d 17' 34.2" }
+/- 1.57764728989873 [arcmin] (estimated 90% radius based on SNR)
+/- 0.617945374071145 [arcmin] (formal 1-sigma fit error)
SNR: 15.8579510072656
Angular difference between the analysis and refined position is 1.219151 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.903999984264374
to: 2.09600001573563 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: 0.0960000157356262
to: 1.09600001573563 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0960000157356262
to: 1.09600001573563 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.903999984264374
to: 2.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.184048 0.190619 0.142317 0.016720
0.017102 0.017947 0.015545 0.012191 [error]
Peak 0.099286 0.116326 0.087213 0.003991
0.010734 0.011518 0.009987 0.007193 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 3.000 -0.904 2.096
T90 3.000 -0.904 2.096
T50 1.000 0.096 1.096
Peak 1.000 0.096 1.096
====== 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 -1.811 -0.174 0.167 - - - 1.15e-02 -1.26e-03 1.24e-03 64.340 57
CPL -1.112 -0.657 0.768 60.902 -14.334 135.936 2.67e-02 -1.44e-02 3.89e-02 60.990 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 -1.801 -0.175 0.167 - - - 1.95e-02 -2.31e-03 2.28e-03 63.450 57
CPL -0.147 -0.864 1.064 54.389 -7.383 11.624 1.41e-01 -8.94e-02 3.36e-01 51.080 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 5.90e-08 8.97e-08 1.02e-07 2.23e-07 3.17e-07 4.74e-07 erg/cm2
90%_error_low -8.46e-09 -8.65e-09 -1.50e-08 -5.96e-08 -3.51e-08 -7.58e-08 erg/cm2
90%_error_hi 8.73e-09 8.65e-09 1.50e-08 7.19e-08 3.54e-08 8.51e-08 erg/cm2
Peak flux PL 1.07e+00 9.05e-01 5.20e-01 4.44e-01 2.69e+00 2.94e+00 ph/cm2/s
90%_error_low -1.64e-01 -9.71e-02 -7.72e-02 -1.14e-01 -2.89e-01 -3.14e-01 ph/cm2/s
90%_error_hi 1.70e-01 9.70e-02 7.69e-02 1.33e-01 2.89e-01 3.14e-01 ph/cm2/s
Fluence CPL 5.33e-08 9.70e-08 1.06e-07 8.81e-08 3.04e-07 3.44e-07 erg/cm2
90%_error_low -1.02e-08 -1.10e-08 -1.65e-08 -4.85e-08 -3.65e-08 -6.17e-08 erg/cm2
90%_error_hi 1.02e-08 1.13e-08 1.68e-08 1.22e-07 3.73e-08 1.23e-07 erg/cm2
Peak flux CPL 8.22e-01 1.07e+00 5.90e-01 1.20e-01 2.58e+00 2.60e+00 ph/cm2/s
90%_error_low -2.11e-01 -1.28e-01 -9.60e-02 -6.17e-02 -2.99e-01 -3.08e-01 ph/cm2/s
90%_error_hi 2.13e-01 1.31e-01 9.79e-02 1.08e-01 2.98e-01 3.12e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 355.3053 31.2928 0.0121 33.8017 -117.8780 0.5356779 15.858 TRIG_00579683 Foreground time interval of the image: -0.904 2.096 (delta_t = 3.000 [sec]) Background time interval of the image: -239.904 -0.904 (delta_t = 239.000 [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 -0.904 sec. to 2.096 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81095 ( -0.173656 0.166826 ) Norm@50keV : 1.14938E-02 ( -0.00125974 0.00123933 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.34 using 59 PHA bins. # Reduced chi-squared = 1.129 for 57 degrees of freedom # Null hypothesis probability = 2.351738e-01 Photon flux (15-150 keV) in 3 sec: 1.59068 ( -0.155 0.15513 ) ph/cm2/s Energy fluence (15-150 keV) : 3.17373e-07 ( -3.50532e-08 3.54372e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.904 sec. to 2.096 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11171 ( -0.657432 0.768168 ) Epeak [keV] : 60.9020 ( -14.3356 135.934 ) Norm@50keV : 2.67368E-02 ( -0.0143894 0.0389271 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.99 using 59 PHA bins. # Reduced chi-squared = 1.089 for 56 degrees of freedom # Null hypothesis probability = 3.011038e-01 Photon flux (15-150 keV) in 3 sec: 1.54810 ( -0.16095 0.16028 ) ph/cm2/s Energy fluence (15-150 keV) : 3.04221e-07 ( -3.65253e-08 3.73188e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.096 sec. to 1.096 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.80053 ( -0.174542 0.166993 ) Norm@50keV : 1.95373E-02 ( -0.00231169 0.00228194 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.45 using 59 PHA bins. # Reduced chi-squared = 1.113 for 57 degrees of freedom # Null hypothesis probability = 2.597171e-01 Photon flux (15-150 keV) in 1 sec: 2.69289 ( -0.28916 0.28937 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79887e-07 ( -2.15071e-08 2.16895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.096 sec. to 1.096 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.146561 ( -0.864314 1.06384 ) Epeak [keV] : 54.3888 ( -7.38311 11.6237 ) Norm@50keV : 0.140927 ( -0.0894009 0.335658 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.08 using 59 PHA bins. # Reduced chi-squared = 0.9122 for 56 degrees of freedom # Null hypothesis probability = 6.610477e-01 Photon flux (15-150 keV) in 1 sec: 2.57731 ( -0.29909 0.29794 ) ph/cm2/s Energy fluence (15-150 keV) : 1.6943e-07 ( -2.11304e-08 2.18238e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.0 sec. Hardness ratio (energy fluence ratio) = 1.14004017445
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.4872722e-07 S(50-150 keV) = 1.686474e-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 = -3.130452807927193E-01, IMY = 5.917884229788045E-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: -239.904000 -0.904000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 20.5598 -2.4743 2.8 38.4 168.7 1.1820 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.904000 2.096000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 51.5257 14.8077 2.1 23.5 102.1 0.1342 5.4 ------ UNKNOWN 50.0379 20.4834 2.4 18.2 95.2 0.1017 4.8 ------ UNKNOWN 355.3053 31.2928 0.7 33.8 -117.9 0.5357 15.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 70.596590 962.130200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1376 40.9552 1.1 38.8 -52.7 10.2615 10.8 1.3 Cyg X-3 326.1448 38.4101 12.1 24.9 -55.9 0.5748 1.0 5.5 Cyg X-2 33.3947 64.8508 3.3 40.9 33.0 3.2974 3.5 ------ UNKNOWN 317.8438 82.2054 2.7 52.7 3.4 5.7863 4.3 ------ UNKNOWN 345.0193 52.8183 3.0 22.8 -6.8 1.8147 3.8 ------ UNKNOWN 336.4192 64.2598 3.5 35.0 -4.8 2.1399 3.3 ------ UNKNOWN 351.0033 -27.6010 3.0 59.0 -166.1 12.8080 3.8 ------ UNKNOWN 315.2156 12.9315 4.0 41.1 -97.9 8.2562 2.9 ------ UNKNOWN 321.2466 1.0530 3.6 44.2 -117.1 6.9745 3.2 ------ UNKNOWN