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 20 01:13:48 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger313417
======================================================================
Trigger: 00313417 Segment: 000
BAT Trigger Time: 234511649.856 [s; MET]
Trigger Stop: 234511650.88 [s; MET]
UTC: 2008-06-07T06:07:27.008340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 194.967287472106 Dec: 15.9004689525493 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.87
Image Trigger?: NO
Rate S/N Ratio: 238.88490952758 [ if not an image trigger ]
Image S/N Ratio: 17.87
Analysis Position: [ source = BAT ]
RA: 194.967287472106 Dec: 15.9004689525493 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 194.96360541938 Dec: 15.9101271928674 [deg; J2000]
{ 12h 59m 51.3s , +15d 54' 36.5" }
+/- 0.896855558096024 [arcmin] (estimated 90% radius based on SNR)
+/- 0.286990466310308 [arcmin] (formal 1-sigma fit error)
SNR: 35.5351096657511
Angular difference between the analysis and refined position is 0.617216 arcmin
Partial Coding Fraction: 0.1113281 [ including projection effects ]
Duration
T90: 78.972000002861 +/- 3.04169689285327
Measured from: -2.99599999189377
to: 75.9760000109673 [s; relative to TRIGTIME]
T50: 22.5799999833107 +/- 1.68855913334988
Measured from: 1.70800000429153
to: 24.2879999876022 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.50400000810623
to: 2.50400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.96000000834465
to: 155.840000003576 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.651197 11.876875 11.482594 4.147420
0.132098 0.158146 0.160673 0.127372 [error]
Peak 0.369364 0.895090 1.165779 0.497568
0.028047 0.039659 0.047695 0.037801 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 161.800 -5.960 155.840
T90 78.972 -2.996 75.976
T50 22.580 1.708 24.288
Peak 1.000 1.504 2.504
====== 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 -1.241 -0.035 0.035 - - - 1.52e-02 -2.82e-04 2.82e-04 40.300 57
CPL -1.235 -0.036 0.034 9998.640 -9998.640 -9998.640 1.53e-02 -2.67e-04 1.07e-03 40.440 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 -0.805 -0.078 0.079 - - - 2.03e-01 -9.42e-03 9.38e-03 34.480 57
CPL -0.659 -0.180 0.310 552.387 -552.387 -552.387 2.35e-01 -2.34e-02 8.17e-02 33.760 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 2.47e-06 5.32e-06 9.01e-06 3.50e-05 2.47e-05 5.18e-05 erg/cm2
90%_error_low -1.01e-07 -1.27e-07 -1.79e-07 -1.66e-06 -4.57e-07 -1.72e-06 erg/cm2
90%_error_hi 1.03e-07 1.27e-07 1.78e-07 1.72e-06 4.58e-07 1.76e-06 erg/cm2
Peak flux PL 4.31e+00 6.57e+00 7.53e+00 1.65e+01 2.33e+01 3.49e+01 ph/cm2/s
90%_error_low -4.05e-01 -3.85e-01 -3.65e-01 -1.67e+00 -1.07e+00 -1.89e+00 ph/cm2/s
90%_error_hi 4.19e-01 3.82e-01 3.63e-01 1.79e+00 1.07e+00 1.94e+00 ph/cm2/s
Fluence CPL 2.47e-06 5.32e-06 8.94e-06 3.56e-05 2.47e-05 5.15e-05 erg/cm2
90%_error_low N/A -1.27e-07 N/A N/A -4.58e-07 -1.78e-06 erg/cm2
90%_error_hi N/A 1.27e-07 N/A N/A 4.57e-07 1.84e-06 erg/cm2
Peak flux CPL 1.07e-01 4.53e-02 6.73e-03 1.56e-02 5.53e-02 2.13e-01 ph/cm2/s
90%_error_low -1.07e-01 -4.53e-02 N/A -1.56e-02 -5.53e-02 -2.13e-01 ph/cm2/s
90%_error_hi 3.72e-01 6.43e-01 N/A 8.88e-02 1.99e-01 3.01e-02 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 194.9636 15.9101 0.0054 40.4736 123.2433 25.4126879 35.535 TRIG_00313417 Foreground time interval of the image: -5.960 11.845 (delta_t = 17.805 [sec]) Background time interval of the image: -239.856 -5.960 (delta_t = 233.896 [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 -5.960 sec. to 155.840 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.24061 ( -0.0349637 0.0351177 ) Norm@50keV : 1.52351E-02 ( -0.000282121 0.000281573 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.30 using 59 PHA bins. # Reduced chi-squared = 0.7071 for 57 degrees of freedom # Null hypothesis probability = 9.540284e-01 Photon flux (15-150 keV) in 161.8 sec: 1.79920 ( -0.03697 0.03719 ) ph/cm2/s Energy fluence (15-150 keV) : 2.47342e-05 ( -4.57009e-07 4.57556e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.960 sec. to 155.840 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23505 ( -0.0360805 0.0345535 ) Epeak [keV] : 9998.64 ( -9998.85 -9998.85 ) Norm@50keV : 1.52910E-02 ( -0.000277385 0.00105777 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.44 using 59 PHA bins. # Reduced chi-squared = 0.7221 for 56 degrees of freedom # Null hypothesis probability = 9.417214e-01 Photon flux (15-150 keV) in 161.8 sec: 0.774580 ( -0.068593 0.059965 ) ph/cm2/s Energy fluence (15-150 keV) : 2.47292e-05 ( -4.57582e-07 4.56773e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.504 sec. to 2.504 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.804616 ( -0.078049 0.0789062 ) Norm@50keV : 0.202804 ( -0.00941822 0.00938049 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 34.48 using 59 PHA bins. # Reduced chi-squared = 0.6049 for 57 degrees of freedom # Null hypothesis probability = 9.920607e-01 Photon flux (15-150 keV) in 1 sec: 23.3047 ( -1.067 1.0673 ) ph/cm2/s Energy fluence (15-150 keV) : 2.36559e-06 ( -1.19123e-07 1.19373e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.504 sec. to 2.504 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.658699 ( -0.179817 0.310059 ) Epeak [keV] : 552.387 ( -552.388 -552.388 ) Norm@50keV : 0.234559 ( -0.0233763 0.081674 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 33.76 using 59 PHA bins. # Reduced chi-squared = 0.6029 for 56 degrees of freedom # Null hypothesis probability = 9.918983e-01 Photon flux (15-150 keV) in 1 sec: 5.52952E-02 ( -0.0552952 0.199354 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35717e-06 ( -1.21591e-07 1.21222e-07 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 78.972 sec. Hardness ratio (energy fluence ratio) = 1.69281694548
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.79079e-06 S(50-150 keV) = 1.6943531e-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 = -4.677664989216760E-01, IMY = -7.136450700860668E-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: -239.856000 -5.960000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 146.9026 7.6799 2.9 53.4 -171.8 1.8031 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.960000 11.844600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 194.9636 15.9101 0.3 40.5 123.2 25.4095 35.5 ------ UNKNOWN 252.1039 43.0439 3.6 47.1 39.4 2.3282 3.2 ------ UNKNOWN 250.1350 45.4818 2.9 44.5 38.0 1.8868 4.0 ------ UNKNOWN 240.1347 50.6916 2.6 36.1 37.2 1.1630 4.4 ------ UNKNOWN 56.3247 72.6017 3.1 47.0 -53.1 1.2691 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.044600 962.180400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 194.9602 15.8976 1.9 0.0 121.1 2.9136 6.1 ------ UNKNOWN 152.1713 -25.9990 3.5 59.1 -166.1 11.5649 3.3 ------ UNKNOWN 168.1982 23.7763 5.0 26.3 -99.8 1.4071 2.3 ------ UNKNOWN 171.4489 63.9822 4.8 50.7 -44.5 6.4771 2.4 ------ UNKNOWN