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 00:38:37 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger316204
======================================================================
Trigger: 00316204 Segment: 000
BAT Trigger Time: 237112076.608 [s; MET]
Trigger Stop: 237112077.632 [s; MET]
UTC: 2008-07-07T08:27:53.685800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.6317294574555 Dec: 33.1030732163443 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 20.3715487874634 [ if not an image trigger ]
Image S/N Ratio: 9.84
Analysis Position: [ source = BAT ]
RA: 32.6317294574555 Dec: 33.1030732163443 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 32.6303811130433 Dec: 33.0954719512427 [deg; J2000]
{ 02h 10m 31.3s , +33d 05' 43.7" }
+/- 1.76966098708586 [arcmin] (estimated 90% radius based on SNR)
+/- 0.879125998861809 [arcmin] (formal 1-sigma fit error)
SNR: 13.4582843162208
Angular difference between the analysis and refined position is 0.461084 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 30.16400000453 +/- 2.40038662775393
Measured from: -1.21200001239777
to: 28.9519999921322 [s; relative to TRIGTIME]
T50: 23.8560000061989 +/- 1.09477489842058
Measured from: 0.739999979734421
to: 24.5959999859333 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.215999990701675
to: 1.21599999070168 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.82400000095367
to: 31.2679999768734 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.368913 0.434829 0.212560 0.044809
0.029981 0.031956 0.029835 0.030520 [error]
Peak 0.050128 0.049625 0.016348 0.011260
0.005857 0.006282 0.005619 0.005375 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 33.092 -1.824 31.268
T90 30.164 -1.212 28.952
T50 23.856 0.740 24.596
Peak 1.000 0.216 1.216
====== 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 -1.700 -0.172 0.167 - - - 2.04e-03 -2.09e-04 2.05e-04 47.670 57
CPL -1.701 -0.170 0.171 9999.360 -9999.350 -9999.360 2.04e-03 -1.22e-03 1.59e-03 47.670 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 -2.161 -0.309 0.279 - - - 6.51e-03 -1.41e-03 1.37e-03 44.360 57
CPL -1.397 -0.689 1.796 29.067 N/A N/A 1.95e-02 N/A N/A 43.480 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 1.04e-07 1.69e-07 2.09e-07 5.07e-07 6.26e-07 9.89e-07 erg/cm2
90%_error_low -1.41e-08 -1.46e-08 -2.95e-08 -1.34e-07 -6.71e-08 -1.64e-07 erg/cm2
90%_error_hi 1.45e-08 1.46e-08 2.98e-08 1.66e-07 6.87e-08 1.91e-07 erg/cm2
Peak flux PL 5.07e-01 3.46e-01 1.55e-01 9.60e-02 1.06e+00 1.10e+00 ph/cm2/s
90%_error_low -9.26e-02 -5.15e-02 -4.27e-02 -4.20e-02 -1.48e-01 -1.59e-01 ph/cm2/s
90%_error_hi 9.48e-02 5.09e-02 4.52e-02 5.91e-02 1.48e-01 1.61e-01 ph/cm2/s
Fluence CPL 1.04e-07 1.68e-07 2.09e-07 5.05e-07 6.29e-07 9.96e-07 erg/cm2
90%_error_low N/A N/A N/A N/A -6.84e-08 -3.46e-07 erg/cm2
90%_error_hi N/A N/A N/A N/A 6.97e-08 8.41e-08 erg/cm2
Peak flux CPL 5.04e-01 3.48e-01 1.53e-01 8.28e-02 1.06e+00 1.10e+00 ph/cm2/s
90%_error_low -1.21e-01 -1.04e-01 -4.65e-02 N/A -1.51e-01 -1.48e-01 ph/cm2/s
90%_error_hi 8.50e-02 4.95e-02 5.46e-02 N/A 1.45e-01 1.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 32.6304 33.0955 0.0143 19.2871 -40.0940 0.6199919 13.458 TRIG_00316204 Foreground time interval of the image: -1.824 16.293 (delta_t = 18.117 [sec]) Background time interval of the image: -636.507 -585.570 (delta_t = 50.938 [sec]) -239.608 -1.824 (delta_t = 237.784 [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 -1.824 sec. to 31.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69979 ( -0.17169 0.1675 ) Norm@50keV : 2.04209E-03 ( -0.000208637 0.000204732 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.67 using 59 PHA bins. # Reduced chi-squared = 0.8363 for 57 degrees of freedom # Null hypothesis probability = 8.061141e-01 Photon flux (15-150 keV) in 33.09 sec: 0.271203 ( -0.023494 0.0235 ) ph/cm2/s Energy fluence (15-150 keV) : 6.25745e-07 ( -6.71118e-08 6.86981e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.824 sec. to 31.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70102 ( -0.170282 0.170624 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 2.04390E-03 ( -0.00121926 0.00159118 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.67 using 59 PHA bins. # Reduced chi-squared = 0.8513 for 56 degrees of freedom # Null hypothesis probability = 7.781662e-01 Photon flux (15-150 keV) in 33.09 sec: 0.271183 ( -0.023493 0.023498 ) ph/cm2/s Energy fluence (15-150 keV) : 6.28819e-07 ( -6.84467e-08 6.97137e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.216 sec. to 1.216 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.16129 ( -0.309117 0.278722 ) Norm@50keV : 6.50591E-03 ( -0.00140518 0.0013704 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.36 using 59 PHA bins. # Reduced chi-squared = 0.7783 for 57 degrees of freedom # Null hypothesis probability = 8.889489e-01 Photon flux (15-150 keV) in 1 sec: 1.05572 ( -0.148057 0.14812 ) ph/cm2/s Energy fluence (15-150 keV) : 6.08681e-08 ( -1.11356e-08 1.16974e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.216 sec. to 1.216 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39705 ( -0.690812 1.79423 ) Epeak [keV] : 29.0665 ( ) Norm@50keV : 1.95099E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.48 using 59 PHA bins. # Reduced chi-squared = 0.7765 for 56 degrees of freedom # Null hypothesis probability = 8.888430e-01 Photon flux (15-150 keV) in 1 sec: 1.05927 ( -0.150936 0.14535 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 30.164 sec. Hardness ratio (energy fluence ratio) = 1.23137435498
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.734827e-07 S(50-150 keV) = 3.522628e-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 = 2.677019575204110E-01, IMY = 2.253784437098540E-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: -636.507400 -585.569600 -239.608000 -1.824000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 307.9342 40.9729 20.1 46.1 141.8 0.4543 0.6 8.1 Cyg X-3 326.1016 38.3365 33.8 34.0 130.1 0.1378 0.3 3.4 Cyg X-2 272.9198 65.4037 3.2 55.8 -179.3 3.9250 3.6 ------ UNKNOWN 8.8265 80.8650 2.1 39.2 -149.9 1.7650 5.4 ------ UNKNOWN 41.5889 81.9535 2.5 41.6 -143.2 1.6565 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.824000 16.292600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1021 40.9617 145.9 46.0 141.7 -0.0126 -0.1 0.7 Cyg X-3 326.1725 38.3242 49.0 34.0 130.1 -0.0186 -0.2 0.2 Cyg X-2 327.1518 34.1392 1.9 34.9 122.7 0.5568 6.1 ------ UNKNOWN 32.6304 33.0954 0.9 19.3 -40.1 0.6200 13.5 ------ UNKNOWN 59.6829 9.1203 2.4 53.8 -36.6 1.2843 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 57.092590 653.292590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 358.7273 8.0858 2.6 40.1 71.0 5.8968 4.4 491.1 UNKNOWN