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 22:31:16 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger576238
======================================================================
Trigger: 00576238 Segment: 000
BAT Trigger Time: 404859390.016 [s; MET]
Trigger Stop: 404859391.04 [s; MET]
UTC: 2013-10-30T20:56:18.801700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 345.079654263905 Dec: -5.38921581867925 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.38
Image Trigger?: NO
Rate S/N Ratio: 126.435754436789 [ if not an image trigger ]
Image S/N Ratio: 21.38
Analysis Position: [ source = BAT ]
RA: 345.079654263905 Dec: -5.38921581867925 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 345.074259018885 Dec: -5.37913552189258 [deg; J2000]
{ 23h 00m 17.8s , -05d 22' 44.9" }
+/- 0.546643469240952 [arcmin] (estimated 90% radius based on SNR)
+/- 0.193036441606166 [arcmin] (formal 1-sigma fit error)
SNR: 72.0819815856813
Angular difference between the analysis and refined position is 0.685327 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 39.4239999651909 +/- 3.6748333110245
Measured from: -2.25199997425079
to: 37.1719999909401 [s; relative to TRIGTIME]
T50: 8.40799999237061 +/- 0.232551075483291
Measured from: 3.94400000572205
to: 12.3519999980927 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.40000003576279
to: 7.40000003576279 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.50399994850159
to: 143.368000030518 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.412478 14.650115 13.635780 3.925338
0.103307 0.118905 0.117358 0.103875 [error]
Peak 0.545847 1.158875 1.309875 0.440530
0.019166 0.026285 0.028318 0.020492 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 148.872 -5.504 143.368
T90 39.424 -2.252 37.172
T50 8.408 3.944 12.352
Peak 1.000 6.400 7.400
====== 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 -1.292 -0.027 0.027 - - - 1.98e-02 -2.91e-04 2.91e-04 36.430 57
CPL -1.162 -0.110 0.113 404.430 -156.329 1542.080 2.23e-02 -2.08e-03 2.36e-03 32.370 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -0.959 -0.045 0.045 - - - 2.44e-01 -6.42e-03 6.41e-03 83.400 57
CPL -0.585 -0.183 0.191 229.293 -56.764 153.248 3.52e-01 -5.60e-02 6.92e-02 70.760 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 3.10e-06 6.46e-06 1.05e-05 3.88e-05 2.91e-05 5.89e-05 erg/cm2
90%_error_low -1.02e-07 -1.25e-07 -1.57e-07 -1.38e-06 -4.09e-07 -1.41e-06 erg/cm2
90%_error_hi 1.03e-07 1.25e-07 1.57e-07 1.42e-06 4.08e-07 1.44e-06 erg/cm2
Peak flux PL 6.01e+00 8.35e+00 8.59e+00 1.62e+01 2.81e+01 3.91e+01 ph/cm2/s
90%_error_low -3.27e-01 -2.80e-01 -2.34e-01 -9.36e-01 -7.48e-01 -1.10e+00 ph/cm2/s
90%_error_hi 3.34e-01 2.79e-01 2.33e-01 9.72e-01 7.49e-01 1.10e+00 ph/cm2/s
Fluence CPL 2.96e-06 6.47e-06 1.07e-05 3.37e-05 2.90e-05 5.38e-05 erg/cm2
90%_error_low -1.45e-07 -1.26e-07 -2.01e-07 -3.76e-06 -4.29e-07 -3.75e-06 erg/cm2
90%_error_hi 1.48e-07 1.26e-07 2.02e-07 4.34e-06 4.28e-07 4.32e-06 erg/cm2
Peak flux CPL 5.37e+00 8.46e+00 9.02e+00 1.16e+01 2.77e+01 3.44e+01 ph/cm2/s
90%_error_low -4.25e-01 -2.95e-01 -3.08e-01 -1.67e+00 -7.70e-01 -1.85e+00 ph/cm2/s
90%_error_hi 4.37e-01 2.96e-01 3.10e-01 2.03e+00 7.71e-01 2.15e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 345.0743 -5.3791 0.0027 32.5726 132.5131 31.5073645 72.082 TRIG_00576238 Foreground time interval of the image: -5.504 12.085 (delta_t = 17.589 [sec]) Background time interval of the image: -184.915 -5.504 (delta_t = 179.411 [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 -5.504 sec. to 143.368 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29237 ( -0.0269513 0.0270263 ) Norm@50keV : 1.97692E-02 ( -0.000291084 0.000290653 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.43 using 59 PHA bins. # Reduced chi-squared = 0.6391 for 57 degrees of freedom # Null hypothesis probability = 9.845989e-01 Photon flux (15-150 keV) in 148.9 sec: 2.35526 ( -0.03988 0.04002 ) ph/cm2/s Energy fluence (15-150 keV) : 2.91464e-05 ( -4.08552e-07 4.08142e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.504 sec. to 143.368 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16186 ( -0.110094 0.112738 ) Epeak [keV] : 404.430 ( -156.459 1541.95 ) Norm@50keV : 2.22747E-02 ( -0.00208388 0.0023569 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 32.37 using 59 PHA bins. # Reduced chi-squared = 0.5780 for 56 degrees of freedom # Null hypothesis probability = 9.952403e-01 Photon flux (15-150 keV) in 148.9 sec: 2.32835 ( -0.0452 0.0455 ) ph/cm2/s Energy fluence (15-150 keV) : 2.89911e-05 ( -4.28728e-07 4.28332e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.400 sec. to 7.400 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.959001 ( -0.0448149 0.0450581 ) Norm@50keV : 0.244432 ( -0.00641878 0.00640943 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 83.40 using 59 PHA bins. # Reduced chi-squared = 1.463 for 57 degrees of freedom # Null hypothesis probability = 1.289297e-02 Photon flux (15-150 keV) in 1 sec: 28.0909 ( -0.7485 0.749 ) ph/cm2/s Energy fluence (15-150 keV) : 2.68293e-06 ( -7.37142e-08 7.37097e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.400 sec. to 7.400 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.584711 ( -0.183153 0.190692 ) Epeak [keV] : 229.293 ( -56.7642 153.248 ) Norm@50keV : 0.351735 ( -0.0560477 0.0692425 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.76 using 59 PHA bins. # Reduced chi-squared = 1.264 for 56 degrees of freedom # Null hypothesis probability = 8.853009e-02 Photon flux (15-150 keV) in 1 sec: 27.6842 ( -0.7699 0.771 ) ph/cm2/s Energy fluence (15-150 keV) : 2.65399e-06 ( -7.61854e-08 7.60562e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 39.424 sec. Hardness ratio (energy fluence ratio) = 1.63316555297
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.554608e-06 S(50-150 keV) = 1.9591959e-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 = -4.317096005067170E-01, IMY = -4.709127232910389E-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: -184.915400 -5.504000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7967 10.9656 1.0 29.0 -83.2 3.2781 11.4 1.2 GRS 1915+105 299.7585 35.2146 3.7 27.4 -25.9 0.6775 3.1 8.3 Cyg X-1 308.1193 40.9394 1.4 28.8 -7.6 1.8057 8.2 0.9 Cyg X-3 326.1099 38.4276 3.3 25.8 22.6 0.7707 3.5 7.0 Cyg X-2 358.5619 6.1894 2.0 40.2 105.2 4.4192 5.7 381.2 UNKNOWN 313.0938 58.2277 2.0 44.8 4.7 2.0440 5.8 ------ UNKNOWN 317.8845 -34.7115 2.6 48.3 -170.8 1.7114 4.4 ------ UNKNOWN 297.3943 30.2143 1.0 25.5 -37.3 2.5002 12.1 ------ UNKNOWN 276.5581 10.4018 2.7 41.0 -81.1 3.6728 4.3 ------ UNKNOWN 286.2437 -24.1716 2.9 49.1 -131.4 3.7785 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.504000 12.084600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.6737 10.8187 32.1 29.2 -83.5 -0.0950 -0.4 10.6 GRS 1915+105 299.6769 35.1359 9.0 27.4 -26.2 -0.3193 -1.3 5.8 Cyg X-1 308.0805 40.9057 66.1 28.8 -7.7 0.0441 0.2 3.1 Cyg X-3 326.2459 38.1768 43.9 25.6 23.1 -0.0710 -0.3 9.4 Cyg X-2 347.0646 -20.2714 3.0 44.1 148.3 2.8106 3.9 ------ UNKNOWN 345.0743 -5.3791 0.2 32.6 132.5 31.5048 72.1 ------ UNKNOWN 304.3306 61.1017 2.8 48.6 -0.4 2.0369 4.1 ------ UNKNOWN 287.7227 57.8495 3.2 49.9 -12.1 1.6778 3.7 ------ UNKNOWN 289.0871 -29.7443 2.8 51.7 -138.6 3.2246 4.1 ------ UNKNOWN 279.3776 -0.2760 4.5 41.1 -97.9 2.0880 2.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 67.284660 963.079300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6048 35.1610 3.9 58.9 -20.8 10.9263 3.0 2.5 Cyg X-1 308.1618 41.0038 4.3 57.4 -10.4 7.9868 2.7 3.9 Cyg X-3 326.2341 38.2690 5.7 47.0 1.9 2.2096 2.0 4.3 Cyg X-2 16.9506 15.9820 2.5 38.1 77.5 9.2021 4.6 ------ UNKNOWN 6.2787 23.0788 2.5 35.2 57.4 5.1988 4.5 ------ UNKNOWN 345.0583 -5.4278 2.3 0.1 -155.9 2.8339 5.0 ------ UNKNOWN 336.2429 -53.7329 3.0 48.9 -150.9 5.9247 3.8 ------ UNKNOWN 306.7380 -23.5614 3.9 41.1 -98.0 11.2085 3.0 ------ UNKNOWN