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 13 17:11:57 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger509543
======================================================================
Trigger: 00509543 Segment: 000
BAT Trigger Time: 345374594.752 [s; MET]
Trigger Stop: 345374602.944 [s; MET]
UTC: 2011-12-12T09:23:07.084300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 310.404448660982 Dec: -68.6171052622876 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 8.48528137423857 [ if not an image trigger ]
Image S/N Ratio: 8.09
Analysis Position: [ source = BAT ]
RA: 310.404448660982 Dec: -68.6171052622876 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 310.441694517769 Dec: -68.5848822181666 [deg; J2000]
{ 20h 41m 46.0s , -68d 35' 05.6" }
+/- 1.75420619468349 [arcmin] (estimated 90% radius based on SNR)
+/- 0.797385353897873 [arcmin] (formal 1-sigma fit error)
SNR: 13.6279882662972
Angular difference between the analysis and refined position is 2.098285 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 56.3040000200272 +/- 9.35030263976235
Measured from: -1.76799994707108
to: 54.5360000729561 [s; relative to TRIGTIME]
T50: 25.37600004673 +/- 7.66085948001888
Measured from: 6.56800001859665
to: 31.9440000653267 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.76399999856949
to: 5.76399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.76799994707108
to: 62.6480000019073 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.520401 0.911580 0.605690 0.109234
0.080800 0.081669 0.070896 0.060597 [error]
Peak 0.030856 0.039079 0.026402 0.020402
0.010404 0.010291 0.008912 0.007820 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 68.416 -5.768 62.648
T90 56.304 -1.768 54.536
T50 25.376 6.568 31.944
Peak 1.000 4.764 5.764
====== 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 -1.628 -0.187 0.183 - - - 2.17e-03 -2.46e-04 2.44e-04 55.050 57
CPL -0.877 -0.797 0.996 71.096 -18.849 -71.096 5.39e-03 -3.27e-03 1.25e-02 52.510 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 -1.689 -0.590 0.559 - - - 6.22e-03 -2.16e-03 2.07e-03 65.850 57
CPL -1.476 -0.923 2.436 111.316 -111.306 -111.316 8.16e-03 -8.16e-03 2.24e-01 65.870 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 2.14e-07 3.64e-07 4.71e-07 1.23e-06 1.39e-06 2.28e-06 erg/cm2
90%_error_low -3.67e-08 -4.03e-08 -6.94e-08 -3.40e-07 -1.66e-07 -4.08e-07 erg/cm2
90%_error_hi 3.83e-08 4.02e-08 6.92e-08 4.16e-07 1.68e-07 4.66e-07 erg/cm2
Peak flux PL 3.07e-01 2.76e-01 1.71e-01 1.62e-01 8.23e-01 9.17e-01 ph/cm2/s
90%_error_low -1.44e-01 -8.92e-02 -7.41e-02 -1.05e-01 -2.59e-01 -2.86e-01 ph/cm2/s
90%_error_hi 1.61e-01 8.77e-02 7.38e-02 1.84e-01 2.60e-01 2.88e-01 ph/cm2/s
Fluence CPL 1.92e-07 3.95e-07 4.84e-07 4.34e-07 1.31e-06 1.51e-06 erg/cm2
90%_error_low -4.36e-08 -5.22e-08 -7.78e-08 -2.80e-07 -1.88e-07 -3.39e-07 erg/cm2
90%_error_hi 4.45e-08 5.49e-08 7.75e-08 8.92e-07 1.89e-07 8.67e-07 erg/cm2
Peak flux CPL 3.05e-01 2.78e-01 1.72e-01 1.51e-01 8.22e-01 9.06e-01 ph/cm2/s
90%_error_low -1.60e-01 -8.92e-02 N/A -1.51e-01 -2.64e-01 -3.32e-01 ph/cm2/s
90%_error_hi 1.64e-01 1.14e-01 N/A 1.05e-01 2.61e-01 2.94e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 310.4417 -68.5849 0.0141 36.2066 -58.8916 2.0917704 13.628 TRIG_00509543 Foreground time interval of the image: -5.768 47.149 (delta_t = 52.917 [sec]) Background time interval of the image: -239.752 -5.768 (delta_t = 233.984 [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 -5.768 sec. to 62.648 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62767 ( -0.18673 0.183353 ) Norm@50keV : 2.17482E-03 ( -0.000246178 0.000244095 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.05 using 59 PHA bins. # Reduced chi-squared = 0.9658 for 57 degrees of freedom # Null hypothesis probability = 5.486172e-01 Photon flux (15-150 keV) in 68.42 sec: 0.281933 ( -0.030989 0.031047 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38734e-06 ( -1.66037e-07 1.67743e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.768 sec. to 62.648 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.877258 ( -0.796516 0.996073 ) Epeak [keV] : 71.0957 ( -18.8478 -71.095 ) Norm@50keV : 5.39245E-03 ( -0.00327457 0.0125144 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.51 using 59 PHA bins. # Reduced chi-squared = 0.9377 for 56 degrees of freedom # Null hypothesis probability = 6.077860e-01 Photon flux (15-150 keV) in 68.42 sec: 0.273232 ( -0.032556 0.032428 ) ph/cm2/s Energy fluence (15-150 keV) : 1.30624e-06 ( -1.87568e-07 1.8942e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.764 sec. to 5.764 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.68945 ( -0.590093 0.559221 ) Norm@50keV : 6.22025E-03 ( -0.00216004 0.00206579 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.85 using 59 PHA bins. # Reduced chi-squared = 1.155 for 57 degrees of freedom # Null hypothesis probability = 1.974067e-01 Photon flux (15-150 keV) in 1 sec: 0.823132 ( -0.259183 0.260018 ) ph/cm2/s Energy fluence (15-150 keV) : 5.76501e-08 ( -2.01364e-08 2.08662e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.764 sec. to 5.764 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66284 ( -0.905529 2.45414 ) Epeak [keV] : 571.511 ( -534.385 -534.395 ) Norm@50keV : 6.43350E-03 ( -0.00646639 0.225826 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.84 using 59 PHA bins. # Reduced chi-squared = 1.176 for 56 degrees of freedom # Null hypothesis probability = 1.728648e-01 Photon flux (15-150 keV) in 1 sec: 0.821843 ( -0.263722 0.260587 ) ph/cm2/s Energy fluence (15-150 keV) : 5.73971e-08 ( -2.27074e-08 2.09585e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 56.304 sec. Hardness ratio (energy fluence ratio) = 1.29446448781
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.783388e-07 S(50-150 keV) = 8.090201e-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 = 3.782290248953952E-01, IMY = 6.267895714224447E-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: -239.752000 -5.768000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5362 -40.5629 0.8 42.2 168.4 5.5647 14.4 0.6 Vela X-1 170.3919 -60.6278 1.8 36.0 -145.3 1.6942 6.4 2.3 Cen X-3 186.7725 -62.6251 9.5 38.5 -132.7 0.4009 1.2 9.3 GX 301-2 91.9995 -52.5704 2.7 19.4 121.4 0.8830 4.2 ------ UNKNOWN 18.0342 -36.8426 2.5 45.0 17.4 1.8223 4.7 ------ UNKNOWN 356.7936 -31.1575 2.9 57.2 -0.5 4.7676 4.0 ------ UNKNOWN 190.5762 -51.0674 3.6 49.8 -137.5 2.5570 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.768000 47.148600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6372 -40.6321 7.4 42.1 168.6 -0.2361 -1.6 6.8 Vela X-1 170.5531 -60.6784 4.1 36.0 -145.2 -0.3287 -2.8 7.7 Cen X-3 186.2577 -62.6923 6.9 38.3 -133.0 0.2430 1.7 11.9 GX 301-2 310.4417 -68.5849 0.8 36.2 -58.9 2.0921 13.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 239.748610 962.294300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 70.3934 35.2974 3.0 32.2 90.9 2.9173 3.9 ------ UNKNOWN 46.5450 22.4567 2.7 39.0 132.0 4.3713 4.4 ------ UNKNOWN 95.4736 50.7263 2.3 31.6 45.1 2.9995 5.0 ------ UNKNOWN 36.4537 44.7068 3.3 16.6 150.6 1.3072 3.5 ------ UNKNOWN 36.2596 55.4695 3.0 6.1 162.6 1.4445 3.8 ------ UNKNOWN 24.8437 77.8700 2.4 17.4 -49.2 1.8848 4.9 ------ UNKNOWN 356.1527 11.4217 3.0 59.1 -166.1 10.7074 3.8 ------ UNKNOWN 339.0940 30.3813 4.1 49.9 -137.8 5.7403 2.8 ------ UNKNOWN 267.8779 69.6385 3.2 44.9 -60.0 7.7377 3.6 ------ UNKNOWN 327.9690 44.7895 3.3 43.8 -116.1 6.8935 3.5 ------ UNKNOWN