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 Oct 4 20:43:27 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger611933
======================================================================
Trigger: 00611933 Segment: 000
BAT Trigger Time: 431798841.344 [s; MET]
Trigger Stop: 431798842.368 [s; MET]
UTC: 2014-09-07T16:07:08.847220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.1471898036904 Dec: 46.5950777481444 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.32
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 7.32
Analysis Position: [ source = BAT ]
RA: 48.1471898036904 Dec: 46.5950777481444 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 48.1307777652394 Dec: 46.5969596111044 [deg; J2000]
{ 03h 12m 31.4s , +46d 35' 49.1" }
+/- 1.27286921916771 [arcmin] (estimated 90% radius based on SNR)
+/- 0.366429682612389 [arcmin] (formal 1-sigma fit error)
SNR: 21.5490068604448
Angular difference between the analysis and refined position is 0.685996 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 80 +/- 35.7770876399966
Measured from: -63.3439999818802
to: 16.6560000181198 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.656000018119812
to: 16.6560000181198 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.15600001811981
to: 9.15600001811981 [s; relative to TRIGTIME]
Total Fluence
Measured from: -95.3439999818802
to: 48.6560000181198 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.014879 2.746206 1.932812 0.480167
0.081574 0.085266 0.075033 0.064631 [error]
Peak 0.041944 0.064708 0.065445 0.006884
0.007739 0.008233 0.007629 0.006162 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 144.000 -95.344 48.656
T90 80.000 -63.344 16.656
T50 16.000 0.656 16.656
Peak 1.000 8.156 9.156
====== 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 -1.650 -0.070 0.070 - - - 3.37e-03 -1.29e-04 1.29e-04 39.050 57
CPL -1.422 -0.255 0.290 129.600 -45.759 -129.600 4.36e-03 -1.05e-03 1.64e-03 37.010 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 -1.325 -0.213 0.213 - - - 1.31e-02 -1.66e-03 1.66e-03 59.410 57
CPL -0.539 -0.852 1.074 100.152 -31.066 -100.152 3.08e-02 -1.83e-02 6.35e-02 57.020 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 7.14e-07 1.20e-06 1.52e-06 3.89e-06 4.51e-06 7.33e-06 erg/cm2
90%_error_low -4.86e-08 -4.84e-08 -7.64e-08 -4.13e-07 -1.82e-07 -4.69e-07 erg/cm2
90%_error_hi 4.97e-08 4.82e-08 7.62e-08 4.46e-07 1.82e-07 4.93e-07 erg/cm2
Peak flux PL 4.56e-01 5.09e-01 4.06e-01 5.38e-01 1.57e+00 1.91e+00 ph/cm2/s
90%_error_low -1.01e-01 -7.31e-02 -6.12e-02 -1.50e-01 -2.04e-01 -2.48e-01 ph/cm2/s
90%_error_hi 1.08e-01 7.21e-02 6.04e-02 1.81e-01 2.05e-01 2.50e-01 ph/cm2/s
Fluence CPL 6.82e-07 1.22e-06 1.55e-06 2.79e-06 4.44e-06 6.24e-06 erg/cm2
90%_error_low -6.03e-08 -5.53e-08 -8.15e-08 -8.77e-07 -2.05e-07 -8.97e-07 erg/cm2
90%_error_hi 6.14e-08 5.60e-08 8.24e-08 1.23e-06 2.04e-07 1.23e-06 erg/cm2
Peak flux CPL 3.82e-01 5.38e-01 4.41e-01 2.65e-01 1.52e+00 1.63e+00 ph/cm2/s
90%_error_low -1.25e-01 -8.29e-02 -7.30e-02 -1.41e-01 -2.13e-01 -2.67e-01 ph/cm2/s
90%_error_hi 1.33e-01 8.53e-02 7.56e-02 3.31e-01 2.12e-01 3.73e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 48.1308 46.5970 0.0089 36.8949 -161.2651 3.8271016 21.549 TRIG_00611933 Foreground time interval of the image: -95.344 12.757 (delta_t = 108.101 [sec]) Background time interval of the image: -239.344 -95.344 (delta_t = 144.000 [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 -95.344 sec. to 48.656 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65033 ( -0.0702703 0.0699237 ) Norm@50keV : 3.37030E-03 ( -0.000129108 0.000128759 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.05 using 59 PHA bins. # Reduced chi-squared = 0.6851 for 57 degrees of freedom # Null hypothesis probability = 9.667498e-01 Photon flux (15-150 keV) in 144 sec: 0.440143 ( -0.017715 0.017763 ) ph/cm2/s Energy fluence (15-150 keV) : 4.51421e-06 ( -1.81673e-07 1.82051e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -95.344 sec. to 48.656 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.42189 ( -0.255302 0.290071 ) Epeak [keV] : 129.600 ( -45.7595 -129.601 ) Norm@50keV : 4.36149E-03 ( -0.00104961 0.00164133 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.01 using 59 PHA bins. # Reduced chi-squared = 0.6610 for 56 degrees of freedom # Null hypothesis probability = 9.764055e-01 Photon flux (15-150 keV) in 144 sec: 0.433583 ( -0.019272 0.019324 ) ph/cm2/s Energy fluence (15-150 keV) : 4.4356e-06 ( -2.05095e-07 2.04124e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.156 sec. to 9.156 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32474 ( -0.212526 0.212822 ) Norm@50keV : 1.30955E-02 ( -0.00166156 0.00165896 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.41 using 59 PHA bins. # Reduced chi-squared = 1.042 for 57 degrees of freedom # Null hypothesis probability = 3.880181e-01 Photon flux (15-150 keV) in 1 sec: 1.56969 ( -0.20404 0.20455 ) ph/cm2/s Energy fluence (15-150 keV) : 1.28659e-07 ( -1.78666e-08 1.80106e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.156 sec. to 9.156 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.538887 ( -0.852047 1.07448 ) Epeak [keV] : 100.152 ( -31.066 -100.152 ) Norm@50keV : 3.08472E-02 ( -0.0182766 0.0634647 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.02 using 59 PHA bins. # Reduced chi-squared = 1.018 for 56 degrees of freedom # Null hypothesis probability = 4.371034e-01 Photon flux (15-150 keV) in 1 sec: 1.52007 ( -0.21273 0.21205 ) ph/cm2/s Energy fluence (15-150 keV) : 1.23572e-07 ( -1.89676e-08 1.90347e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 80.0 sec. Hardness ratio (energy fluence ratio) = 1.27429545154
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.9102932e-06 S(50-150 keV) = 2.603876e-06
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 = -7.109073642563704E-01, IMY = 2.411111187205032E-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: -239.344000 -95.344000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 358.7980 16.9125 2.7 40.9 113.8 2.2430 4.3 ------ UNKNOWN 29.5743 -21.5171 3.0 33.5 28.2 0.6824 3.8 ------ UNKNOWN 43.2811 57.4362 3.1 47.2 -168.0 1.0053 3.7 ------ UNKNOWN 53.5895 21.6029 2.8 17.0 -123.5 0.5598 4.2 ------ UNKNOWN 81.5929 41.9568 2.4 47.9 -128.9 3.0697 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -95.344000 12.756600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 48.1308 46.5970 0.5 36.9 -161.3 3.8275 21.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 72.156620 519.756600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6328 22.0234 0.3 37.7 -36.4 18.6209 35.7 0.5 Crab 2.9568 27.0550 4.4 40.4 102.5 4.4690 2.6 ------ UNKNOWN 58.9305 2.2872 2.3 45.3 10.0 3.2380 5.1 ------ UNKNOWN 337.3386 68.2832 3.8 40.7 172.8 1.8277 3.0 ------ UNKNOWN 261.7502 73.7079 2.3 57.5 -165.4 8.9627 5.1 ------ UNKNOWN 142.6123 71.0267 2.4 48.0 -128.9 7.2069 4.8 ------ UNKNOWN