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: Thu Apr 14 18:17:21 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger680655
======================================================================
Trigger: 00680655 Segment: 000
BAT Trigger Time: 480762983.744 [s; MET]
Trigger Stop: 480762984.768 [s; MET]
UTC: 2016-03-27T09:16:07.705440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 146.689296300309 Dec: 54.0168224464118 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: NO
Rate S/N Ratio: 12.0830459735946 [ if not an image trigger ]
Image S/N Ratio: 7.6
Analysis Position: [ source = BAT ]
RA: 146.689296300309 Dec: 54.0168224464118 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 146.699034533957 Dec: 54.0165959499338 [deg; J2000]
{ 09h 46m 47.8s , +54d 00' 59.7" }
+/- 0.934814962001397 [arcmin] (estimated 90% radius based on SNR)
+/- 0.306321805393869 [arcmin] (formal 1-sigma fit error)
SNR: 33.4918296158038
Angular difference between the analysis and refined position is 0.343570 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 33.7440000772476 +/- 9.37472005275709
Measured from: -3.31200003623962
to: 30.432000041008 [s; relative to TRIGTIME]
T50: 9.82400000095367 +/- 1.28369467868782
Measured from: 3.08799999952316
to: 12.9120000004768 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.283999979496
to: 6.283999979496 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.36800003051758
to: 42.8479999899864 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.918166 0.911110 0.590095 0.089779
0.040204 0.041843 0.036430 0.032142 [error]
Peak 0.056060 0.084119 0.058107 0.010007
0.006750 0.007279 0.006362 0.004947 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 49.216 -6.368 42.848
T90 33.744 -3.312 30.432
T50 9.824 3.088 12.912
Peak 1.000 5.284 6.284
====== 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 -1.837 -0.107 0.105 - - - 3.01e-03 -1.81e-04 1.79e-04 50.970 57
CPL -1.839 -0.105 0.362 9999.360 -9999.350 -9999.360 3.01e-03 -1.78e-04 1.61e-03 50.970 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 -1.568 -0.170 0.166 - - - 1.33e-02 -1.42e-03 1.40e-03 70.500 57
CPL -1.035 -0.604 0.761 86.667 -27.750 -86.667 2.55e-02 -1.29e-02 3.78e-02 68.550 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 2.60e-07 3.90e-07 4.36e-07 9.25e-07 1.36e-06 2.01e-06 erg/cm2
90%_error_low -2.26e-08 -2.06e-08 -3.66e-08 -1.55e-07 -8.24e-08 -1.88e-07 erg/cm2
90%_error_hi 2.32e-08 2.06e-08 3.67e-08 1.75e-07 8.32e-08 2.04e-07 erg/cm2
Peak flux PL 5.86e-01 5.66e-01 3.82e-01 4.03e-01 1.70e+00 1.94e+00 ph/cm2/s
90%_error_low -9.04e-02 -5.75e-02 -5.17e-02 -9.87e-02 -1.68e-01 -1.96e-01 ph/cm2/s
90%_error_hi 9.38e-02 5.73e-02 5.14e-02 1.16e-01 1.68e-01 1.98e-01 ph/cm2/s
Fluence CPL 2.61e-07 3.88e-07 4.36e-07 9.59e-07 1.37e-06 2.06e-06 erg/cm2
90%_error_low -2.85e-08 -2.00e-08 -3.91e-08 -4.60e-07 -1.07e-07 -4.83e-07 erg/cm2
90%_error_hi 2.39e-08 2.51e-08 4.18e-08 -1.28e-08 4.64e-08 1.48e-07 erg/cm2
Peak flux CPL 5.42e-01 6.01e-01 3.96e-01 2.18e-01 1.67e+00 1.76e+00 ph/cm2/s
90%_error_low -1.06e-01 -7.11e-02 -5.67e-02 -1.15e-01 -1.73e-01 -2.14e-01 ph/cm2/s
90%_error_hi 1.08e-01 7.38e-02 5.79e-02 2.21e-01 1.72e-01 2.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 146.6990 54.0166 0.0058 16.4979 -85.7565 1.7033262 33.492 TRIG_00680655 Foreground time interval of the image: -6.368 10.757 (delta_t = 17.125 [sec]) Background time interval of the image: -239.744 -6.368 (delta_t = 233.376 [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 -6.368 sec. to 42.848 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83706 ( -0.106543 0.104571 ) Norm@50keV : 3.01458E-03 ( -0.000181041 0.000179074 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.97 using 59 PHA bins. # Reduced chi-squared = 0.8941 for 57 degrees of freedom # Null hypothesis probability = 6.996287e-01 Photon flux (15-150 keV) in 49.22 sec: 0.421547 ( -0.022809 0.022866 ) ph/cm2/s Energy fluence (15-150 keV) : 1.36481e-06 ( -8.2412e-08 8.32035e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.368 sec. to 42.848 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83888 ( -0.105452 0.361436 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 3.01371E-03 ( -0.000180536 0.0016033 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.97 using 59 PHA bins. # Reduced chi-squared = 0.9102 for 56 degrees of freedom # Null hypothesis probability = 6.652627e-01 Photon flux (15-150 keV) in 49.22 sec: 0.422462 ( -0.026179 0.023149 ) ph/cm2/s Energy fluence (15-150 keV) : 1.36959e-06 ( -1.0677e-07 4.63712e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.284 sec. to 6.284 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56789 ( -0.17025 0.166225 ) Norm@50keV : 1.33309E-02 ( -0.00141656 0.00140132 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.50 using 59 PHA bins. # Reduced chi-squared = 1.237 for 57 degrees of freedom # Null hypothesis probability = 1.079093e-01 Photon flux (15-150 keV) in 1 sec: 1.69654 ( -0.16831 0.16837 ) ph/cm2/s Energy fluence (15-150 keV) : 1.25205e-07 ( -1.43947e-08 1.45573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.284 sec. to 6.284 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03517 ( -0.603622 0.760747 ) Epeak [keV] : 86.6672 ( -27.7498 -86.6672 ) Norm@50keV : 2.54848E-02 ( -0.0128781 0.037824 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.55 using 59 PHA bins. # Reduced chi-squared = 1.224 for 56 degrees of freedom # Null hypothesis probability = 1.211014e-01 Photon flux (15-150 keV) in 1 sec: 1.66700 ( -0.17261 0.17235 ) ph/cm2/s Energy fluence (15-150 keV) : 1.20232e-07 ( -1.56878e-08 1.57997e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 33.744 sec. Hardness ratio (energy fluence ratio) = 1.11959252324
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.497692e-07 S(50-150 keV) = 7.150377e-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 = 2.191560528444370E-02, IMY = 2.953610303037070E-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: -239.744000 -6.368000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 208.4600 17.4787 2.3 48.3 42.0 4.1965 5.0 ------ UNKNOWN 206.0342 26.8234 2.7 41.2 32.8 1.4929 4.3 ------ UNKNOWN 183.2217 34.1541 1.9 20.4 37.3 1.2196 6.1 ------ UNKNOWN 115.7447 -1.5618 3.6 56.8 173.8 3.6842 3.2 ------ UNKNOWN 138.1560 82.8952 3.4 43.8 -64.1 3.2172 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.368000 10.756600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 123.9939 -4.8232 2.0 54.7 163.4 1.3869 5.7 ------ UNKNOWN 178.3657 49.0999 2.1 16.9 -11.0 0.2590 5.6 ------ UNKNOWN 146.6990 54.0166 0.3 16.5 -85.8 1.7032 33.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 49.756600 962.332900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 168.0384 17.0530 3.8 40.5 102.4 6.6734 3.1 ------ UNKNOWN 225.3536 39.6817 4.4 52.7 26.2 5.8479 2.6 ------ UNKNOWN 200.7615 41.7564 4.3 37.2 41.2 2.3459 2.7 ------ UNKNOWN 121.6900 18.1752 3.5 40.7 172.8 2.6838 3.3 ------ UNKNOWN