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: Wed Jun 1 15:59:24 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger682339
======================================================================
Trigger: 00682339 Segment: 000
BAT Trigger Time: 482030948.032 [s; MET]
Trigger Stop: 482030948.544 [s; MET]
UTC: 2016-04-11T01:28:51.924060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 349.361911484438 Dec: -40.2708134633611 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 15.9059737205869 [ if not an image trigger ]
Image S/N Ratio: 7.44
Analysis Position: [ source = BAT ]
RA: 349.361911484438 Dec: -40.2708134633611 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 349.373060255973 Dec: -40.258861585134 [deg; J2000]
{ 23h 17m 29.5s , -40d 15' 31.9" }
+/- 2.39899764309769 [arcmin] (estimated 90% radius based on SNR)
+/- 0.986504018371565 [arcmin] (formal 1-sigma fit error)
SNR: 8.71402166353091
Angular difference between the analysis and refined position is 0.880224 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 0.355999946594238 +/- 0.0756042006334982
Measured from: 0.0879999995231628
to: 0.443999946117401 [s; relative to TRIGTIME]
T50: 0.195999979972839 +/- 0.0651152459160164
Measured from: 0.159999966621399
to: 0.355999946594238 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.241999983787537
to: 0.758000016212463 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0600000023841858
to: 0.452000021934509 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.016191 0.049774 0.050797 0.013886
0.008515 0.008968 0.009117 0.006765 [error]
Peak 0.031910 0.073084 0.051593 0.016754
0.012152 0.012939 0.012400 0.009344 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.392 0.060 0.452
T90 0.356 0.088 0.444
T50 0.196 0.160 0.356
Peak 1.000 -0.242 0.758
====== 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 -1.409 -0.305 0.298 - - - 2.07e-02 -4.57e-03 4.56e-03 65.940 57
CPL 1.402 -1.778 3.305 66.585 -13.124 25.758 4.12e-01 -4.12e-01 1.07e+01 56.770 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 -1.632 -0.353 0.334 - - - 1.15e-02 -2.72e-03 2.68e-03 64.990 57
CPL 1.240 -2.158 4.029 51.931 -10.259 26.237 3.81e-01 -3.81e-01 4.53e+01 59.070 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 9.52e-09 1.85e-08 2.78e-08 9.07e-08 7.82e-08 1.47e-07 erg/cm2
90%_error_low -3.12e-09 -4.38e-09 -7.01e-09 -3.78e-08 -1.80e-08 -4.56e-08 erg/cm2
90%_error_hi 3.42e-09 4.35e-09 6.95e-09 4.92e-08 1.81e-08 5.38e-08 erg/cm2
Peak flux PL 5.35e-01 4.98e-01 3.22e-01 3.20e-01 1.49e+00 1.68e+00 ph/cm2/s
90%_error_low -1.70e-01 -1.14e-01 -9.29e-02 -1.48e-01 -3.34e-01 -3.77e-01 ph/cm2/s
90%_error_hi 1.84e-01 1.13e-01 9.27e-02 2.01e-01 3.35e-01 3.79e-01 ph/cm2/s
Fluence CPL 5.13e-09 2.29e-08 3.67e-08 1.30e-08 7.55e-08 7.78e-08 erg/cm2
90%_error_low -3.42e-09 -5.89e-09 -1.05e-08 N/A -1.93e-08 -2.14e-08 erg/cm2
90%_error_hi 4.18e-09 5.99e-09 1.07e-08 N/A 1.95e-08 2.85e-08 erg/cm2
Peak flux CPL 3.45e-01 6.45e-01 3.51e-01 3.30e-02 1.37e+00 1.37e+00 ph/cm2/s
90%_error_low -2.10e-01 -1.60e-01 -1.39e-01 -3.30e-02 -3.51e-01 -3.53e-01 ph/cm2/s
90%_error_hi 2.31e-01 1.70e-01 1.29e-01 1.38e-01 3.51e-01 3.62e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 349.3731 -40.2589 0.0221 41.9472 -133.4827 0.1438468 8.714 TRIG_00682339 Foreground time interval of the image: 0.060 0.452 (delta_t = 0.392 [sec]) Background time interval of the image: -81.731 0.060 (delta_t = 81.791 [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 0.060 sec. to 0.452 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40944 ( -0.303467 0.299254 ) Norm@50keV : 2.06955E-02 ( -0.00456469 0.00456188 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.94 using 59 PHA bins. # Reduced chi-squared = 1.157 for 57 degrees of freedom # Null hypothesis probability = 1.952526e-01 Photon flux (15-150 keV) in 0.392 sec: 2.52626 ( -0.57323 0.5762 ) ph/cm2/s Energy fluence (15-150 keV) : 7.82322e-08 ( -1.80115e-08 1.80943e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 0.452 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.40225 ( -1.77778 3.30513 ) Epeak [keV] : 66.5851 ( -13.1238 25.7583 ) Norm@50keV : 0.412443 ( -0.412444 10.6718 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.77 using 59 PHA bins. # Reduced chi-squared = 1.014 for 56 degrees of freedom # Null hypothesis probability = 4.461073e-01 Photon flux (15-150 keV) in 0.392 sec: 2.39281 ( -0.58849 0.59049 ) ph/cm2/s Energy fluence (15-150 keV) : 7.55188e-08 ( -1.93395e-08 1.95386e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.242 sec. to 0.758 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63178 ( -0.353393 0.333691 ) Norm@50keV : 1.14598E-02 ( -0.00272308 0.00268404 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.99 using 59 PHA bins. # Reduced chi-squared = 1.140 for 57 degrees of freedom # Null hypothesis probability = 2.183141e-01 Photon flux (15-150 keV) in 1 sec: 1.48751 ( -0.33405 0.33466 ) ph/cm2/s Energy fluence (15-150 keV) : 1.0681e-07 ( -2.63556e-08 2.68896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.242 sec. to 0.758 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.24041 ( -2.1879 3.99891 ) Epeak [keV] : 51.9308 ( -10.1401 26.3567 ) Norm@50keV : 0.381442 ( -0.405766 45.3047 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.07 using 59 PHA bins. # Reduced chi-squared = 1.055 for 56 degrees of freedom # Null hypothesis probability = 3.639494e-01 Photon flux (15-150 keV) in 1 sec: 1.37142 ( -0.35057 0.35144 ) ph/cm2/s Energy fluence (15-150 keV) : 9.12914e-08 ( -2.48146e-08 2.88133e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.3559999 sec. Hardness ratio (energy fluence ratio) = 1.50494270829
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.8011986e-08 S(50-150 keV) = 5.022149e-08
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 = -6.184523809566941E-01, IMY = 6.521067639165855E-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: -81.731420 0.060000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 297.7962 -63.1040 3.6 41.2 168.2 0.5380 3.2 ------ UNKNOWN 301.0864 -54.8947 2.8 47.3 176.6 0.9221 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.060000 0.452000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 349.3730 -40.2589 1.3 41.9 -133.5 0.1439 8.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: