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 16:06:53 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger682059
======================================================================
Trigger: 00682059 Segment: 000
BAT Trigger Time: 481789559.872 [s; MET]
Trigger Stop: 481789560.256 [s; MET]
UTC: 2016-04-08T06:25:43.777280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 122.557289379001 Dec: 71.1402129989282 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.3
Image Trigger?: NO
Rate S/N Ratio: 38.9615194775563 [ if not an image trigger ]
Image S/N Ratio: 11.3
Analysis Position: [ source = BAT ]
RA: 122.557289379001 Dec: 71.1402129989282 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 122.562580624257 Dec: 71.1277445349553 [deg; J2000]
{ 08h 10m 15.0s , +71d 07' 39.9" }
+/- 1.82274777644503 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02525558331457 [arcmin] (formal 1-sigma fit error)
SNR: 12.9018456292583
Angular difference between the analysis and refined position is 0.755118 arcmin
Partial Coding Fraction: 0.3320312 [ including projection effects ]
Duration
T90: 0.319999933242798 +/- 0.0368781685195268
Measured from: 0.0360000133514404
to: 0.355999946594238 [s; relative to TRIGTIME]
T50: 0.179999947547913 +/- 0.0432666203311027
Measured from: 0.100000023841858
to: 0.279999971389771 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.303999960422516
to: 0.696000039577484 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0160000324249268
to: 0.37200003862381 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.025989 0.056460 0.089163 0.054177
0.007015 0.009561 0.010118 0.009378 [error]
Peak 0.026241 0.076582 0.121650 0.051133
0.011147 0.013469 0.013328 0.011762 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.356 0.016 0.372
T90 0.320 0.036 0.356
T50 0.180 0.100 0.280
Peak 1.000 -0.304 0.696
====== 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: 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 -0.868 -0.245 0.256 - - - 3.96e-02 -5.95e-03 5.87e-03 56.230 57
CPL -0.487 -0.501 1.280 246.351 -246.351 -246.351 5.70e-02 N/A N/A 55.840 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 -0.905 -0.244 0.258 - - - 1.84e-02 -2.97e-03 2.93e-03 53.870 57
CPL 0.550 -1.232 1.752 107.364 -27.916 221.663 7.32e-02 -7.32e-02 2.54e-01 49.640 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 1.00e-08 2.71e-08 5.95e-08 3.42e-07 1.60e-07 4.39e-07 erg/cm2
90%_error_low -2.90e-09 -5.08e-09 -9.14e-09 -1.06e-07 -2.45e-08 -1.12e-07 erg/cm2
90%_error_hi 3.22e-09 4.95e-09 9.02e-09 1.36e-07 2.46e-08 1.38e-07 erg/cm2
Peak flux PL 4.30e-01 6.18e-01 6.60e-01 1.31e+00 2.11e+00 3.02e+00 ph/cm2/s
90%_error_low -1.31e-01 -1.27e-01 -1.02e-01 -3.73e-01 -3.38e-01 -4.79e-01 ph/cm2/s
90%_error_hi 1.48e-01 1.26e-01 1.01e-01 4.58e-01 3.41e-01 4.94e-01 ph/cm2/s
Fluence CPL 8.95e-09 2.76e-08 6.25e-08 2.22e-07 1.59e-07 3.21e-07 erg/cm2
90%_error_low -3.88e-09 -5.36e-09 -1.14e-08 -1.43e-07 -2.51e-08 -1.43e-07 erg/cm2
90%_error_hi 4.00e-09 5.46e-09 1.26e-08 1.43e-07 2.49e-08 1.52e-07 erg/cm2
Peak flux CPL 2.73e-01 6.35e-01 7.83e-01 5.02e-01 2.01e+00 2.19e+00 ph/cm2/s
90%_error_low -1.51e-01 -1.53e-01 -1.44e-01 -2.61e-01 -3.49e-01 -4.52e-01 ph/cm2/s
90%_error_hi 1.87e-01 1.48e-01 1.49e-01 6.05e-01 3.53e-01 6.64e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 122.5626 71.1277 0.0149 45.8567 -25.3478 0.2427134 12.902 TRIG_00682059 Foreground time interval of the image: 0.016 0.372 (delta_t = 0.356 [sec]) Background time interval of the image: -40.571 0.016 (delta_t = 40.587 [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 0.016 sec. to 0.372 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.868494 ( -0.244942 0.25627 ) Norm@50keV : 3.96136E-02 ( -0.00594644 0.00587144 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.23 using 59 PHA bins. # Reduced chi-squared = 0.9865 for 57 degrees of freedom # Null hypothesis probability = 5.038664e-01 Photon flux (15-150 keV) in 0.356 sec: 0.171835 0.193786 0.191382 0.188935 0.186678 0.184342 0.114949 7.50212E-02 5.37835E-02 4.27296E-02 3.67811E-02 3.13924E-02 2.65794E-02 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.60258e-07 ( -2.45111e-08 2.45837e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 0.372 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.486533 ( -0.501304 1.28011 ) Epeak [keV] : 246.351 ( -246.321 -246.321 ) Norm@50keV : 5.70015E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.84 using 59 PHA bins. # Reduced chi-squared = 0.9971 for 56 degrees of freedom # Null hypothesis probability = 4.809578e-01 Photon flux (15-150 keV) in 0.356 sec: 4.49549 ( -0.67663 0.68994 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59269e-07 ( -2.51189e-08 2.49272e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.304 sec. to 0.696 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.904721 ( -0.243922 0.258378 ) Norm@50keV : 1.84231E-02 ( -0.00296828 0.00292739 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.87 using 59 PHA bins. # Reduced chi-squared = 0.9450 for 57 degrees of freedom # Null hypothesis probability = 5.934008e-01 Photon flux (15-150 keV) in 1 sec: 2.11464 ( -0.33841 0.34083 ) ph/cm2/s Energy fluence (15-150 keV) : 2.064e-07 ( -3.21632e-08 3.22437e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.304 sec. to 0.696 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.550265 ( -1.23199 1.75178 ) Epeak [keV] : 107.364 ( -27.9155 221.663 ) Norm@50keV : 7.31570E-02 ( -0.0731571 0.253614 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.64 using 59 PHA bins. # Reduced chi-squared = 0.8864 for 56 degrees of freedom # Null hypothesis probability = 7.128785e-01 Photon flux (15-150 keV) in 1 sec: 2.01297 ( -0.34915 0.35259 ) ph/cm2/s Energy fluence (15-150 keV) : 1.98793e-07 ( -3.43028e-08 3.39464e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 9.311642255971224E-01, IMY = 4.411101652933436E-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: -40.571410 0.016000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 131.1709 -26.7536 1.8 52.2 156.1 2.1750 6.4 ------ UNKNOWN 184.4816 51.2775 2.7 48.7 20.8 0.8202 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.016000 0.372000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 125.3071 -21.0625 2.6 46.7 163.4 0.0846 4.5 ------ UNKNOWN 99.1154 -23.9707 2.4 57.6 -168.8 0.1729 4.8 ------ UNKNOWN 184.8144 79.3265 2.5 58.8 -11.9 0.2611 4.5 ------ UNKNOWN 122.5626 71.1278 0.9 45.9 -25.3 0.2427 12.9 ------ UNKNOWN 95.3854 26.3688 2.2 30.7 -102.8 0.0723 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 78.828600 962.192200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6177 22.0179 0.8 54.0 -150.4 31.4507 13.9 0.9 Crab 170.0291 75.1479 4.3 13.9 35.3 1.3179 2.7 ------ UNKNOWN 321.6205 58.8672 4.0 49.3 -29.4 3.5871 2.9 ------ UNKNOWN