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: Fri Jul 10 23:58:17 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger643833
======================================================================
Trigger: 00643833 Segment: 000
BAT Trigger Time: 456036160.768 [s; MET]
Trigger Stop: 456036168.96 [s; MET]
UTC: 2015-06-15T04:42:27.048040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 107.570242386832 Dec: -22.471915183491 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.52
Image Trigger?: NO
Rate S/N Ratio: 14.142135623731 [ if not an image trigger ]
Image S/N Ratio: 10.52
Analysis Position: [ source = BAT ]
RA: 107.570242386832 Dec: -22.471915183491 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 107.544771652447 Dec: -22.4681600613637 [deg; J2000]
{ 07h 10m 10.7s , -22d 28' 05.4" }
+/- 1.83988874689869 [arcmin] (estimated 90% radius based on SNR)
+/- 0.934000086233514 [arcmin] (formal 1-sigma fit error)
SNR: 12.7304782220261
Angular difference between the analysis and refined position is 1.430079 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 32.6839999556541 +/- 7.48940716116703
Measured from: -1.95600003004074
to: 30.7279999256134 [s; relative to TRIGTIME]
T50: 13.8359999060631 +/- 5.33741215626278
Measured from: 3.06800001859665
to: 16.9039999246597 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.80000001192093
to: 6.80000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.86000001430511
to: 36.4800000190735 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.374145 0.391850 0.247264 0.028964
0.039414 0.040938 0.035736 0.031677 [error]
Peak 0.026813 0.023162 0.014257 0.007697
0.006540 0.006725 0.005902 0.004840 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 39.340 -2.860 36.480
T90 32.684 -1.956 30.728
T50 13.836 3.068 16.904
Peak 1.000 5.800 6.800
====== 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 -1.798 -0.214 0.205 - - - 1.67e-03 -2.20e-04 2.15e-04 41.740 57
CPL -1.805 -0.208 0.730 9999.360 -9999.350 -9999.360 1.67e-03 -7.57e-04 2.49e-03 41.740 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 -1.924 -0.642 0.536 - - - 4.09e-03 -1.55e-03 1.38e-03 59.360 57
CPL -1.915 -1.964 0.476 9999.270 N/A N/A 4.11e-03 N/A N/A 59.360 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 1.11e-07 1.71e-07 1.96e-07 4.32e-07 6.06e-07 9.10e-07 erg/cm2
90%_error_low -1.86e-08 -1.89e-08 -3.51e-08 -1.40e-07 -8.03e-08 -1.77e-07 erg/cm2
90%_error_hi 1.91e-08 1.88e-08 3.53e-08 1.78e-07 8.18e-08 2.08e-07 erg/cm2
Peak flux PL 2.54e-01 1.99e-01 1.05e-01 8.01e-02 5.94e-01 6.37e-01 ph/cm2/s
90%_error_low -1.00e-01 -5.37e-02 -5.00e-02 -5.55e-02 -1.60e-01 -1.75e-01 ph/cm2/s
90%_error_hi 1.07e-01 5.36e-02 5.00e-02 9.91e-02 1.60e-01 1.77e-01 ph/cm2/s
Fluence CPL 1.12e-07 1.69e-07 1.96e-07 4.42e-07 6.10e-07 8.95e-07 erg/cm2
90%_error_low -2.14e-08 -1.79e-08 -4.10e-08 -2.28e-07 -1.03e-07 -3.09e-07 erg/cm2
90%_error_hi 2.00e-08 2.60e-08 4.16e-08 8.92e-08 6.32e-08 1.88e-07 erg/cm2
Peak flux CPL 2.28e-01 1.62e-01 7.99e-02 6.56e-02 4.99e-01 5.37e-01 ph/cm2/s
90%_error_low N/A -1.62e-01 -7.99e-02 -3.53e-02 -2.58e-01 -2.77e-01 ph/cm2/s
90%_error_hi N/A 6.56e-02 4.48e-02 3.72e-02 2.38e-01 2.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 107.5448 -22.4682 0.0152 28.1396 -176.2403 1.0160731 12.730 TRIG_00643833 Foreground time interval of the image: -2.860 36.480 (delta_t = 39.340 [sec]) Background time interval of the image: -525.667 -509.378 (delta_t = 16.289 [sec]) -239.768 -2.860 (delta_t = 236.908 [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 -2.860 sec. to 36.480 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79834 ( -0.213872 0.205208 ) Norm@50keV : 1.67305E-03 ( -0.000220207 0.000214682 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.74 using 59 PHA bins. # Reduced chi-squared = 0.7323 for 57 degrees of freedom # Null hypothesis probability = 9.354084e-01 Photon flux (15-150 keV) in 39.34 sec: 0.230407 ( -0.025627 0.025641 ) ph/cm2/s Energy fluence (15-150 keV) : 6.06056e-07 ( -8.03366e-08 8.17945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.860 sec. to 36.480 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.80469 ( -0.210769 0.727598 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 1.66811E-03 ( -0.000761685 0.00248608 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.74 using 59 PHA bins. # Reduced chi-squared = 0.7454 for 56 degrees of freedom # Null hypothesis probability = 9.218283e-01 Photon flux (15-150 keV) in 39.34 sec: 0.231003 ( -0.027922 0.026414 ) ph/cm2/s Energy fluence (15-150 keV) : 6.10344e-07 ( -1.03057e-07 6.31816e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.800 sec. to 6.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.92374 ( -0.642354 0.53639 ) Norm@50keV : 4.09380E-03 ( -0.00155178 0.00138386 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.36 using 59 PHA bins. # Reduced chi-squared = 1.041 for 57 degrees of freedom # Null hypothesis probability = 3.897269e-01 Photon flux (15-150 keV) in 1 sec: 0.593554 ( -0.159885 0.159891 ) ph/cm2/s Energy fluence (15-150 keV) : 3.76556e-08 ( -1.27217e-08 1.32658e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.800 sec. to 6.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.41212 ( -0.46828 1.97106 ) Epeak [keV] : 380.842 ( ) Norm@50keV : 7.98873E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.52 using 59 PHA bins. # Reduced chi-squared = 1.027 for 56 degrees of freedom # Null hypothesis probability = 4.186935e-01 Photon flux (15-150 keV) in 1 sec: 0.499182 ( -0.257657 0.237849 ) ph/cm2/s Energy fluence (15-150 keV) : 3.3655e-08 ( -1.72744e-08 1.31821e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 32.684 sec. Hardness ratio (energy fluence ratio) = 1.15003236717
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.81825e-07 S(50-150 keV) = 3.242258e-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 = -5.336869788725411E-01, IMY = 3.507030346768814E-02
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: -525.667390 -509.378000 -239.768000 -2.860000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7477 -40.5403 5.2 36.3 127.9 -1.2975 -2.2 10.0 Vela X-1 116.6947 -16.2374 2.5 17.5 -177.4 0.8873 4.7 ------ UNKNOWN 155.8634 39.8514 2.3 50.4 -19.0 2.4790 5.0 ------ UNKNOWN 71.6646 -25.4295 5.1 59.6 -161.6 4.1579 2.3 ------ UNKNOWN 138.3436 41.3486 3.2 46.6 -36.1 1.5611 3.6 ------ UNKNOWN 85.9397 6.2256 2.3 45.3 -121.3 4.5613 5.2 ------ UNKNOWN 85.6492 6.0650 2.5 45.6 -121.6 4.4702 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.860000 36.480000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3840 -40.5932 5.7 36.3 128.4 0.3541 2.0 7.0 Vela X-1 107.5448 -22.4681 0.9 28.1 -176.2 1.0159 12.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.732590 962.364100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5861 -40.7238 4.2 29.8 73.4 -2.9771 -2.7 10.5 Vela X-1 46.4020 -38.3878 3.5 54.1 177.1 7.3952 3.3 ------ UNKNOWN 137.9974 20.0759 3.2 51.9 -23.7 5.1722 3.6 ------ UNKNOWN 136.8881 26.7800 3.4 56.8 -29.4 12.7934 3.4 ------ UNKNOWN 69.0304 3.2291 3.0 45.6 -121.5 9.6825 3.8 ------ UNKNOWN