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: Mon Aug 22 15:47:10 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger706871
======================================================================
Trigger: 00706871 Segment: 000
BAT Trigger Time: 491736527.168 [s; MET]
Trigger Stop: 491736528.192 [s; MET]
UTC: 2016-08-01T09:28:30.522860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.762767149869 Dec: 13.4995972351227 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.93
Image Trigger?: NO
Rate S/N Ratio: 14.9666295470958 [ if not an image trigger ]
Image S/N Ratio: 9.93
Analysis Position: [ source = BAT ]
RA: 212.762767149869 Dec: 13.4995972351227 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 212.766318588363 Dec: 13.4827014060536 [deg; J2000]
{ 14h 11m 03.9s , +13d 28' 57.7" }
+/- 1.76389699310403 [arcmin] (estimated 90% radius based on SNR)
+/- 0.842572315625893 [arcmin] (formal 1-sigma fit error)
SNR: 13.521154650618
Angular difference between the analysis and refined position is 1.034709 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 2.85199993848801 +/- 0.415427463220295
Measured from: -1.16799998283386
to: 1.68399995565414 [s; relative to TRIGTIME]
T50: 1.31599998474121 +/- 0.404949358277075
Measured from: -0.379999995231628
to: 0.935999989509583 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0239999890327454
to: 0.976000010967255 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.34399998188019
to: 1.82800000905991 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105874 0.130221 0.072628 0.015817
0.012955 0.013797 0.011681 0.009278 [error]
Peak 0.046616 0.069362 0.022037 0.001191
0.007376 0.007980 0.006466 0.004885 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 3.172 -1.344 1.828
T90 2.852 -1.168 1.684
T50 1.316 -0.380 0.936
Peak 1.000 -0.024 0.976
====== 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 -1.848 -0.225 0.213 - - - 5.98e-03 -8.90e-04 8.69e-04 56.840 57
CPL -1.002 -0.912 1.136 51.310 -14.244 -51.310 1.79e-02 -1.79e-02 6.09e-02 54.390 56
=== 1-s peak 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 -1.975 -0.268 0.247 - - - 7.92e-03 -1.55e-03 1.52e-03 68.930 57
CPL 0.826 -1.581 2.341 39.614 -5.907 8.067 3.75e-01 -3.75e-01 1.02e+01 57.880 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 3.36e-08 5.00e-08 5.55e-08 1.16e-07 1.74e-07 2.56e-07 erg/cm2
90%_error_low -5.88e-09 -6.22e-09 -1.09e-08 -4.00e-08 -2.57e-08 -5.29e-08 erg/cm2
90%_error_hi 6.05e-09 6.22e-09 1.11e-08 5.13e-08 2.61e-08 6.18e-08 erg/cm2
Peak flux PL 5.16e-01 3.92e-01 1.99e-01 1.46e-01 1.17e+00 1.25e+00 ph/cm2/s
90%_error_low -1.05e-01 -6.23e-02 -4.86e-02 -5.66e-02 -1.86e-01 -2.01e-01 ph/cm2/s
90%_error_hi 1.09e-01 6.23e-02 4.97e-02 7.36e-02 1.86e-01 2.02e-01 ph/cm2/s
Fluence CPL 3.10e-08 5.56e-08 5.51e-08 3.32e-08 1.62e-07 1.75e-07 erg/cm2
90%_error_low -6.75e-09 -8.10e-09 -1.31e-08 -2.42e-08 -2.72e-08 -3.73e-08 erg/cm2
90%_error_hi 6.75e-09 8.99e-09 1.25e-08 9.61e-08 2.89e-08 9.87e-08 erg/cm2
Peak flux CPL 4.20e-01 5.35e-01 1.73e-01 8.11e-03 1.14e+00 1.14e+00 ph/cm2/s
90%_error_low -1.22e-01 -9.81e-02 -7.27e-02 -8.11e-03 -1.83e-01 -1.83e-01 ph/cm2/s
90%_error_hi 1.25e-01 1.02e-01 6.94e-02 3.17e-02 1.84e-01 1.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 212.7663 13.4827 0.0143 29.5146 20.4480 0.3242621 13.521 TRIG_00706871 Foreground time interval of the image: -1.344 1.828 (delta_t = 3.172 [sec]) Background time interval of the image: -239.168 -1.344 (delta_t = 237.824 [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 -1.344 sec. to 1.828 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84845 ( -0.225326 0.212989 ) Norm@50keV : 5.97874E-03 ( -0.000889968 0.000869387 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.84 using 59 PHA bins. # Reduced chi-squared = 0.9971 for 57 degrees of freedom # Null hypothesis probability = 4.812263e-01 Photon flux (15-150 keV) in 3.172 sec: 0.839892 ( -0.104718 0.104742 ) ph/cm2/s Energy fluence (15-150 keV) : 1.74407e-07 ( -2.56512e-08 2.61297e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.344 sec. to 1.828 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00238 ( -0.912072 1.13633 ) Epeak [keV] : 51.3105 ( -14.2445 -51.3105 ) Norm@50keV : 1.79401E-02 ( -0.0179401 0.0608771 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.39 using 59 PHA bins. # Reduced chi-squared = 0.9712 for 56 degrees of freedom # Null hypothesis probability = 5.361500e-01 Photon flux (15-150 keV) in 3.172 sec: 0.819013 ( -0.107099 0.107156 ) ph/cm2/s Energy fluence (15-150 keV) : 1.62485e-07 ( -2.72457e-08 2.8867e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.024 sec. to 0.976 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.97547 ( -0.267695 0.247858 ) Norm@50keV : 7.91713E-03 ( -0.00155086 0.00151982 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.93 using 59 PHA bins. # Reduced chi-squared = 1.209 for 57 degrees of freedom # Null hypothesis probability = 1.336120e-01 Photon flux (15-150 keV) in 1 sec: 1.17446 ( -0.185841 0.18585 ) ph/cm2/s Energy fluence (15-150 keV) : 7.2929e-08 ( -1.35094e-08 1.38391e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.976 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.826273 ( -1.59634 2.32607 ) Epeak [keV] : 39.6142 ( -5.87684 8.09673 ) Norm@50keV : 0.375409 ( -0.388101 10.1983 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.88 using 59 PHA bins. # Reduced chi-squared = 1.034 for 56 degrees of freedom # Null hypothesis probability = 4.057696e-01 Photon flux (15-150 keV) in 1 sec: 1.13600 ( -0.182935 0.18398 ) ph/cm2/s Energy fluence (15-150 keV) : 6.25331e-08 ( -1.16176e-08 1.29448e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 2.852 sec. Hardness ratio (energy fluence ratio) = 1.11083685644
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.360158e-08 S(50-150 keV) = 9.080783e-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 = 5.304375290009572E-01, IMY = -1.977738262508182E-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: -239.168000 -1.344000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 190.3568 51.3698 3.3 56.7 -29.4 4.3402 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.344000 1.828000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 200.5935 -52.3936 2.3 47.9 141.4 0.4645 5.0 ------ UNKNOWN 212.7663 13.4827 0.9 29.5 20.4 0.3242 13.5 ------ UNKNOWN 161.9596 28.2060 2.0 43.0 -67.0 0.4823 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 70.732600 962.965800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4988 35.4358 5.8 43.4 36.7 2.4963 2.0 6.0 Her X-1 239.9673 46.1150 2.8 39.8 14.2 3.2228 4.1 ------ UNKNOWN 212.0583 -25.6334 2.3 39.2 165.5 4.9441 5.0 ------ UNKNOWN 230.0749 43.5438 3.2 33.5 7.6 2.4277 3.7 ------ UNKNOWN 171.8633 12.9199 3.6 39.8 -101.4 7.5550 3.2 ------ UNKNOWN