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 Jun 3 17:05:03 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/scripts
======================================================================
Trigger: 00682269 Segment: 000
BAT Trigger Time: 481957804.16 [s; MET]
Trigger Stop: 481957804.416 [s; MET]
UTC: 2016-04-10T05:09:48.056060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.68072928178 Dec: 3.44358286327285 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 55.0726792520575 [ if not an image trigger ]
Image S/N Ratio: 9.07
Analysis Position: [ source = BAT ]
RA: 150.68072928178 Dec: 3.44358286327285 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 150.709641740265 Dec: 3.44551357729276 [deg; J2000]
{ 10h 02m 50.3s , +03d 26' 43.8" }
+/- 2.1684313082 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10189740841201 [arcmin] (formal 1-sigma fit error)
SNR: 10.0672367343468
Angular difference between the analysis and refined position is 1.735484 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 96 +/- 50.5964425626941
Measured from: -15.160000026226
to: 80.839999973774 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -15.160000026226
to: 16.839999973774 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.33999997377396
to: 9.33999997377396 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.160000026226
to: 112.839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.349837 0.477759 0.587998 0.130462
0.077945 0.081874 0.073368 0.066829 [error]
Peak 0.009618 0.010493 0.017626 0.007900
0.009014 0.009686 0.008696 0.007686 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 128.000 -15.160 112.840
T90 96.000 -15.160 80.840
T50 32.000 -15.160 16.840
Peak 1.000 8.340 9.340
====== 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 -1.106 -0.278 0.288 - - - 8.62e-04 -1.29e-04 1.28e-04 64.890 57
CPL -1.106 -1.532 0.755 9999.360 N/A N/A 8.67e-04 N/A N/A 64.890 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 -1.062 -0.937 1.373 - - - 3.02e-03 -3.02e-03 1.83e-03 53.350 57
CPL -0.004 -7.589 0.004 108.227 -108.227 -108.227 9.09e-03 -9.09e-03 7.11e+02 53.140 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 9.76e-08 2.28e-07 4.24e-07 1.90e-06 1.15e-06 2.65e-06 erg/cm2
90%_error_low -2.95e-08 -4.32e-08 -7.17e-08 -6.60e-07 -1.83e-07 -7.03e-07 erg/cm2
90%_error_hi 3.31e-08 4.18e-08 7.01e-08 8.84e-07 1.84e-07 8.97e-07 erg/cm2
Peak flux PL 8.17e-02 1.07e-01 1.02e-01 1.74e-01 3.49e-01 4.65e-01 ph/cm2/s
90%_error_low -8.17e-02 -8.37e-02 -1.02e-01 -1.74e-01 -2.18e-01 -2.67e-01 ph/cm2/s
90%_error_hi 1.18e-01 8.28e-02 5.92e-02 3.31e-01 2.29e-01 5.17e-01 ph/cm2/s
Fluence CPL 9.75e-08 2.28e-07 4.20e-07 1.98e-06 1.15e-06 2.64e-06 erg/cm2
90%_error_low N/A N/A -7.23e-08 N/A -1.96e-07 -1.42e-06 erg/cm2
90%_error_hi N/A N/A 9.15e-08 N/A 1.91e-07 4.13e-07 erg/cm2
Peak flux CPL 6.32e-02 1.15e-01 1.18e-01 7.69e-02 3.43e-01 3.73e-01 ph/cm2/s
90%_error_low -6.32e-02 -9.57e-02 -1.18e-01 -7.69e-02 -2.09e-01 -2.38e-01 ph/cm2/s
90%_error_hi 1.25e-01 1.07e-01 8.93e-02 1.62e-01 2.29e-01 2.76e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 150.7096 3.4455 0.0191 36.7529 148.8867 1.0276269 10.067 TRIG_00682269 Foreground time interval of the image: -15.160 9.741 (delta_t = 24.901 [sec]) Background time interval of the image: -239.160 -15.160 (delta_t = 224.000 [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 -15.160 sec. to 112.840 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10617 ( -0.277808 0.287645 ) Norm@50keV : 8.62391E-04 ( -0.000129296 0.000128435 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.89 using 59 PHA bins. # Reduced chi-squared = 1.138 for 57 degrees of freedom # Null hypothesis probability = 2.209705e-01 Photon flux (15-150 keV) in 128 sec: 0.100092 ( -0.0156364 0.015735 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15197e-06 ( -1.82529e-07 1.83583e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.160 sec. to 112.840 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.09635 ( -0.541901 1.74566 ) Epeak [keV] : 34.7861 ( ) Norm@50keV : 1.89117E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.86 using 59 PHA bins. # Reduced chi-squared = 1.140 for 56 degrees of freedom # Null hypothesis probability = 2.198788e-01 Photon flux (15-150 keV) in 128 sec: 0.100609 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.15486e-06 ( -1.96146e-07 1.91277e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.340 sec. to 9.340 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06187 ( -0.936971 1.37306 ) Norm@50keV : 3.01668E-03 ( -0.00301679 0.00183132 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.35 using 59 PHA bins. # Reduced chi-squared = 0.9360 for 57 degrees of freedom # Null hypothesis probability = 6.126143e-01 Photon flux (15-150 keV) in 1 sec: 0.348753 ( -0.217917 0.228926 ) ph/cm2/s Energy fluence (15-150 keV) : 3.19374e-08 ( -1.84132e-08 1.84974e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.340 sec. to 9.340 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.00427357 ( -7.5886 0.00494824 ) Epeak [keV] : 108.227 ( -108.225 -108.225 ) Norm@50keV : 9.09143E-03 ( -0.00908978 711.039 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.14 using 59 PHA bins. # Reduced chi-squared = 0.9489 for 56 degrees of freedom # Null hypothesis probability = 5.839199e-01 Photon flux (15-150 keV) in 1 sec: 0.342949 ( -0.209239 0.229127 ) ph/cm2/s Energy fluence (15-150 keV) : 3.12795e-08 ( -2.05769e-08 1.81459e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 96.0 sec. Hardness ratio (energy fluence ratio) = 1.85810364194
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.26033e-07 S(50-150 keV) = 8.259401e-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 = -6.393836340852224E-01, IMY = -3.859028865711088E-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: -239.160000 -15.160000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 147.3434 -8.4946 2.6 49.0 151.4 3.2683 4.5 ------ UNKNOWN 222.0955 41.3170 2.6 49.0 25.8 2.6156 4.5 ------ UNKNOWN 165.9325 65.8878 2.6 26.6 -30.7 0.8565 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.160000 9.740600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 150.7096 3.4455 1.1 36.8 148.9 1.0275 10.1 ------ UNKNOWN 250.3594 70.1454 2.2 54.3 -15.2 0.8618 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.740600 483.120000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5390 -40.5682 1.2 46.2 -177.5 3.8382 9.5 0.9 Vela X-1 179.4635 26.3619 2.2 35.8 34.0 1.6089 5.2 ------ UNKNOWN 131.7887 -21.6108 2.8 31.2 -157.9 0.9995 4.1 ------ UNKNOWN 132.5817 28.4324 2.1 30.3 -46.2 1.4230 5.5 ------ UNKNOWN 109.0034 -40.2077 3.7 58.0 -156.7 4.1751 3.2 ------ UNKNOWN 116.9801 18.0305 3.4 36.1 -77.1 1.7662 3.4 ------ UNKNOWN