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: Sun Mar 13 22:13:53 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger666352
======================================================================
Trigger: 00666352 Segment: 000
BAT Trigger Time: 471023176.448 [s; MET]
Trigger Stop: 471023179.52 [s; MET]
UTC: 2015-12-05T15:46:00.936900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 229.282355559918 Dec: 35.7691507793621 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.07
Image Trigger?: NO
Rate S/N Ratio: 16.431676725155 [ if not an image trigger ]
Image S/N Ratio: 7.07
Analysis Position: [ source = BAT ]
RA: 229.282355559918 Dec: 35.7691507793621 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 229.288120119494 Dec: 35.7679078665579 [deg; J2000]
{ 15h 17m 09.1s , +35d 46' 04.5" }
+/- 1.36549240860416 [arcmin] (estimated 90% radius based on SNR)
+/- 0.434747976743145 [arcmin] (formal 1-sigma fit error)
SNR: 19.4916213313303
Angular difference between the analysis and refined position is 0.290376 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 64 +/- 35.7770876399966
Measured from: -11.4480000138283
to: 52.5519999861717 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 4.55199998617172
to: 20.5519999861717 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 12.0519999861717
to: 13.0519999861717 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.4480000138283
to: 68.5519999861717 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.426066 0.680239 0.781129 0.135129
0.052425 0.055016 0.048979 0.042673 [error]
Peak 0.006966 0.013258 0.020134 0.007353
0.006080 0.006248 0.005697 0.004937 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.000 -11.448 68.552
T90 64.000 -11.448 52.552
T50 16.000 4.552 20.552
Peak 1.000 12.052 13.052
====== 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 -1.095 -0.132 0.134 - - - 1.72e-03 -1.30e-04 1.30e-04 52.780 57
CPL -0.468 -0.545 0.633 139.902 -42.816 436.082 3.26e-03 -1.36e-03 2.72e-03 48.850 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 -0.715 -0.611 0.744 - - - 3.35e-03 -1.32e-03 1.21e-03 39.170 57
CPL -0.664 0.664 3.617 9926.750 N/A N/A 3.33e-03 N/A N/A 39.180 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 1.21e-07 2.84e-07 5.32e-07 2.40e-06 1.44e-06 3.34e-06 erg/cm2
90%_error_low -1.77e-08 -2.56e-08 -4.62e-08 -4.44e-07 -1.19e-07 -4.74e-07 erg/cm2
90%_error_hi 1.86e-08 2.53e-08 4.60e-08 5.13e-07 1.20e-07 5.33e-07 erg/cm2
Peak flux PL 6.53e-02 1.05e-01 1.28e-01 3.07e-01 3.87e-01 6.06e-01 ph/cm2/s
90%_error_low -4.43e-02 -5.34e-02 -4.24e-02 -1.79e-01 -1.34e-01 -2.15e-01 ph/cm2/s
90%_error_hi 6.33e-02 5.23e-02 4.20e-02 3.23e-01 1.36e-01 2.74e-01 ph/cm2/s
Fluence CPL 1.03e-07 2.94e-07 5.65e-07 1.14e-06 1.40e-06 2.11e-06 erg/cm2
90%_error_low -2.31e-08 -2.83e-08 -5.50e-08 -4.93e-07 -1.27e-07 -5.02e-07 erg/cm2
90%_error_hi 2.38e-08 2.87e-08 5.64e-08 1.02e-06 1.28e-07 1.01e-06 erg/cm2
Peak flux CPL 6.38e-02 1.05e-01 1.29e-01 2.94e-01 3.86e-01 5.98e-01 ph/cm2/s
90%_error_low -6.38e-02 -1.05e-01 -4.35e-02 -2.94e-01 -1.41e-01 -3.31e-01 ph/cm2/s
90%_error_hi 6.38e-02 5.46e-02 6.05e-02 2.36e-01 1.37e-01 2.51e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 229.2881 35.7679 0.0098 14.6841 143.3463 1.7741094 19.492 TRIG_00666352 Foreground time interval of the image: -11.448 40.453 (delta_t = 51.901 [sec]) Background time interval of the image: -255.747 -11.448 (delta_t = 244.299 [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 -11.448 sec. to 68.552 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.09545 ( -0.132462 0.134444 ) Norm@50keV : 1.72212E-03 ( -0.000130023 0.000129849 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.78 using 59 PHA bins. # Reduced chi-squared = 0.9260 for 57 degrees of freedom # Null hypothesis probability = 6.338931e-01 Photon flux (15-150 keV) in 80 sec: 0.199667 ( -0.015495 0.015526 ) ph/cm2/s Energy fluence (15-150 keV) : 1.44268e-06 ( -1.19162e-07 1.19928e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.448 sec. to 68.552 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.468097 ( -0.544967 0.63255 ) Epeak [keV] : 139.902 ( -42.8143 436.083 ) Norm@50keV : 3.26087E-03 ( -0.0013611 0.00272283 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.85 using 59 PHA bins. # Reduced chi-squared = 0.8723 for 56 degrees of freedom # Null hypothesis probability = 7.399854e-01 Photon flux (15-150 keV) in 80 sec: 0.193450 ( -0.016514 0.016428 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39557e-06 ( -1.2739e-07 1.27538e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 12.052 sec. to 13.052 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.71465 ( -0.610903 0.744333 ) Norm@50keV : 3.34992E-03 ( -0.00132311 0.0012088 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.17 using 59 PHA bins. # Reduced chi-squared = 0.6873 for 57 degrees of freedom # Null hypothesis probability = 9.656332e-01 Photon flux (15-150 keV) in 1 sec: 0.386786 ( -0.134003 0.136474 ) ph/cm2/s Energy fluence (15-150 keV) : 4.06266e-08 ( -1.37917e-08 1.39015e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.052 sec. to 13.052 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.0956 ( 3.09696 6.0502 ) Epeak [keV] : 282.035 ( ) Norm@50keV : 7.80942E-05 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.75 using 59 PHA bins. # Reduced chi-squared = 0.6919 for 56 degrees of freedom # Null hypothesis probability = 9.617695e-01 Photon flux (15-150 keV) in 1 sec: 0.385887 ( -0.141064 0.137277 ) ph/cm2/s Energy fluence (15-150 keV) : 4.06415e-08 ( -1.45331e-08 1.38276e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 64.0 sec. Hardness ratio (energy fluence ratio) = 1.87197490469
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.04757e-07 S(50-150 keV) = 1.0379134e-06
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 = -2.102307519081593E-01, IMY = -1.564370588792474E-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: -255.747400 -11.448000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6883 35.2843 0.0 29.5 -175.7 0.2593 1.0 11.8 Her X-1 204.9932 60.1907 3.0 41.0 113.6 3.8651 3.8 ------ UNKNOWN 289.3265 25.6157 5.1 58.8 -159.2 3.7848 2.3 ------ UNKNOWN 286.8535 19.9517 3.4 57.8 -152.2 5.0491 3.4 ------ UNKNOWN 277.8497 11.6888 2.9 51.7 -139.5 4.8757 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -11.448000 40.452600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5535 35.2394 8.4 29.4 -175.6 -0.1490 -1.4 7.8 Her X-1 229.2881 35.7679 0.6 14.7 143.3 1.7741 19.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 80.052600 962.601300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3011 35.3060 9.3 20.3 -162.2 2.4224 1.2 8.0 Her X-1 299.5613 35.1528 2.2 55.9 -177.8 43.1709 5.3 3.3 Cyg X-1 181.5847 43.1739 3.9 37.0 50.3 9.0674 2.9 ------ UNKNOWN 203.5413 57.5365 2.2 27.7 83.7 12.8843 5.2 ------ UNKNOWN 251.4706 39.8924 3.1 18.0 -176.1 6.3262 3.8 ------ UNKNOWN