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 Dec 13 15:47:51 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger665268
======================================================================
Trigger: 00665268 Segment: 000
BAT Trigger Time: 470308145.28 [s; MET]
Trigger Stop: 470308145.536 [s; MET]
UTC: 2015-11-27T09:08:49.807240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.7778363516866 Dec: -82.773849221241 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.86
Image Trigger?: NO
Rate S/N Ratio: 12.5299640861417 [ if not an image trigger ]
Image S/N Ratio: 6.86
Analysis Position: [ source = BAT ]
RA: 19.7778363516866 Dec: -82.773849221241 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 19.6606456422828 Dec: -82.7616121566521 [deg; J2000]
{ 01h 18m 38.6s , -82d 45' 41.8" }
+/- 2.79318077851476 [arcmin] (estimated 90% radius based on SNR)
+/- 1.34551489332188 [arcmin] (formal 1-sigma fit error)
SNR: 7.01187282003185
Angular difference between the analysis and refined position is 1.150073 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 0.187999904155731 +/- 0.042520585314364
Measured from: 0.0240000486373901
to: 0.211999952793121 [s; relative to TRIGTIME]
T50: 0.0959999561309814 +/- 0.042520585314364
Measured from: 0.0760000348091125
to: 0.171999990940094 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.379999995231628
to: 0.620000004768372 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0160000324249268
to: 0.220000028610229 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006509 0.014960 0.016288 0.002608
0.002752 0.003119 0.003042 0.002395 [error]
Peak 0.007012 0.025647 0.015450 0.001306
0.005877 0.006077 0.005501 0.004809 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.204 0.016 0.220
T90 0.188 0.024 0.212
T50 0.096 0.076 0.172
Peak 1.000 -0.380 0.620
====== 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 -1.257 -0.328 0.339 - - - 1.14e-02 -2.66e-03 2.66e-03 47.170 57
CPL 0.184 -1.360 1.889 84.410 -23.636 303.934 5.45e-02 -5.45e-02 2.71e-01 43.860 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 -1.018 -0.577 0.694 - - - 3.38e-03 -1.18e-03 1.16e-03 54.190 57
CPL -0.691 0.691 6.491 189.443 -189.443 -189.443 5.09e-03 -2.84e-03 3.35e+01 54.240 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 2.37e-09 5.05e-09 8.45e-09 3.23e-08 2.33e-08 4.81e-08 erg/cm2
90%_error_low -8.83e-10 -1.33e-09 -2.18e-09 -1.39e-08 -5.63e-09 -1.62e-08 erg/cm2
90%_error_hi 9.72e-10 1.31e-09 2.15e-09 1.88e-08 5.65e-09 1.99e-08 erg/cm2
Peak flux PL 8.79e-02 1.18e-01 1.16e-01 2.07e-01 3.90e-01 5.29e-01 ph/cm2/s
90%_error_low -5.48e-02 -5.29e-02 -4.31e-02 -1.24e-01 -1.36e-01 -1.86e-01 ph/cm2/s
90%_error_hi 6.78e-02 4.98e-02 4.23e-02 2.31e-01 1.38e-01 2.10e-01 ph/cm2/s
Fluence CPL 1.78e-09 5.87e-09 1.02e-08 8.68e-09 2.31e-08 2.65e-08 erg/cm2
90%_error_low -1.01e-09 -1.65e-09 -2.84e-09 -6.02e-09 -5.73e-09 -8.23e-09 erg/cm2
90%_error_hi 1.12e-09 1.71e-09 3.02e-09 2.10e-08 5.75e-09 2.01e-08 erg/cm2
Peak flux CPL 8.70e-02 1.19e-01 1.17e-01 2.05e-01 3.89e-01 5.14e-01 ph/cm2/s
90%_error_low -5.75e-02 -5.05e-02 -4.37e-02 -2.05e-01 -1.38e-01 -2.55e-01 ph/cm2/s
90%_error_hi 6.59e-02 8.57e-02 4.93e-02 1.06e-01 1.38e-01 2.03e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 19.6606 -82.7616 0.0274 20.0095 -2.2689 0.0405565 7.012 TRIG_00665268 Foreground time interval of the image: 0.016 0.220 (delta_t = 0.204 [sec]) Background time interval of the image: -203.579 0.016 (delta_t = 203.595 [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 0.220 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25691 ( -0.327775 0.339758 ) Norm@50keV : 1.14104E-02 ( -0.00266162 0.00265882 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.17 using 59 PHA bins. # Reduced chi-squared = 0.8276 for 57 degrees of freedom # Null hypothesis probability = 8.202085e-01 Photon flux (15-150 keV) in 0.204 sec: 1.35117 ( -0.32696 0.32837 ) ph/cm2/s Energy fluence (15-150 keV) : 2.32546e-08 ( -5.63317e-09 5.6469e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 0.220 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.184442 ( -1.36026 1.88889 ) Epeak [keV] : 84.4096 ( -23.6382 303.932 ) Norm@50keV : 5.44938E-02 ( -0.0544866 0.27109 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.86 using 59 PHA bins. # Reduced chi-squared = 0.7832 for 56 degrees of freedom # Null hypothesis probability = 8.806826e-01 Photon flux (15-150 keV) in 0.204 sec: 1.34644 ( -0.32768 0.32937 ) ph/cm2/s Energy fluence (15-150 keV) : 2.3143e-08 ( -5.73132e-09 5.74852e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.380 sec. to 0.620 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0181 ( -0.57732 0.694368 ) Norm@50keV : 3.38101E-03 ( -0.00118241 0.00115818 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.19 using 59 PHA bins. # Reduced chi-squared = 0.9507 for 57 degrees of freedom # Null hypothesis probability = 5.812403e-01 Photon flux (15-150 keV) in 1 sec: 0.389650 ( -0.136437 0.137794 ) ph/cm2/s Energy fluence (15-150 keV) : 3.63329e-08 ( -1.31248e-08 1.34626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.380 sec. to 0.620 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.964329 ( 0.712281 6.51227 ) Epeak [keV] : 953.736 ( -968.882 -968.882 ) Norm@50keV : 3.60803E-03 ( -0.00135698 33.5202 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.19 using 59 PHA bins. # Reduced chi-squared = 0.9676 for 56 degrees of freedom # Null hypothesis probability = 5.437866e-01 Photon flux (15-150 keV) in 1 sec: 0.389122 ( -0.137702 0.137945 ) ph/cm2/s Energy fluence (15-150 keV) : 3.61393e-08 ( -1.96254e-08 1.35485e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.1879999 sec. Hardness ratio (energy fluence ratio) = 1.67347838551
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.419739e-09 S(50-150 keV) = 1.583509e-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 = 3.638718056106555E-01, IMY = 1.441658461201686E-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: -203.579410 0.016000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5551 -40.6059 3.2 33.6 158.1 1.1350 3.6 3.3 Vela X-1 170.2996 -60.6235 1.6 18.5 -140.3 1.3286 7.0 0.5 Cen X-3 186.8384 -62.8406 4.1 20.9 -117.1 0.6206 2.8 6.5 GX 301-2 178.4973 -62.5154 2.8 18.9 -126.8 0.8535 4.1 ------ UNKNOWN 207.6417 -77.0289 3.2 16.9 -68.8 0.7556 3.7 ------ UNKNOWN 201.2977 -60.9540 2.5 26.4 -105.9 1.2090 4.6 ------ UNKNOWN 181.9710 -23.7274 3.2 56.0 -148.7 4.4104 3.7 ------ UNKNOWN 186.1118 -26.8173 2.9 53.9 -143.4 5.0088 4.0 ------ UNKNOWN 210.8132 -45.6014 2.8 42.5 -109.9 3.5411 4.1 ------ UNKNOWN 196.4193 -35.6798 2.7 48.0 -129.2 4.5444 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.016000 0.220000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4424 -40.3948 4.4 33.8 157.9 0.0218 2.6 10.4 Vela X-1 170.6735 -60.7430 0.0 18.5 -139.6 -0.0063 -1.1 12.7 Cen X-3 186.3680 -62.8374 7.8 20.8 -117.6 0.0091 1.5 8.9 GX 301-2 25.6561 -46.5731 2.5 50.6 35.1 0.1261 4.6 ------ UNKNOWN 19.6603 -82.7615 1.6 20.0 -2.3 0.0405 7.0 ------ UNKNOWN 170.5801 -20.1961 2.3 57.2 -162.0 0.1309 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 57.820600 962.760000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6446 -40.5690 3.7 52.9 169.7 7.2748 3.1 5.4 Vela X-1 170.3144 -60.5774 1.7 35.9 -155.6 5.8880 7.0 2.7 Cen X-3 186.3721 -62.8242 3.7 34.2 -142.1 2.4688 3.1 8.4 GX 301-2 24.1365 -72.6115 2.6 10.2 56.1 2.5154 4.5 ------ UNKNOWN 78.6394 -85.1540 2.9 6.3 -172.8 2.2179 4.0 ------ UNKNOWN 344.1703 -71.4784 2.9 13.3 -4.7 2.1454 4.0 ------ UNKNOWN 327.2915 -30.6638 2.9 55.1 -7.5 7.0212 3.9 ------ UNKNOWN 180.7007 -70.0255 2.6 26.9 -145.6 2.9512 4.4 ------ UNKNOWN 318.6399 -28.7925 3.5 57.9 -16.2 9.8095 3.3 ------ UNKNOWN 292.6058 -39.2397 3.9 50.8 -44.4 10.7020 3.0 ------ UNKNOWN 202.2818 -49.2261 3.0 48.0 -129.1 12.5855 3.8 ------ UNKNOWN