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: Thu Mar 17 18:54:03 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger671447
======================================================================
Trigger: 00671447 Segment: 000
BAT Trigger Time: 475232315.904 [s; MET]
Trigger Stop: 475232316.928 [s; MET]
UTC: 2016-01-23T08:58:20.166340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.286562972773 Dec: -33.7790721449038 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.65
Image Trigger?: NO
Rate S/N Ratio: 16.9115345252878 [ if not an image trigger ]
Image S/N Ratio: 8.65
Analysis Position: [ source = BAT ]
RA: 150.286562972773 Dec: -33.7790721449038 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 150.276634862504 Dec: -33.7897251236089 [deg; J2000]
{ 10h 01m 06.4s , -33d 47' 23.0" }
+/- 1.57196349720789 [arcmin] (estimated 90% radius based on SNR)
+/- 0.608294588531128 [arcmin] (formal 1-sigma fit error)
SNR: 15.9399259143936
Angular difference between the analysis and refined position is 0.808499 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 3.95199990272522 +/- 0.623246350817473
Measured from: -1.27599996328354
to: 2.67599993944168 [s; relative to TRIGTIME]
T50: 2.1159999370575 +/- 0.459077335217155
Measured from: -0.547999978065491
to: 1.567999958992 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.00800001621246338
to: 1.00800001621246 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.04799997806549
to: 3 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.141867 0.259866 0.143502 0.041699
0.018826 0.019827 0.016844 0.013425 [error]
Peak 0.045329 0.071220 0.042797 0.016521
0.008666 0.009241 0.007887 0.006160 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.048 -2.048 3.000
T90 3.952 -1.276 2.676
T50 2.116 -0.548 1.568
Peak 1.000 0.008 1.008
====== 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 -1.509 -0.162 0.161 - - - 7.34e-03 -7.50e-04 7.46e-04 47.720 57
CPL -0.566 -0.732 0.915 69.615 -16.049 80.821 2.39e-02 -1.42e-02 5.15e-02 42.640 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 -1.547 -0.264 0.258 - - - 1.04e-02 -1.75e-03 1.73e-03 57.050 57
CPL -0.531 -1.102 1.502 66.898 -19.073 -66.898 3.67e-02 -3.67e-02 1.98e-01 54.710 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 4.77e-08 8.72e-08 1.23e-07 3.61e-07 3.51e-07 6.19e-07 erg/cm2
90%_error_low -7.39e-09 -8.84e-09 -1.60e-08 -8.88e-08 -3.90e-08 -1.04e-07 erg/cm2
90%_error_hi 7.63e-09 8.81e-09 1.60e-08 1.06e-07 3.94e-08 1.18e-07 erg/cm2
Peak flux PL 4.47e-01 4.38e-01 3.00e-01 3.22e-01 1.31e+00 1.51e+00 ph/cm2/s
90%_error_low -1.09e-01 -7.20e-02 -6.28e-02 -1.16e-01 -2.10e-01 -2.44e-01 ph/cm2/s
90%_error_hi 1.15e-01 7.15e-02 6.25e-02 1.49e-01 2.10e-01 2.47e-01 ph/cm2/s
Fluence CPL 4.28e-08 9.78e-08 1.25e-07 9.40e-08 3.22e-07 3.59e-07 erg/cm2
90%_error_low -8.45e-09 -1.21e-08 -1.91e-08 -5.88e-08 -4.47e-08 -7.31e-08 erg/cm2
90%_error_hi 8.57e-09 1.28e-08 1.84e-08 1.59e-07 4.56e-08 1.60e-07 erg/cm2
Peak flux CPL 3.91e-01 4.91e-01 3.15e-01 1.08e-01 1.27e+00 1.30e+00 ph/cm2/s
90%_error_low -1.27e-01 -9.37e-02 -7.40e-02 -1.08e-01 -2.15e-01 -2.34e-01 ph/cm2/s
90%_error_hi 1.31e-01 9.97e-02 7.33e-02 2.61e-01 2.15e-01 2.98e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 150.2766 -33.7897 0.0120 23.8425 -107.2257 0.5670870 15.940 TRIG_00671447 Foreground time interval of the image: -2.048 3.000 (delta_t = 5.048 [sec]) Background time interval of the image: -239.904 -2.048 (delta_t = 237.856 [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 -2.048 sec. to 3.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50898 ( -0.162291 0.161363 ) Norm@50keV : 7.34386E-03 ( -0.00075043 0.000746272 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.72 using 59 PHA bins. # Reduced chi-squared = 0.8371 for 57 degrees of freedom # Null hypothesis probability = 8.046777e-01 Photon flux (15-150 keV) in 5.048 sec: 0.919055 ( -0.091252 0.091325 ) ph/cm2/s Energy fluence (15-150 keV) : 3.5122e-07 ( -3.89868e-08 3.94042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.048 sec. to 3.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.565751 ( -0.731694 0.914924 ) Epeak [keV] : 69.6151 ( -16.0464 80.8233 ) Norm@50keV : 2.38976E-02 ( -0.0141581 0.0514935 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.64 using 59 PHA bins. # Reduced chi-squared = 0.7614 for 56 degrees of freedom # Null hypothesis probability = 9.057651e-01 Photon flux (15-150 keV) in 5.048 sec: 0.890187 ( -0.094382 0.094252 ) ph/cm2/s Energy fluence (15-150 keV) : 3.21514e-07 ( -4.47499e-08 4.56328e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.008 sec. to 1.008 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54662 ( -0.264181 0.25804 ) Norm@50keV : 1.03844E-02 ( -0.0017489 0.00172745 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.05 using 59 PHA bins. # Reduced chi-squared = 1.001 for 57 degrees of freedom # Null hypothesis probability = 4.733039e-01 Photon flux (15-150 keV) in 1 sec: 1.31337 ( -0.20993 0.21009 ) ph/cm2/s Energy fluence (15-150 keV) : 9.78205e-08 ( -1.76675e-08 1.79639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 1.008 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.530726 ( -1.10159 1.50206 ) Epeak [keV] : 66.8982 ( -19.0731 -66.8981 ) Norm@50keV : 3.67180E-02 ( -0.0367181 0.198496 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.71 using 59 PHA bins. # Reduced chi-squared = 0.9770 for 56 degrees of freedom # Null hypothesis probability = 5.236351e-01 Photon flux (15-150 keV) in 1 sec: 1.27434 ( -0.21528 0.21513 ) ph/cm2/s Energy fluence (15-150 keV) : 9.00596e-08 ( -1.89759e-08 1.99271e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.952 sec. Hardness ratio (energy fluence ratio) = 1.40549730607
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.349751e-07 S(50-150 keV) = 2.1624688e-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 = -1.308747690339830E-01, IMY = 4.221164039280391E-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: -239.904000 -2.048000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5351 -40.5329 1.7 24.3 -73.7 1.8387 6.7 1.3 Vela X-1 151.8719 25.1273 3.1 45.7 137.7 3.8587 3.7 ------ UNKNOWN 160.1718 25.3614 2.8 49.8 146.2 4.5450 4.1 ------ UNKNOWN 108.9571 -7.5885 2.5 24.3 40.9 1.1458 4.6 ------ UNKNOWN 155.9693 4.4414 2.8 31.4 163.0 1.2295 4.1 ------ UNKNOWN 114.2628 -53.3720 2.3 39.6 -50.8 2.2450 5.1 ------ UNKNOWN 170.8698 -43.6563 3.2 42.6 -109.5 3.7182 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.048000 3.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6419 -40.6142 47.4 24.4 -73.9 0.0089 0.2 6.3 Vela X-1 143.5082 11.7155 2.3 30.2 134.9 0.2043 4.9 ------ UNKNOWN 171.6769 -15.1069 2.2 38.0 -153.8 0.2042 5.2 ------ UNKNOWN 150.2766 -33.7897 0.7 23.8 -107.2 0.5671 15.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.396640 962.194500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5434 -40.5346 0.8 13.5 -6.0 9.8239 14.2 1.4 Vela X-1 170.3475 -60.6191 4.9 29.9 -81.5 -2.4597 -2.4 1.0 Cen X-3 186.7574 -62.7994 14.1 36.9 -88.6 1.7076 0.8 3.3 GX 301-2 169.9998 5.1835 2.3 43.2 147.7 9.7034 5.0 ------ UNKNOWN 196.1837 1.2092 4.8 55.5 178.9 8.2241 2.4 ------ UNKNOWN 69.7233 -67.0119 2.9 55.6 -33.9 17.7810 4.0 ------ UNKNOWN 86.7206 -75.1989 3.8 50.8 -44.5 13.2501 3.1 ------ UNKNOWN