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 Feb 10 13:26:44 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger735331
======================================================================
Trigger: 00735331 Segment: 000
BAT Trigger Time: 507222827.2 [s; MET]
Trigger Stop: 507222827.328 [s; MET]
UTC: 2017-01-27T15:13:28.675820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.9443848948679 Dec: -30.3376379347453 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.99
Image Trigger?: NO
Rate S/N Ratio: 26.5141471671257 [ if not an image trigger ]
Image S/N Ratio: 8.99
Analysis Position: [ source = BAT ]
RA: 19.9443848948679 Dec: -30.3376379347453 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 19.9967774194699 Dec: -30.3404327702013 [deg; J2000]
{ 01h 19m 59.2s , -30d 20' 25.6" }
+/- 1.93234130484958 [arcmin] (estimated 90% radius based on SNR)
+/- 0.864980295765155 [arcmin] (formal 1-sigma fit error)
SNR: 11.8693567649006
Angular difference between the analysis and refined position is 2.718225 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.512000024318695 +/- 0.144886159629968
Measured from: 0.0480000376701355
to: 0.560000061988831 [s; relative to TRIGTIME]
T50: 0.25600004196167 +/- 0.0815843606584965
Measured from: 0.0799999833106995
to: 0.336000025272369 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.155999958515167
to: 0.844000041484833 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0480000376701355
to: 0.639999985694885 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.022746 0.043009 0.053874 0.022698
0.005706 0.006559 0.006685 0.006466 [error]
Peak 0.014402 0.049088 0.063172 0.016031
0.007097 0.008283 0.008122 0.008007 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.592 0.048 0.640
T90 0.512 0.048 0.560
T50 0.256 0.080 0.336
Peak 1.000 -0.156 0.844
====== 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 -0.886 -0.248 0.260 - - - 1.55e-02 -2.26e-03 2.24e-03 48.490 57
CPL -0.520 -0.489 1.115 230.197 -230.197 -230.197 2.27e-02 -9.05e-03 4.40e-02 48.030 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 -0.795 -0.264 0.281 - - - 9.88e-03 -1.68e-03 1.67e-03 63.430 57
CPL 0.965 -1.346 1.944 95.799 -23.609 117.239 5.90e-02 -5.90e-02 2.93e-01 58.000 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 6.62e-09 1.78e-08 3.85e-08 2.17e-07 1.04e-07 2.80e-07 erg/cm2
90%_error_low -1.86e-09 -3.16e-09 -6.17e-09 -7.01e-08 -1.64e-08 -7.44e-08 erg/cm2
90%_error_hi 2.04e-09 3.08e-09 6.09e-09 9.25e-08 1.66e-08 9.44e-08 erg/cm2
Peak flux PL 2.08e-01 3.19e-01 3.68e-01 8.14e-01 1.14e+00 1.71e+00 ph/cm2/s
90%_error_low -6.62e-02 -6.82e-02 -6.30e-02 -2.57e-01 -1.89e-01 -3.15e-01 ph/cm2/s
90%_error_hi 7.49e-02 6.74e-02 6.26e-02 3.31e-01 1.90e-01 3.42e-01 ph/cm2/s
Fluence CPL 6.06e-09 1.82e-08 3.99e-08 1.32e-07 1.02e-07 1.97e-07 erg/cm2
90%_error_low -2.30e-09 -3.38e-09 -7.07e-09 -8.88e-08 -1.77e-08 -8.98e-08 erg/cm2
90%_error_hi 2.17e-09 3.52e-09 7.41e-09 2.00e-07 1.75e-08 1.69e-07 erg/cm2
Peak flux CPL 1.30e-01 3.44e-01 4.34e-01 2.20e-01 1.07e+00 1.13e+00 ph/cm2/s
90%_error_low -7.32e-02 -8.46e-02 -8.13e-02 -1.32e-01 -1.96e-01 -2.38e-01 ph/cm2/s
90%_error_hi 9.00e-02 8.38e-02 8.47e-02 3.32e-01 1.98e-01 3.55e-01 ph/cm2/s
======================================================================
Image
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 0.048 sec. to 0.640 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.88569 ( -0.248086 0.260389 ) Norm@50keV : 1.55121E-02 ( -0.00225674 0.0022446 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.49 using 59 PHA bins. # Reduced chi-squared = 0.8507 for 57 degrees of freedom # Null hypothesis probability = 7.814769e-01 Photon flux (15-150 keV) in 0.592 sec: 1.78028 ( -0.25807 0.25851 ) ph/cm2/s Energy fluence (15-150 keV) : 1.03648e-07 ( -1.64429e-08 1.66205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.048 sec. to 0.640 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.519825 ( -0.489487 1.11542 ) Epeak [keV] : 230.197 ( -230.197 -230.197 ) Norm@50keV : 2.26659E-02 ( -0.0090471 0.0440328 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.03 using 59 PHA bins. # Reduced chi-squared = 0.8577 for 56 degrees of freedom # Null hypothesis probability = 7.667165e-01 Photon flux (15-150 keV) in 0.592 sec: 1.75557 ( -0.26635 0.2657 ) ph/cm2/s Energy fluence (15-150 keV) : 1.01511e-07 ( -1.77229e-08 1.74932e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.156 sec. to 0.844 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.794507 ( -0.263769 0.281191 ) Norm@50keV : 9.88203E-03 ( -0.00168132 0.00166625 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.43 using 59 PHA bins. # Reduced chi-squared = 1.113 for 57 degrees of freedom # Null hypothesis probability = 2.600729e-01 Photon flux (15-150 keV) in 1 sec: 1.13596 ( -0.189092 0.1897 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15766e-07 ( -2.03437e-08 2.05479e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 0.844 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.965177 ( -1.34587 1.94412 ) Epeak [keV] : 95.7994 ( -23.6092 117.239 ) Norm@50keV : 5.90331E-02 ( -0.0590331 0.293154 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.00 using 59 PHA bins. # Reduced chi-squared = 1.036 for 56 degrees of freedom # Null hypothesis probability = 4.012907e-01 Photon flux (15-150 keV) in 1 sec: 1.06515 ( -0.196332 0.19759 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04616e-07 ( -2.20084e-08 2.2661e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.512 sec. Hardness ratio (energy fluence ratio) = 2.16496002702
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.4380075e-08 S(50-150 keV) = 7.927014e-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.
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: -239.200000 0.048000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 344.9402 40.1588 2.3 56.9 -2.0 6.7419 5.1 ------ UNKNOWN 352.6609 5.6798 3.3 21.9 -8.1 1.0363 3.5 556.2 UNKNOWN 342.3449 11.0188 2.0 31.3 -23.1 1.7785 5.9 ------ UNKNOWN 324.5088 -65.5491 2.7 55.9 -151.4 6.5375 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.048000 0.640000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 19.9968 -30.3404 1.0 24.0 145.0 0.1540 11.9 ------ UNKNOWN 354.7883 16.8922 2.0 32.3 2.4 0.0729 5.8 ------ UNKNOWN 320.6991 1.2972 2.1 42.1 -59.0 0.1708 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 58.500600 962.942500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 32.9439 -2.3326 2.4 30.6 33.1 3.4960 4.7 ------ UNKNOWN 55.7125 -76.2526 2.8 48.9 176.3 6.4551 4.1 ------ UNKNOWN 307.3244 -71.2405 2.8 55.9 -151.4 14.5614 4.1 ------ UNKNOWN 338.4685 -9.8972 2.7 43.6 -64.1 13.7698 4.2 ------ UNKNOWN 342.9805 7.8117 3.8 52.1 -42.2 10.5510 3.0 ------ UNKNOWN 324.4788 -47.2608 3.6 45.3 -121.3 9.2070 3.2 ------ UNKNOWN