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: Mon Feb 13 11:04:54 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger732526
======================================================================
Trigger: 00732526 Segment: 000
BAT Trigger Time: 505994663.936 [s; MET]
Trigger Stop: 505994664.96 [s; MET]
UTC: 2017-01-13T10:04:05.482200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 61.6485165726425 Dec: -71.9246030205622 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 13.228756555323 [ if not an image trigger ]
Image S/N Ratio: 8.08
Analysis Position: [ source = BAT ]
RA: 61.6485165726425 Dec: -71.9246030205622 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 61.7491467807614 Dec: -71.9361164423602 [deg; J2000]
{ 04h 06m 59.8s , -71d 56' 10.0" }
+/- 1.32058810340737 [arcmin] (estimated 90% radius based on SNR)
+/- 0.45460744495699 [arcmin] (formal 1-sigma fit error)
SNR: 20.4453029707989
Angular difference between the analysis and refined position is 1.996111 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 20.2959999442101 +/- 4.33263519239863
Measured from: 0.259999990463257
to: 20.5559999346733 [s; relative to TRIGTIME]
T50: 10.5759999752045 +/- 0.873109423105914
Measured from: 2.18000000715256
to: 12.755999982357 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.63200002908707
to: 2.63200002908707 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.607999980449677
to: 22.9319999814034 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.331638 0.478106 0.326846 0.066324
0.027455 0.028714 0.025303 0.022037 [error]
Peak 0.033271 0.052839 0.044632 0.009014
0.005955 0.006384 0.005819 0.004713 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 23.540 -0.608 22.932
T90 20.296 0.260 20.556
T50 10.576 2.180 12.756
Peak 1.000 1.632 2.632
====== 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: CPL)
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 -1.573 -0.125 0.123 - - - 3.24e-03 -2.41e-04 2.39e-04 75.750 57
CPL -0.741 -0.550 0.632 71.806 -13.871 48.320 8.81e-03 -4.20e-03 9.86e-03 68.660 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 -1.276 -0.223 0.225 - - - 9.04e-03 -1.19e-03 1.19e-03 53.960 57
CPL -0.877 -0.516 0.944 141.697 -141.697 -141.697 1.44e-02 -6.34e-03 2.77e-02 53.230 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 1.04e-07 1.83e-07 2.47e-07 6.81e-07 7.16e-07 1.21e-06 erg/cm2
90%_error_low -1.17e-08 -1.31e-08 -2.44e-08 -1.32e-07 -5.78e-08 -1.54e-07 erg/cm2
90%_error_hi 1.21e-08 1.30e-08 2.44e-08 1.52e-07 5.84e-08 1.70e-07 erg/cm2
Peak flux PL 3.00e-01 3.45e-01 2.85e-01 3.95e-01 1.07e+00 1.33e+00 ph/cm2/s
90%_error_low -6.79e-02 -5.03e-02 -4.59e-02 -1.17e-01 -1.42e-01 -1.84e-01 ph/cm2/s
90%_error_hi 7.22e-02 4.96e-02 4.54e-02 1.45e-01 1.42e-01 1.88e-01 ph/cm2/s
Fluence CPL 9.21e-08 1.99e-07 2.52e-07 2.15e-07 6.63e-07 7.58e-07 erg/cm2
90%_error_low -1.41e-08 -1.68e-08 -2.74e-08 -1.05e-07 -6.58e-08 -1.24e-07 erg/cm2
90%_error_hi 1.44e-08 1.73e-08 2.73e-08 2.23e-07 6.71e-08 2.27e-07 erg/cm2
Peak flux CPL 2.80e-01 3.59e-01 2.95e-01 2.46e-01 1.06e+00 1.18e+00 ph/cm2/s
90%_error_low -7.89e-02 -2.93e-02 -5.02e-02 -1.49e-01 -1.46e-01 -2.16e-01 ph/cm2/s
90%_error_hi 8.18e-02 6.00e-02 5.19e-02 1.93e-01 1.46e-01 2.57e-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 -0.608 sec. to 22.932 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57293 ( -0.124996 0.123133 ) Norm@50keV : 3.24103E-03 ( -0.000240956 0.000239348 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.75 using 59 PHA bins. # Reduced chi-squared = 1.329 for 57 degrees of freedom # Null hypothesis probability = 4.898541e-02 Photon flux (15-150 keV) in 23.54 sec: 0.413084 ( -0.029125 0.029148 ) ph/cm2/s Energy fluence (15-150 keV) : 7.16073e-07 ( -5.77688e-08 5.84364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.608 sec. to 22.932 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.740936 ( -0.549575 0.632466 ) Epeak [keV] : 71.8058 ( -13.8714 48.3201 ) Norm@50keV : 8.81318E-03 ( -0.00419825 0.00985906 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.66 using 59 PHA bins. # Reduced chi-squared = 1.226 for 56 degrees of freedom # Null hypothesis probability = 1.193269e-01 Photon flux (15-150 keV) in 23.54 sec: 0.396412 ( -0.031022 0.031012 ) ph/cm2/s Energy fluence (15-150 keV) : 6.63463e-07 ( -6.57588e-08 6.71483e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.632 sec. to 2.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27602 ( -0.223172 0.224978 ) Norm@50keV : 9.03707E-03 ( -0.00119414 0.0011913 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.96 using 59 PHA bins. # Reduced chi-squared = 0.9467 for 57 degrees of freedom # Null hypothesis probability = 5.897724e-01 Photon flux (15-150 keV) in 1 sec: 1.07354 ( -0.142008 0.14214 ) ph/cm2/s Energy fluence (15-150 keV) : 8.98463e-08 ( -1.33994e-08 1.35869e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.632 sec. to 2.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.877058 ( -0.516212 0.944472 ) Epeak [keV] : 141.697 ( -141.696 -141.696 ) Norm@50keV : 1.43887E-02 ( -0.00634139 0.0277014 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.23 using 59 PHA bins. # Reduced chi-squared = 0.9506 for 56 degrees of freedom # Null hypothesis probability = 5.803140e-01 Photon flux (15-150 keV) in 1 sec: 1.05740 ( -0.145906 0.1457 ) ph/cm2/s Energy fluence (15-150 keV) : 8.69441e-08 ( -1.48749e-08 1.47533e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 20.296 sec. Hardness ratio (energy fluence ratio) = 1.2618859892
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.9143665e-07 S(50-150 keV) = 3.720195e-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.
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: -617.735390 -598.698900 -239.936000 -0.608000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4875 -60.5651 2.7 46.2 162.2 2.2830 4.2 6.1 Cen X-3 186.6418 -62.7809 87.2 44.8 173.2 0.0576 0.1 0.8 GX 301-2 106.3770 -53.1876 2.3 41.2 112.1 4.3684 4.9 ------ UNKNOWN 69.8743 -41.9374 3.5 40.5 70.8 2.8973 3.3 ------ UNKNOWN 33.1253 -19.4156 3.8 54.2 21.0 3.2990 3.0 ------ UNKNOWN 26.6529 -20.4134 2.5 52.5 13.5 3.4420 4.7 ------ UNKNOWN 302.7793 -51.1457 3.0 36.2 -95.9 1.9725 3.8 ------ UNKNOWN 263.0323 -50.4592 2.9 48.0 -129.0 3.9720 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.608000 12.364610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.6974 -60.5401 0.0 46.2 162.4 -0.0623 -0.6 12.3 Cen X-3 186.7757 -62.8715 8.6 44.7 173.3 0.1068 1.3 6.9 GX 301-2 61.7491 -71.9361 0.6 14.6 109.2 0.8368 20.4 ------ UNKNOWN 177.9912 -74.3639 2.4 33.0 170.0 0.2443 4.8 ------ UNKNOWN 215.5980 -54.0722 2.1 52.6 -166.2 0.6782 5.6 ------ UNKNOWN 220.8575 -54.0661 2.5 52.1 -162.3 0.5558 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 48.164600 104.243500 105.064000 962.134000 1878.064000 2000.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3550 -60.6595 2.3 38.8 172.7 4.8188 5.0 2.5 Cen X-3 186.7360 -62.9416 11.1 40.1 -174.8 0.9010 1.0 10.5 GX 301-2 60.3657 -58.2029 3.8 13.7 37.8 1.7103 3.1 ------ UNKNOWN 201.7047 -46.9527 2.6 57.8 -170.6 17.9299 4.4 ------ UNKNOWN 269.3655 -61.3432 3.6 45.4 -121.2 9.4306 3.2 ------ UNKNOWN