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 13:29:20 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger735326
======================================================================
Trigger: 00735326 Segment: 000
BAT Trigger Time: 507219694.208 [s; MET]
Trigger Stop: 507219706.368 [s; MET]
UTC: 2017-01-27T14:21:15.684000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 174.335826083407 Dec: -45.8518164749582 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.67
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 7.67
Analysis Position: [ source = BAT ]
RA: 174.335826083407 Dec: -45.8518164749582 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 174.36632972461 Dec: -45.8449762071626 [deg; J2000]
{ 11h 37m 27.9s , -45d 50' 41.9" }
+/- 2.26026121638691 [arcmin] (estimated 90% radius based on SNR)
+/- 0.904201261992873 [arcmin] (formal 1-sigma fit error)
SNR: 9.48806116223111
Angular difference between the analysis and refined position is 1.339290 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 67.3759999871254 +/- 12.032902197789
Measured from: -4.89200001955032
to: 62.4839999675751 [s; relative to TRIGTIME]
T50: 36.2519999742508 +/- 11.3712312422895
Measured from: 6.98399996757507
to: 43.2359999418259 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.30799996852875
to: 8.30799996852875 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.49599999189377
to: 65.2680000066757 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.166213 0.313025 0.234871 0.114418
0.048041 0.048701 0.042328 0.038393 [error]
Peak 0.018209 0.013463 0.011916 0.012812
0.005772 0.005751 0.005227 0.004480 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 73.764 -8.496 65.268
T90 67.376 -4.892 62.484
T50 36.252 6.984 43.236
Peak 1.000 7.308 8.308
====== 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 -1.155 -0.295 0.308 - - - 7.01e-04 -1.20e-04 1.20e-04 70.000 57
CPL -0.577 -1.002 1.577 127.581 -127.581 -127.581 1.35e-03 -7.44e-04 6.22e-03 69.330 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.090 -1.057 1.365 - - - 3.03e-03 -1.51e-03 1.07e-03 48.240 57
CPL -1.130 -3.505 0.782 9999.360 N/A N/A 3.05e-03 N/A N/A 48.270 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 4.78e-08 1.09e-07 1.95e-07 8.30e-07 5.32e-07 1.18e-06 erg/cm2
90%_error_low -1.49e-08 -2.18e-08 -3.99e-08 -3.20e-07 -1.01e-07 -3.52e-07 erg/cm2
90%_error_hi 1.64e-08 2.12e-08 3.94e-08 4.47e-07 1.02e-07 4.62e-07 erg/cm2
Peak flux PL 8.36e-02 1.08e-01 1.02e-01 1.71e-01 3.51e-01 4.64e-01 ph/cm2/s
90%_error_low -8.36e-02 -7.25e-02 -5.46e-02 -1.40e-01 -3.51e-01 -1.78e-01 ph/cm2/s
90%_error_hi 9.92e-02 5.12e-02 4.17e-02 4.52e-01 1.33e-01 3.22e-01 ph/cm2/s
Fluence CPL 4.30e-08 1.15e-07 2.03e-07 3.66e-07 5.07e-07 7.27e-07 erg/cm2
90%_error_low -1.55e-08 -2.51e-08 -4.37e-08 -2.89e-07 -6.60e-08 -3.08e-07 erg/cm2
90%_error_hi 1.90e-08 2.69e-08 4.55e-08 7.49e-07 1.14e-07 6.00e-07 erg/cm2
Peak flux CPL 8.37e-02 5.81e-02 2.77e-02 2.24e-02 1.79e-01 1.92e-01 ph/cm2/s
90%_error_low -8.37e-02 N/A -2.77e-02 -2.24e-02 -1.79e-01 -1.92e-01 ph/cm2/s
90%_error_hi 1.02e-01 N/A 1.06e-02 2.16e-02 9.53e-02 9.18e-02 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 -8.496 sec. to 65.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15458 ( -0.295181 0.307627 ) Norm@50keV : 7.01309E-04 ( -0.000120489 0.000120444 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.00 using 59 PHA bins. # Reduced chi-squared = 1.228 for 57 degrees of freedom # Null hypothesis probability = 1.156423e-01 Photon flux (15-150 keV) in 73.76 sec: 8.18319E-02 ( -0.0144065 0.0144555 ) ph/cm2/s Energy fluence (15-150 keV) : 5.3184e-07 ( -1.00837e-07 1.02367e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.496 sec. to 65.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.576837 ( -1.00167 1.5775 ) Epeak [keV] : 127.581 ( -127.583 -127.583 ) Norm@50keV : 1.34511E-03 ( -0.000743642 0.00622305 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.33 using 59 PHA bins. # Reduced chi-squared = 1.238 for 56 degrees of freedom # Null hypothesis probability = 1.087315e-01 Photon flux (15-150 keV) in 73.76 sec: 7.97569E-02 ( -0.0151666 0.0150834 ) ph/cm2/s Energy fluence (15-150 keV) : 5.06851e-07 ( -6.60115e-08 1.14262e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.308 sec. to 8.308 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.09021 ( -1.06229 1.35956 ) Norm@50keV : 3.03462E-03 ( -0.00151033 0.00106994 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.24 using 59 PHA bins. # Reduced chi-squared = 0.8463 for 57 degrees of freedom # Null hypothesis probability = 7.891492e-01 Photon flux (15-150 keV) in 1 sec: 0.351074 ( -0.351074 0.132859 ) ph/cm2/s Energy fluence (15-150 keV) : 3.19271e-08 ( -1.42044e-08 1.36818e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.308 sec. to 8.308 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.15627 ( -2.47841 1.80853 ) Epeak [keV] : 56.4306 ( ) Norm@50keV : 1.01047E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.62 using 59 PHA bins. # Reduced chi-squared = 0.8324 for 56 degrees of freedom # Null hypothesis probability = 8.099817e-01 Photon flux (15-150 keV) in 1 sec: 0.179390 ( -0.17939 0.095286 ) ph/cm2/s Energy fluence (15-150 keV) : 1.17114e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 67.376 sec. Hardness ratio (energy fluence ratio) = 1.79680126021
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.5651807e-07 S(50-150 keV) = 3.753259e-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: -183.107410 -8.496000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4858 -40.4180 5.2 32.6 49.3 0.5815 2.2 8.4 Vela X-1 170.3239 -60.6009 1.8 9.1 -12.6 1.0609 6.4 1.3 Cen X-3 186.6406 -62.8058 1.1 10.0 -62.1 1.7243 10.8 2.2 GX 301-2 162.1048 -40.9385 3.2 17.5 82.3 0.6596 3.6 ------ UNKNOWN 176.8614 -62.0346 2.3 8.9 -34.7 0.8180 5.0 ------ UNKNOWN 221.0182 -5.4242 2.2 58.2 -175.8 5.7223 5.3 ------ UNKNOWN 214.4004 -66.6161 2.7 21.1 -83.5 0.8660 4.3 ------ UNKNOWN 57.4035 -60.1383 2.5 57.7 -15.9 3.9008 4.6 ------ UNKNOWN 3.5234 -75.8790 3.7 50.8 -44.5 2.7895 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.496000 57.092590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5039 -40.6781 5.0 32.5 48.9 0.3685 2.3 7.5 Vela X-1 170.3605 -60.4241 5.6 8.9 -11.9 -0.1934 -2.0 12.0 Cen X-3 186.6046 -62.7381 3.2 10.0 -62.2 -0.3503 -3.6 2.4 GX 301-2 90.7065 -49.4256 2.6 52.3 9.8 1.4814 4.5 ------ UNKNOWN 185.0504 -33.6621 2.7 19.9 145.9 0.4353 4.2 ------ UNKNOWN 174.3663 -45.8450 1.2 8.4 104.5 0.9143 9.5 ------ UNKNOWN 239.0731 -25.0636 2.2 51.6 -144.7 2.0915 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 85.092590 962.916800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5018 -40.5818 1.7 28.5 39.8 4.6523 6.9 2.0 Vela X-1 170.2895 -60.5938 1.4 14.9 -39.1 4.2727 8.0 1.9 Cen X-3 186.7165 -62.7933 0.9 18.3 -65.0 7.3726 12.4 2.1 GX 301-2 178.1457 -16.1991 2.7 29.8 140.5 3.1066 4.3 ------ UNKNOWN 132.7411 -41.9793 2.4 29.9 35.5 3.0986 4.7 ------ UNKNOWN 211.2886 0.8082 3.6 56.9 179.0 11.6386 3.2 ------ UNKNOWN 213.8398 -2.0669 3.4 55.7 -176.5 8.6911 3.4 ------ UNKNOWN 208.5703 -24.6124 2.7 34.7 -162.8 2.6067 4.3 ------ UNKNOWN 176.7581 -61.9654 2.3 16.2 -50.9 2.7345 5.1 ------ UNKNOWN 201.4760 -43.0197 2.3 19.5 -135.4 2.5070 5.0 ------ UNKNOWN 219.1476 -3.1551 2.8 57.8 -170.6 13.8812 4.1 ------ UNKNOWN