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: Wed Jan 4 17:38:48 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger727167
======================================================================
Trigger: 00727167 Segment: 000
BAT Trigger Time: 503630872 [s; MET]
Trigger Stop: 503630976 [s; MET]
UTC: 2016-12-17T01:27:34.681680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.637595876745 Dec: 52.3891561258775 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.21
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.21
Analysis Position: [ source = BAT ]
RA: 150.637595876745 Dec: 52.3891561258775 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 150.646957630497 Dec: 52.3410920192738 [deg; J2000]
{ 10h 02m 35.3s , +52d 20' 27.9" }
+/- 2.04522115432023 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07701107934685 [arcmin] (formal 1-sigma fit error)
SNR: 10.9446959174136
Angular difference between the analysis and refined position is 2.904172 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 12.0359999537468 +/- 2.44943262012102
Measured from: 35.8999999761581
to: 47.9359999299049 [s; relative to TRIGTIME]
T50: 6.58799993991852 +/- 2.36849407779991
Measured from: 37.7039999961853
to: 44.2919999361038 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 42.6439999938011
to: 43.6439999938011 [s; relative to TRIGTIME]
Total Fluence
Measured from: 32.8719999790192
to: 48.7480000257492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.230025 0.189550 0.048874 0.009855
0.024080 0.024565 0.020366 0.017398 [error]
Peak 0.031207 0.019587 0.002324 0.002651
0.006018 0.006260 0.005141 0.004311 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 15.876 32.872 48.748
T90 12.036 35.900 47.936
T50 6.588 37.704 44.292
Peak 1.000 42.644 43.644
====== 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 -2.603 -0.349 0.304 - - - 1.21e-03 -3.16e-04 3.20e-04 60.630 57
CPL -1.252 -1.058 2.084 18.267 -16.729 10.437 9.50e-03 -9.50e-03 2.54e-01 58.200 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 -2.615 -0.822 0.604 - - - 2.04e-03 -1.15e-03 1.25e-03 68.870 57
CPL -0.964 N/A N/A 18.109 N/A N/A 3.11e-02 N/A N/A 68.230 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 6.98e-08 6.61e-08 4.35e-08 4.45e-08 1.98e-07 2.24e-07 erg/cm2
90%_error_low -1.13e-08 -1.18e-08 -1.45e-08 -2.26e-08 -3.58e-08 -4.87e-08 erg/cm2
90%_error_hi 1.14e-08 1.14e-08 1.64e-08 3.54e-08 3.79e-08 5.85e-08 erg/cm2
Peak flux PL 2.49e-01 1.31e-01 4.27e-02 1.79e-02 4.32e-01 4.40e-01 ph/cm2/s
90%_error_low -8.02e-02 -5.23e-02 -2.75e-02 -1.79e-02 -1.32e-01 -1.37e-01 ph/cm2/s
90%_error_hi 8.03e-02 4.89e-02 3.66e-02 3.58e-02 1.33e-01 1.41e-01 ph/cm2/s
Fluence CPL 6.81e-08 7.45e-08 3.10e-08 3.92e-09 1.77e-07 1.77e-07 erg/cm2
90%_error_low -1.22e-08 N/A -1.87e-08 N/A -3.28e-08 -3.32e-08 erg/cm2
90%_error_hi 1.20e-08 N/A 2.17e-08 N/A 4.03e-08 5.06e-08 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -8.02e-02 -5.23e-02 -2.75e-02 -1.79e-02 -1.32e-01 -1.37e-01 ph/cm2/s
90%_error_hi 8.03e-02 4.89e-02 3.66e-02 3.58e-02 1.33e-01 1.41e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 150.6470 52.3411 0.0176 5.2311 -58.3355 0.5131218 10.945 TRIG_00727167 Foreground time interval of the image: 32.872 48.748 (delta_t = 15.876 [sec]) Background time interval of the image: -337.799 -310.156 (delta_t = 27.643 [sec]) -239.000 32.872 (delta_t = 271.872 [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 32.872 sec. to 48.748 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.60255 ( -0.348751 0.303881 ) Norm@50keV : 1.20796E-03 ( -0.000315673 0.000319805 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.63 using 59 PHA bins. # Reduced chi-squared = 1.064 for 57 degrees of freedom # Null hypothesis probability = 3.463845e-01 Photon flux (15-150 keV) in 15.88 sec: 0.253067 ( -0.035461 0.035498 ) ph/cm2/s Energy fluence (15-150 keV) : 1.97657e-07 ( -3.58224e-08 3.79299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.872 sec. to 48.748 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25161 ( -1.05805 2.08377 ) Epeak [keV] : 18.2668 ( -16.7256 10.4402 ) Norm@50keV : 9.49867E-03 ( -0.00949383 0.253715 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.20 using 59 PHA bins. # Reduced chi-squared = 1.039 for 56 degrees of freedom # Null hypothesis probability = 3.942713e-01 Photon flux (15-150 keV) in 15.88 sec: 0.246701 ( -0.035077 0.035471 ) ph/cm2/s Energy fluence (15-150 keV) : 1.76946e-07 ( -3.27643e-08 4.03393e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 42.644 sec. to 43.644 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.61465 ( -0.821776 0.60386 ) Norm@50keV : 2.04484E-03 ( -0.00114677 0.00124542 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.87 using 59 PHA bins. # Reduced chi-squared = 1.208 for 57 degrees of freedom # Null hypothesis probability = 1.347618e-01 Photon flux (15-150 keV) in 1 sec: 0.431724 ( -0.132322 0.133388 ) ph/cm2/s Energy fluence (15-150 keV) : 2.115e-08 ( -8.35854e-09 9.68543e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 42.644 sec. to 43.644 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.963694 ( ) Epeak [keV] : 18.1091 ( ) Norm@50keV : 3.11054E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.23 using 59 PHA bins. # Reduced chi-squared = 1.218 for 56 degrees of freedom # Null hypothesis probability = 1.265387e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 12.036 sec. Hardness ratio (energy fluence ratio) = 0.658658021951
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.3590979e-07 S(50-150 keV) = 6.174946e-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 = 4.806145865922342E-02, IMY = 7.792598460053093E-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: -337.799400 -310.156200 -239.000000 32.872000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 145.0533 8.3375 2.7 45.2 18.1 2.1667 4.3 ------ UNKNOWN 190.8309 19.0228 5.1 50.7 -44.4 3.3269 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 32.872000 48.748000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 96.3441 72.6348 2.5 27.0 174.0 0.2347 4.6 ------ UNKNOWN 150.6470 52.3411 1.1 5.2 -58.3 0.5131 10.9 ------ UNKNOWN 171.0804 3.5523 2.7 55.3 -13.8 0.6445 4.3 ------ UNKNOWN 190.5354 73.1688 2.6 27.9 -130.3 0.2367 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 143.500600 963.057200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 137.4926 31.7778 2.1 22.7 34.3 2.7777 5.4 ------ UNKNOWN 228.0095 76.2493 2.9 36.8 -152.9 3.0294 4.0 ------ UNKNOWN 183.6172 51.0590 3.7 20.3 -95.2 1.7358 3.1 ------ UNKNOWN 187.0670 11.1130 3.3 50.6 -44.6 11.4465 3.5 ------ UNKNOWN