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 Jan 13 13:41:19 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger728268
======================================================================
Trigger: 00728268 Segment: 000
BAT Trigger Time: 504310432 [s; MET]
Trigger Stop: 504310496 [s; MET]
UTC: 2016-12-24T22:13:34.642820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 204.824756188297 Dec: -18.0284612983687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.73
Analysis Position: [ source = BAT ]
RA: 204.824756188297 Dec: -18.0284612983687 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 204.819930600987 Dec: -18.0289940205966 [deg; J2000]
{ 13h 39m 16.8s , -18d 01' 44.4" }
+/- 1.8346226518262 [arcmin] (estimated 90% radius based on SNR)
+/- 0.921331668315273 [arcmin] (formal 1-sigma fit error)
SNR: 12.7827124911695
Angular difference between the analysis and refined position is 0.277169 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 47.37600004673 +/- 11.5828977699689
Measured from: 15.6719999909401
to: 63.0480000376701 [s; relative to TRIGTIME]
T50: 17.7600000500679 +/- 5.08510605847718
Measured from: 30.5839999914169
to: 48.3440000414848 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.8759999871254
to: 33.8759999871254 [s; relative to TRIGTIME]
Total Fluence
Measured from: 12.4559999704361
to: 65.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.629340 0.843487 0.230275 0.031859
0.070985 0.072959 0.062040 0.052554 [error]
Peak 0.026091 0.037363 0.018174 0.020324
0.010089 0.010155 0.008697 0.007269 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 52.720 12.456 65.176
T90 47.376 15.672 63.048
T50 17.760 30.584 48.344
Peak 1.000 32.876 33.876
====== 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 -2.203 -0.215 0.200 - - - 1.96e-03 -3.04e-04 2.99e-04 61.390 57
CPL 0.164 -1.251 1.810 34.433 -5.670 5.435 5.45e-02 -5.45e-02 7.11e-01 48.380 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 -1.705 -0.578 0.553 - - - 5.80e-03 -2.03e-03 1.97e-03 54.280 57
CPL -1.359 -0.998 6.005 85.344 -85.344 -85.344 9.00e-03 N/A N/A 54.220 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 2.57e-07 3.08e-07 2.68e-07 3.98e-07 9.72e-07 1.23e-06 erg/cm2
90%_error_low -3.82e-08 -3.68e-08 -5.41e-08 -1.35e-07 -1.31e-07 -2.14e-07 erg/cm2
90%_error_hi 3.90e-08 3.67e-08 5.59e-08 1.73e-07 1.34e-07 2.40e-07 erg/cm2
Peak flux PL 2.91e-01 2.59e-01 1.59e-01 1.48e-01 7.72e-01 8.58e-01 ph/cm2/s
90%_error_low -1.43e-01 -8.99e-02 -6.81e-02 -9.47e-02 -2.60e-01 -2.80e-01 ph/cm2/s
90%_error_hi 1.60e-01 8.79e-02 6.66e-02 1.56e-01 2.61e-01 2.80e-01 ph/cm2/s
Fluence CPL 2.23e-07 3.94e-07 2.00e-07 1.72e-08 8.32e-07 8.33e-07 erg/cm2
90%_error_low -4.45e-08 -5.60e-08 -7.94e-08 N/A -1.20e-07 -1.21e-07 erg/cm2
90%_error_hi 4.44e-08 5.73e-08 8.16e-08 N/A 1.34e-07 1.42e-07 erg/cm2
Peak flux CPL 2.80e-01 2.72e-01 1.63e-01 9.59e-02 7.67e-01 8.10e-01 ph/cm2/s
90%_error_low N/A -1.01e-01 N/A -9.59e-02 -2.65e-01 -3.07e-01 ph/cm2/s
90%_error_hi N/A 1.54e-01 N/A 1.08e-01 2.63e-01 3.21e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 204.8199 -18.0290 0.0150 44.0426 -13.3080 1.8435475 12.783 TRIG_00728268 Foreground time interval of the image: 12.456 65.176 (delta_t = 52.720 [sec]) Background time interval of the image: -239.000 12.456 (delta_t = 251.456 [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 12.456 sec. to 65.176 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.20309 ( -0.21471 0.200642 ) Norm@50keV : 1.95988E-03 ( -0.000303625 0.00029885 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.39 using 59 PHA bins. # Reduced chi-squared = 1.077 for 57 degrees of freedom # Null hypothesis probability = 3.216090e-01 Photon flux (15-150 keV) in 52.72 sec: 0.325028 ( -0.037845 0.037855 ) ph/cm2/s Energy fluence (15-150 keV) : 9.7202e-07 ( -1.3106e-07 1.33726e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.456 sec. to 65.176 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.164075 ( -1.27831 1.78244 ) Epeak [keV] : 34.4328 ( -5.66729 5.4378 ) Norm@50keV : 5.45168E-02 ( -0.0585084 0.706999 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.38 using 59 PHA bins. # Reduced chi-squared = 0.8640 for 56 degrees of freedom # Null hypothesis probability = 7.553657e-01 Photon flux (15-150 keV) in 52.72 sec: 0.308394 ( -0.038147 0.038342 ) ph/cm2/s Energy fluence (15-150 keV) : 8.32275e-07 ( -1.19626e-07 1.3381e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 32.876 sec. to 33.876 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70517 ( -0.578333 0.552814 ) Norm@50keV : 5.80432E-03 ( -0.00203377 0.00197063 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.28 using 59 PHA bins. # Reduced chi-squared = 0.9523 for 57 degrees of freedom # Null hypothesis probability = 5.777648e-01 Photon flux (15-150 keV) in 1 sec: 0.772311 ( -0.260077 0.261179 ) ph/cm2/s Energy fluence (15-150 keV) : 5.37279e-08 ( -1.89519e-08 1.92733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.876 sec. to 33.876 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.35911 ( -0.997646 6.00514 ) Epeak [keV] : 85.3437 ( -85.4694 -85.4694 ) Norm@50keV : 9.00349E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.22 using 59 PHA bins. # Reduced chi-squared = 0.9682 for 56 degrees of freedom # Null hypothesis probability = 5.426332e-01 Photon flux (15-150 keV) in 1 sec: 0.767386 ( -0.265272 0.263224 ) ph/cm2/s Energy fluence (15-150 keV) : 5.24505e-08 ( -2.31355e-08 2.00148e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 47.376 sec. Hardness ratio (energy fluence ratio) = 0.86864035522
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.645506e-07 S(50-150 keV) = 4.074932e-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 = 9.411565584139588E-01, IMY = 2.226181971407265E-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: -239.000000 12.456000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4634 35.2660 4.2 35.6 -143.3 0.8585 2.7 4.6 Her X-1
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 12.456000 65.176000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4395 35.1355 122.7 35.6 -143.0 0.0126 0.1 12.4 Her X-1 242.8377 66.7178 2.4 45.3 168.3 0.9462 4.7 ------ UNKNOWN 204.8200 -18.0290 0.9 44.0 -13.3 1.8435 12.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: