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 Jul 22 13:30:44 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger703176
======================================================================
Trigger: 00703176 Segment: 000
BAT Trigger Time: 489445344 [s; MET]
Trigger Stop: 489445408 [s; MET]
UTC: 2016-07-05T21:02:07.482980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.085793209721 Dec: 46.7215352735169 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.56
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.56
Analysis Position: [ source = BAT ]
RA: 168.085793209721 Dec: 46.7215352735169 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 168.105784083166 Dec: 46.7053148422327 [deg; J2000]
{ 11h 12m 25.4s , +46d 42' 19.1" }
+/- 2.31217469878328 [arcmin] (estimated 90% radius based on SNR)
+/- 0.846992371840582 [arcmin] (formal 1-sigma fit error)
SNR: 9.18520572336769
Angular difference between the analysis and refined position is 1.274172 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 54.5799999237061 +/- 12.5740159248871
Measured from: -5.05199998617172
to: 49.5279999375343 [s; relative to TRIGTIME]
T50: 28.1519999504089 +/- 11.1539045996016
Measured from: 4.38800001144409
to: 32.539999961853 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.0440000295639
to: 27.0440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.4840000271797
to: 55.1320000290871 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.502801 0.326508 0.355894 0.056006
0.052665 0.054669 0.047991 0.043028 [error]
Peak 0.024146 0.013088 0.015204 0.005213
0.006405 0.006326 0.005617 0.005391 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 69.616 -14.484 55.132
T90 54.580 -5.052 49.528
T50 28.152 4.388 32.540
Peak 1.000 26.044 27.044
====== 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 -1.756 -0.270 0.254 - - - 1.13e-03 -1.70e-04 1.64e-04 55.060 57
CPL -1.774 -1.586 -0.214 9999.360 -9767.388 -9999.360 1.12e-03 -1.12e-03 1.15e-04 55.080 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 -2.165 -1.124 0.848 - - - 2.96e-03 -1.80e-03 1.52e-03 68.780 57
CPL -3.402 -0.966 1.393 385.774 -14.004 -385.774 7.46e-04 -7.46e-04 2.50e-03 66.370 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 1.28e-07 2.01e-07 2.38e-07 5.46e-07 7.26e-07 1.11e-06 erg/cm2
90%_error_low -2.64e-08 -2.56e-08 -5.01e-08 -2.09e-07 -1.11e-07 -2.59e-07 erg/cm2
90%_error_hi 2.76e-08 2.56e-08 4.96e-08 2.80e-07 1.13e-07 3.15e-07 erg/cm2
Peak flux PL 2.32e-01 1.58e-01 7.03e-02 4.33e-02 4.82e-01 5.04e-01 ph/cm2/s
90%_error_low -1.17e-01 -6.30e-02 -7.03e-02 -4.33e-02 -1.55e-01 -1.68e-01 ph/cm2/s
90%_error_hi 1.16e-01 5.31e-02 5.66e-02 1.12e-01 1.55e-01 1.70e-01 ph/cm2/s
Fluence CPL 1.20e-07 N/A 1.57e-07 5.44e-07 N/A 1.09e-06 erg/cm2
90%_error_low -3.13e-08 -2.56e-08 -6.66e-08 N/A -1.11e-07 -2.83e-07 erg/cm2
90%_error_hi 3.12e-08 2.56e-08 3.27e-08 N/A 1.13e-07 3.22e-07 erg/cm2
Peak flux CPL 2.15e-01 6.08e-02 9.95e-03 2.23e-03 2.87e-01 2.90e-01 ph/cm2/s
90%_error_low -1.10e-01 -6.08e-02 -9.95e-03 N/A -1.65e-01 N/A ph/cm2/s
90%_error_hi 1.11e-01 1.15e-01 3.97e-02 N/A 2.52e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 168.1058 46.7053 0.0210 32.0581 9.3282 1.0649220 9.185 TRIG_00703176 Foreground time interval of the image: -14.484 55.132 (delta_t = 69.616 [sec]) Background time interval of the image: -239.000 -14.484 (delta_t = 224.516 [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 -14.484 sec. to 55.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.75626 ( -0.269535 0.254306 ) Norm@50keV : 1.12972E-03 ( -0.000170447 0.000163567 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.06 using 59 PHA bins. # Reduced chi-squared = 0.9659 for 57 degrees of freedom # Null hypothesis probability = 5.483111e-01 Photon flux (15-150 keV) in 69.62 sec: 0.153118 ( -0.019677 0.019703 ) ph/cm2/s Energy fluence (15-150 keV) : 7.25614e-07 ( -1.11451e-07 1.13235e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.484 sec. to 55.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.99651 ( -0.366407 1.00647 ) Epeak [keV] : 298.135 ( -65.0829 -297.055 ) Norm@50keV : 3.01028E-04 ( -0.000303212 0.000935992 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.79 using 59 PHA bins. # Reduced chi-squared = 0.9427 for 56 degrees of freedom # Null hypothesis probability = 5.970501e-01 Photon flux (15-150 keV) in 69.62 sec: 0.153760 ( -0.021118 0.019642 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 26.044 sec. to 27.044 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.16526 ( -1.12227 0.849327 ) Norm@50keV : 2.96313E-03 ( -0.00179457 0.00152035 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.78 using 59 PHA bins. # Reduced chi-squared = 1.207 for 57 degrees of freedom # Null hypothesis probability = 1.362883e-01 Photon flux (15-150 keV) in 1 sec: 0.481793 ( -0.155359 0.155343 ) ph/cm2/s Energy fluence (15-150 keV) : 2.77013e-08 ( -1.24499e-08 1.38955e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.044 sec. to 27.044 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.79104 ( -0.571492 1.78708 ) Epeak [keV] : 448.167 ( -77.7611 -449.531 ) Norm@50keV : 5.09166E-04 ( -0.000502991 0.00273926 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.13 using 59 PHA bins. # Reduced chi-squared = 1.181 for 56 degrees of freedom # Null hypothesis probability = 1.667842e-01 Photon flux (15-150 keV) in 1 sec: 0.287483 ( -0.164687 0.251911 ) ph/cm2/s Energy fluence (15-150 keV) : 2.64588e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 54.58 sec. Hardness ratio (energy fluence ratio) = 1.18405000189
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.287243e-07 S(50-150 keV) = 3.96862e-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 = 6.179974737614500E-01, IMY = -1.015129607932960E-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 -14.484000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 112.7480 15.6679 4.8 40.8 -92.3 2.2786 2.4 ------ UNKNOWN 115.2033 -10.6527 2.3 48.0 -129.1 4.6927 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -14.484000 55.132000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 168.1058 46.7053 1.3 32.1 9.3 1.0646 9.2 ------ UNKNOWN 140.3280 -26.6638 2.5 45.5 -168.6 0.7901 4.6 ------ UNKNOWN 132.1833 -7.9289 2.7 33.4 -142.6 0.5289 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 129.300590 963.045900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 251.0197 74.7649 2.3 43.6 25.6 5.0637 5.0 ------ UNKNOWN 134.4039 8.2442 3.2 48.0 -129.1 9.3700 3.6 ------ UNKNOWN 124.9477 22.8520 3.2 41.9 -106.2 9.0865 3.6 ------ UNKNOWN