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 Jun 26 00:15:42 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger641698
======================================================================
Trigger: 00641698 Segment: 000
BAT Trigger Time: 454402149.44 [s; MET]
Trigger Stop: 454402149.952 [s; MET]
UTC: 2015-05-27T06:48:55.804620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.957781485581 Dec: 4.19407695074873 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 9.07
Analysis Position: [ source = BAT ]
RA: 288.957781485581 Dec: 4.19407695074873 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 288.962786011235 Dec: 4.19625221640243 [deg; J2000]
{ 19h 15m 51.1s , +04d 11' 46.5" }
+/- 0.868057129532653 [arcmin] (estimated 90% radius based on SNR)
+/- 0.288853126344496 [arcmin] (formal 1-sigma fit error)
SNR: 37.2311551353881
Angular difference between the analysis and refined position is 0.326672 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 108.800000011921 +/- 84.1058050290632
Measured from: -106.815999984741
to: 1.98400002717972 [s; relative to TRIGTIME]
T50: 13.0880000591278 +/- 1.67999995946884
Measured from: -16.3840000033379
to: -3.29599994421005 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -13.8679999709129
to: -12.8679999709129 [s; relative to TRIGTIME]
Total Fluence
Measured from: -111.856000006199
to: 12.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.698444 2.277963 1.311061 0.235896
0.088824 0.090265 0.082060 0.080231 [error]
Peak 0.088507 0.148304 0.096675 0.018081
0.008185 0.008800 0.007846 0.006435 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 124.032 -111.856 12.176
T90 108.800 -106.816 1.984
T50 13.088 -16.384 -3.296
Peak 1.000 -13.868 -12.868
====== 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 -1.707 -0.097 0.096 - - - 2.80e-03 -1.54e-04 1.53e-04 54.420 57
CPL -1.408 -0.340 0.410 91.238 -29.372 -91.238 4.04e-03 -1.32e-03 2.58e-03 52.550 56
=== 1-s peak 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 -1.481 -0.121 0.119 - - - 2.23e-02 -1.68e-03 1.67e-03 72.260 57
CPL -0.389 -0.551 0.643 70.472 -11.591 25.814 8.29e-02 -3.96e-02 9.60e-02 59.220 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 5.39e-07 8.73e-07 1.07e-06 2.58e-06 3.21e-06 5.06e-06 erg/cm2
90%_error_low -4.49e-08 -4.43e-08 -8.09e-08 -3.93e-07 -1.86e-07 -4.64e-07 erg/cm2
90%_error_hi 4.61e-08 4.43e-08 8.12e-08 4.41e-07 1.88e-07 5.03e-07 erg/cm2
Peak flux PL 9.00e-01 9.16e-01 6.56e-01 7.50e-01 2.77e+00 3.22e+00 ph/cm2/s
90%_error_low -1.05e-01 -6.94e-02 -6.19e-02 -1.32e-01 -2.02e-01 -2.41e-01 ph/cm2/s
90%_error_hi 1.08e-01 6.92e-02 6.17e-02 1.48e-01 2.02e-01 2.42e-01 ph/cm2/s
Fluence CPL 5.16e-07 8.99e-07 1.07e-06 1.55e-06 3.11e-06 4.04e-06 erg/cm2
90%_error_low -5.28e-08 -5.47e-08 -8.48e-08 -6.92e-07 -2.28e-07 -7.35e-07 erg/cm2
90%_error_hi 5.36e-08 5.58e-08 8.47e-08 1.15e-06 2.28e-07 1.21e-06 erg/cm2
Peak flux CPL 7.58e-01 1.02e+00 6.97e-01 2.49e-01 2.65e+00 2.72e+00 ph/cm2/s
90%_error_low -1.23e-01 -8.84e-02 -7.22e-02 -1.06e-01 -2.09e-01 -2.36e-01 ph/cm2/s
90%_error_hi 1.26e-01 9.12e-02 7.24e-02 1.70e-01 2.09e-01 2.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 288.9628 4.1963 0.0051 10.2673 -91.7735 4.5916489 37.231 TRIG_00641698 Foreground time interval of the image: -43.739 10.261 (delta_t = 54.000 [sec]) Background time interval of the 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 -111.856 sec. to 12.176 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70732 ( -0.0970521 0.09593 ) Norm@50keV : 2.80113E-03 ( -0.000153958 0.000152876 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.42 using 59 PHA bins. # Reduced chi-squared = 0.9547 for 57 degrees of freedom # Null hypothesis probability = 5.726275e-01 Photon flux (15-150 keV) in 124 sec: 0.372992 ( -0.019054 0.019079 ) ph/cm2/s Energy fluence (15-150 keV) : 3.21464e-06 ( -1.8597e-07 1.87734e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -111.856 sec. to 12.176 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40772 ( -0.339918 0.410011 ) Epeak [keV] : 91.2376 ( -29.3724 -91.2384 ) Norm@50keV : 4.04219E-03 ( -0.00132305 0.00258169 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.55 using 59 PHA bins. # Reduced chi-squared = 0.9384 for 56 degrees of freedom # Null hypothesis probability = 6.062838e-01 Photon flux (15-150 keV) in 124 sec: 0.366080 ( -0.020851 0.020837 ) ph/cm2/s Energy fluence (15-150 keV) : 3.10693e-06 ( -2.27534e-07 2.28497e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -13.868 sec. to -12.868 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48132 ( -0.120625 0.119248 ) Norm@50keV : 2.22709E-02 ( -0.00168059 0.00167315 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.26 using 59 PHA bins. # Reduced chi-squared = 1.268 for 57 degrees of freedom # Null hypothesis probability = 8.385973e-02 Photon flux (15-150 keV) in 1 sec: 2.76662 ( -0.20161 0.20171 ) ph/cm2/s Energy fluence (15-150 keV) : 2.11963e-07 ( -1.75748e-08 1.77523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.868 sec. to -12.868 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.388871 ( -0.55083 0.642573 ) Epeak [keV] : 70.4717 ( -11.5908 25.8139 ) Norm@50keV : 8.28883E-02 ( -0.0396163 0.0960287 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.22 using 59 PHA bins. # Reduced chi-squared = 1.058 for 56 degrees of freedom # Null hypothesis probability = 3.588502e-01 Photon flux (15-150 keV) in 1 sec: 2.65385 ( -0.20905 0.20903 ) ph/cm2/s Energy fluence (15-150 keV) : 1.9399e-07 ( -1.95002e-08 1.98161e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 108.8 sec. Hardness ratio (energy fluence ratio) = 1.22495457326
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.4117756e-06 S(50-150 keV) = 1.8028535e-06
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 = -5.606019335997852E-03, IMY = 1.810553663361952E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -43.739400 10.260600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9747 -15.6343 0.8 38.2 110.9 6.8867 14.9 0.4 Sco X-1 254.6596 35.3020 11.1 45.9 -168.4 -0.2408 -1.0 10.2 Her X-1 256.5702 -36.4966 6.9 40.7 74.1 0.9313 1.7 7.9 GX 349+2 263.0416 -24.6858 42.9 28.1 80.5 -0.0569 -0.3 4.0 GX 1+4 268.2875 -1.4248 4.6 13.4 139.0 0.3096 2.5 5.1 SW J1753.5-0127 270.3381 -25.2163 9.8 24.7 67.6 -0.2085 -1.2 8.7 GX 5-1 270.1478 -25.6763 7.5 25.2 67.5 0.2940 1.7 9.3 GRS 1758-258 273.9770 -13.9377 4.1 13.3 76.7 0.3278 2.8 6.2 GX 17+2 276.0475 -30.4475 15.1 28.0 52.9 0.1362 0.8 8.0 H1820-303 285.1132 -24.8012 9.6 22.1 34.1 0.1506 1.2 8.3 HT1900.1-2455 288.7909 11.0375 7.2 15.7 -110.6 0.1884 1.6 5.5 GRS 1915+105 299.6293 35.2621 3.5 41.8 -115.2 1.4306 3.3 4.1 Cyg X-1 263.0234 -33.8815 5.1 35.4 69.8 0.7430 2.3 3.3 GX 354-0 288.9628 4.1962 0.3 10.3 -91.8 4.5914 37.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 45.460600 522.760600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5097 35.3796 3.3 44.5 170.9 3.1131 3.5 3.4 Her X-1 262.9098 -24.6519 5.4 38.4 72.0 2.8910 2.1 7.8 GX 1+4 268.4352 -1.5768 13.3 21.3 106.7 -0.4142 -0.9 8.5 SW J1753.5-0127 270.2335 -25.1055 3.3 34.5 62.9 2.9974 3.5 3.2 GX 5-1 270.5082 -25.7641 4.4 34.9 61.9 2.1442 2.6 11.2 GRS 1758-258 273.9455 -14.0370 3.2 23.5 71.0 1.8691 3.6 3.5 GX 17+2 276.0052 -30.2731 4.0 36.6 50.9 2.4390 2.9 7.0 H1820-303 285.1921 -24.9209 4.6 29.3 39.0 1.2183 2.5 8.5 HT1900.1-2455 288.7922 10.9271 1.5 6.8 -149.3 2.8143 7.6 1.2 GRS 1915+105 299.5930 35.1962 0.5 32.5 -131.7 13.6044 22.9 0.3 Cyg X-1 308.1614 40.9820 3.4 40.7 -125.6 2.8900 3.3 2.9 Cyg X-3 248.1136 44.8750 4.0 54.1 177.1 5.4551 2.9 ------ UNKNOWN 286.5856 14.2716 2.8 10.4 -160.9 1.5342 4.1 ------ UNKNOWN 328.0953 5.2345 2.8 39.0 -61.2 3.8062 4.2 ------ UNKNOWN 290.6787 59.0099 4.9 54.9 -146.9 5.2477 2.4 ------ UNKNOWN