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: Sun Nov 1 01:33:46 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger657286
======================================================================
Trigger: 00657286 Segment: 000
BAT Trigger Time: 465404678.144 [s; MET]
Trigger Stop: 465404679.168 [s; MET]
UTC: 2015-10-01T15:04:22.932420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.730768614118 Dec: 10.971220915415 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 22.1359436211787 [ if not an image trigger ]
Image S/N Ratio: 11
Analysis Position: [ source = BAT ]
RA: 233.730768614118 Dec: 10.971220915415 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 233.711040658112 Dec: 10.9796414255402 [deg; J2000]
{ 15h 34m 50.6s , +10d 58' 46.7" }
+/- 1.25127035143776 [arcmin] (estimated 90% radius based on SNR)
+/- 0.44621347616881 [arcmin] (formal 1-sigma fit error)
SNR: 22.0823506876487
Angular difference between the analysis and refined position is 1.267108 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 9.82799994945526 +/- 3.19957245018445
Measured from: -5.43999999761581
to: 4.38799995183945 [s; relative to TRIGTIME]
T50: 4.69599992036819 +/- 0.569097539526206
Measured from: -2.63999998569489
to: 2.05599993467331 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.043999969959259
to: 0.956000030040741 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.28799998760223
to: 7.77600002288818 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.224423 0.388510 0.334168 0.110697
0.023915 0.024030 0.021338 0.017762 [error]
Peak 0.033514 0.064080 0.056468 0.013501
0.006666 0.007099 0.006307 0.004906 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 14.064 -6.288 7.776
T90 9.828 -5.440 4.388
T50 4.696 -2.640 2.056
Peak 1.000 -0.044 0.956
====== 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 -1.202 -0.119 0.120 - - - 4.87e-03 -3.23e-04 3.23e-04 44.980 57
CPL -0.964 -0.295 0.495 235.664 -235.664 -235.664 6.30e-03 -1.68e-03 4.27e-03 44.170 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 -1.197 -0.198 0.201 - - - 1.11e-02 -1.30e-03 1.30e-03 54.100 57
CPL -0.603 -0.705 0.975 126.667 -49.168 -126.667 2.13e-02 -9.62e-03 3.80e-02 52.530 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 6.62e-08 1.46e-07 2.54e-07 1.03e-06 6.94e-07 1.49e-06 erg/cm2
90%_error_low -8.46e-09 -1.13e-08 -2.02e-08 -1.74e-07 -5.09e-08 -1.87e-07 erg/cm2
90%_error_hi 8.82e-09 1.12e-08 2.01e-08 1.98e-07 5.12e-08 2.08e-07 erg/cm2
Peak flux PL 3.43e-01 4.14e-01 3.61e-01 5.39e-01 1.31e+00 1.66e+00 ph/cm2/s
90%_error_low -7.33e-02 -5.66e-02 -4.89e-02 -1.39e-01 -1.56e-01 -2.03e-01 ph/cm2/s
90%_error_hi 7.83e-02 5.58e-02 4.84e-02 1.67e-01 1.56e-01 2.07e-01 ph/cm2/s
Fluence CPL 6.28e-08 1.49e-07 2.59e-07 7.28e-07 6.83e-07 1.20e-06 erg/cm2
90%_error_low -1.04e-08 -1.25e-08 -2.25e-08 -3.33e-07 -5.60e-08 -3.33e-07 erg/cm2
90%_error_hi 1.06e-08 1.27e-08 2.29e-08 3.50e-07 5.56e-08 3.62e-07 erg/cm2
Peak flux CPL 3.01e-01 4.32e-01 3.83e-01 2.99e-01 1.28e+00 1.42e+00 ph/cm2/s
90%_error_low -9.05e-02 -6.33e-02 -5.78e-02 -1.59e-01 -1.63e-01 -2.38e-01 ph/cm2/s
90%_error_hi 9.37e-02 6.53e-02 5.95e-02 2.96e-01 1.62e-01 3.53e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 233.7110 10.9796 0.0087 2.3963 178.5098 1.0837381 22.082 TRIG_00657286 Foreground time interval of the image: -6.288 7.776 (delta_t = 14.064 [sec]) Background time interval of the image: -463.743 -446.933 (delta_t = 16.811 [sec]) -239.144 -6.288 (delta_t = 232.856 [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 -6.288 sec. to 7.776 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20191 ( -0.119024 0.120308 ) Norm@50keV : 4.86950E-03 ( -0.000322747 0.000322725 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.98 using 59 PHA bins. # Reduced chi-squared = 0.7891 for 57 degrees of freedom # Null hypothesis probability = 8.754914e-01 Photon flux (15-150 keV) in 14.06 sec: 0.571737 ( -0.039287 0.039362 ) ph/cm2/s Energy fluence (15-150 keV) : 6.94314e-07 ( -5.09075e-08 5.12338e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.288 sec. to 7.776 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.963716 ( -0.295476 0.495008 ) Epeak [keV] : 235.664 ( -235.665 -235.665 ) Norm@50keV : 6.30063E-03 ( -0.00167587 0.00427238 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.17 using 59 PHA bins. # Reduced chi-squared = 0.7888 for 56 degrees of freedom # Null hypothesis probability = 8.735262e-01 Photon flux (15-150 keV) in 14.06 sec: 0.564831 ( -0.041404 0.041381 ) ph/cm2/s Energy fluence (15-150 keV) : 6.82818e-07 ( -5.59658e-08 5.55539e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.044 sec. to 0.956 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19743 ( -0.198223 0.201016 ) Norm@50keV : 1.11419E-02 ( -0.00129781 0.00129781 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.10 using 59 PHA bins. # Reduced chi-squared = 0.9491 for 57 degrees of freedom # Null hypothesis probability = 5.847220e-01 Photon flux (15-150 keV) in 1 sec: 1.30736 ( -0.15615 0.15646 ) ph/cm2/s Energy fluence (15-150 keV) : 1.13133e-07 ( -1.45913e-08 1.47168e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 0.956 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.602522 ( -0.704979 0.974903 ) Epeak [keV] : 126.667 ( -49.1677 -126.667 ) Norm@50keV : 2.13023E-02 ( -0.00962459 0.0380381 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.53 using 59 PHA bins. # Reduced chi-squared = 0.9380 for 56 degrees of freedom # Null hypothesis probability = 6.070013e-01 Photon flux (15-150 keV) in 1 sec: 1.27554 ( -0.16314 0.16234 ) ph/cm2/s Energy fluence (15-150 keV) : 1.09109e-07 ( -1.59296e-08 1.58104e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 9.828 sec. Hardness ratio (energy fluence ratio) = 1.73884141852
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.121651e-07 S(50-150 keV) = 4.821556e-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 = -4.183390703165987E-02, IMY = -1.088327625007844E-03
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: -463.743400 -446.932600 -239.143600 -6.288000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9953 -15.6319 0.4 31.2 -174.4 8.1558 30.1 1.0 Sco X-1 254.4385 35.3627 8.0 29.9 67.2 0.6176 1.4 1.5 Her X-1 256.1258 -37.8490 695.5 55.5 -173.2 -0.0132 -0.0 6.6 4U 1700-377 256.4194 -36.4586 40.0 54.4 -174.3 -0.2268 -0.3 2.3 GX 349+2 262.9989 -24.7447 154.6 48.1 171.1 0.0428 0.1 0.6 GX 1+4 268.3772 -1.5084 7.9 38.5 139.0 0.7886 1.5 3.4 SW J1753.5-0127 270.2649 -25.1024 4.0 53.0 165.4 -3.1151 -2.9 1.7 GX 5-1 270.2267 -25.8184 6.1 53.5 166.1 -2.1343 -1.9 6.1 GRS 1758-258 273.8610 -13.9701 0.0 49.1 151.3 1.1895 1.1 9.3 GX 17+2 263.1579 -33.8883 16.8 55.3 178.4 -0.7232 -0.7 9.0 GX 354-0 254.3176 -15.3003 2.5 35.7 171.4 1.4749 4.7 ------ UNKNOWN 210.3304 -26.7687 2.2 45.2 -122.3 5.0854 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.288000 7.776000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.7912 -15.5864 31.8 31.1 -174.1 0.0196 0.4 11.3 Sco X-1 254.3468 35.4541 7.3 29.9 67.0 -0.1297 -1.6 8.6 Her X-1 256.0174 -37.8879 6.0 55.5 -173.1 0.3323 1.9 3.0 4U 1700-377 256.4820 -36.4718 3.5 54.4 -174.3 0.5157 3.3 3.7 GX 349+2 263.0229 -24.7714 4.4 48.2 171.1 -0.3271 -2.6 1.7 GX 1+4 268.2703 -1.5773 154.7 38.4 139.1 -0.0081 -0.1 9.5 SW J1753.5-0127 270.2117 -25.1595 5.5 53.0 165.5 0.4761 2.1 6.2 GX 5-1 270.3973 -25.7475 5.6 53.6 165.9 0.4887 2.1 5.1 GRS 1758-258 274.0026 -13.8801 9.5 49.2 151.1 -0.2524 -1.2 9.4 GX 17+2 262.9889 -33.8344 190.6 55.2 178.5 -0.0137 -0.1 0.0 GX 354-0 233.7110 10.9796 0.5 2.4 178.5 1.0836 22.1 ------ UNKNOWN 220.2488 -24.9079 2.5 39.8 -133.2 0.3759 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 44.156600 962.894200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9976 -15.6360 0.3 28.9 171.8 30.8604 43.3 1.1 Sco X-1 254.6226 35.3914 16.0 30.9 49.2 0.7749 0.7 8.6 Her X-1 255.9255 -37.7023 3.9 52.9 172.7 6.9260 3.0 9.0 4U 1700-377 256.3402 -36.4975 30.6 52.0 171.6 0.8549 0.4 6.4 GX 349+2 262.9943 -24.5932 11.9 45.6 156.2 2.0685 1.0 9.2 GX 1+4 268.2445 -1.6281 0.0 36.6 122.8 1.0112 0.7 12.9 SW J1753.5-0127 270.2158 -25.2733 8.1 50.8 150.7 4.8093 1.4 12.2 GX 5-1 270.3410 -25.7491 4.2 51.2 151.1 9.0052 2.7 2.1 GRS 1758-258 274.1202 -13.8402 6.0 47.1 135.5 6.0908 1.9 13.5 GX 17+2 262.9833 -33.8447 175.3 52.8 164.0 -0.1914 -0.1 0.7 GX 354-0 267.4860 42.0613 3.1 42.8 52.1 9.1160 3.8 ------ UNKNOWN 254.5026 29.5213 3.0 26.8 57.9 3.7756 3.8 ------ UNKNOWN 237.6819 19.6585 2.8 9.5 37.9 2.7824 4.2 ------ UNKNOWN 216.9867 19.4325 2.2 18.2 -45.7 3.2382 5.3 ------ UNKNOWN 199.1754 41.3649 3.3 42.9 -24.0 3.9738 3.5 ------ UNKNOWN 233.7498 -46.5729 3.5 57.6 -165.3 9.6853 3.3 ------ UNKNOWN 178.8831 48.6962 3.5 58.9 -24.4 19.9616 3.2 ------ UNKNOWN 217.1422 -45.3705 2.9 58.3 -151.7 14.7891 4.0 ------ UNKNOWN 200.5763 -11.9061 3.5 40.1 -109.1 7.4326 3.3 ------ UNKNOWN 211.7776 -40.4966 4.8 55.3 -145.1 10.5874 2.4 ------ UNKNOWN