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: Tue Sep 29 19:56:26 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger653838
======================================================================
Trigger: 00653838 Segment: 000
BAT Trigger Time: 462710067.968 [s; MET]
Trigger Stop: 462710068.48 [s; MET]
UTC: 2015-08-31T10:34:12.898960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.022515218217 Dec: -25.6495753619322 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.35
Image Trigger?: NO
Rate S/N Ratio: 56.4889369699944 [ if not an image trigger ]
Image S/N Ratio: 14.35
Analysis Position: [ source = BAT ]
RA: 221.022515218217 Dec: -25.6495753619322 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 221.033436831161 Dec: -25.6132800667123 [deg; J2000]
{ 14h 44m 08.0s , -25d 36' 47.8" }
+/- 1.30110922746758 [arcmin] (estimated 90% radius based on SNR)
+/- 0.426125854234988 [arcmin] (formal 1-sigma fit error)
SNR: 20.8839677072435
Angular difference between the analysis and refined position is 2.256438 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 0.919999957084656 +/- 0.11627550390902
Measured from: 0.0199999809265137
to: 0.939999938011169 [s; relative to TRIGTIME]
T50: 0.467999935150146 +/- 0.0735390856872632
Measured from: 0.164000034332275
to: 0.631999969482422 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 1.01999998092651 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.067846 0.130487 0.163532 0.099652
0.011085 0.011444 0.011521 0.009601 [error]
Peak 0.065561 0.126723 0.159109 0.097400
0.010819 0.011194 0.011282 0.009396 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 1.052 -0.032 1.020
T90 0.920 0.020 0.940
T50 0.468 0.164 0.632
Peak 1.000 0.000 1.000
====== 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 -0.712 -0.155 0.162 - - - 2.83e-02 -2.52e-03 2.47e-03 46.160 57
CPL -0.712 -0.149 0.172 9999.360 -9999.360 -9999.360 2.86e-02 -2.35e-03 6.40e-03 46.260 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 -0.713 -0.156 0.163 - - - 2.90e-02 -2.59e-03 2.53e-03 50.170 57
CPL -0.623 -0.240 0.190 971.492 -971.492 -971.492 3.15e-02 -4.86e-03 -6.10e-06 51.170 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 1.83e-08 5.48e-08 1.34e-07 9.11e-07 3.62e-07 1.12e-06 erg/cm2
90%_error_low -3.57e-09 -6.50e-09 -1.06e-08 -1.73e-07 -2.95e-08 -1.76e-07 erg/cm2
90%_error_hi 3.88e-09 6.41e-09 1.06e-08 2.04e-07 2.96e-08 2.04e-07 erg/cm2
Peak flux PL 1.77e-04 2.34e-03 3.67e-02 3.21e+00 1.34e-01 2.87e+00 ph/cm2/s
90%_error_low N/A N/A 4.88e-03 4.05e-01 5.43e-02 7.91e-01 ph/cm2/s
90%_error_hi N/A N/A 3.37e-02 2.16e+00 1.73e-01 2.59e+00 ph/cm2/s
Fluence CPL 1.83e-08 5.48e-08 1.30e-07 9.19e-07 3.63e-07 1.02e-06 erg/cm2
90%_error_low N/A -6.51e-09 N/A -1.76e-07 -3.02e-08 -1.93e-07 erg/cm2
90%_error_hi N/A 6.41e-09 N/A 2.21e-07 2.88e-08 1.62e-07 erg/cm2
Peak flux CPL 5.64e-01 9.13e-01 1.11e+00 2.65e+00 3.35e+00 5.46e+00 ph/cm2/s
90%_error_low N/A -1.13e-01 N/A N/A -2.78e-01 -5.26e-01 ph/cm2/s
90%_error_hi N/A 1.12e-01 N/A N/A 2.79e-01 2.92e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 221.0334 -25.6133 0.0092 31.2218 -59.4135 0.4804796 20.884 TRIG_00653838 Foreground time interval of the image: -0.032 1.020 (delta_t = 1.052 [sec]) Background time interval of the image: -532.767 -516.886 (delta_t = 15.881 [sec]) -239.968 -0.032 (delta_t = 239.936 [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 -0.032 sec. to 1.020 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.711615 ( -0.155385 0.162064 ) Norm@50keV : 2.83488E-02 ( -0.00252151 0.00246537 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.16 using 59 PHA bins. # Reduced chi-squared = 0.8099 for 57 degrees of freedom # Null hypothesis probability = 8.470336e-01 Photon flux (15-150 keV) in 1.052 sec: 3.27391 ( -0.27048 0.27151 ) ph/cm2/s Energy fluence (15-150 keV) : 3.62173e-07 ( -2.95014e-08 2.9583e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 1.020 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.711588 ( -0.149368 0.1716 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 2.86236E-02 ( -0.00234591 0.00640612 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.26 using 59 PHA bins. # Reduced chi-squared = 0.8261 for 56 degrees of freedom # Null hypothesis probability = 8.200935e-01 Photon flux (15-150 keV) in 1.052 sec: 3.27276 ( -0.27057 0.2713 ) ph/cm2/s Energy fluence (15-150 keV) : 3.62791e-07 ( -3.02415e-08 2.88483e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.713312 ( -0.15605 0.162724 ) Norm@50keV : 2.90384E-02 ( -0.00259049 0.00253366 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.17 using 59 PHA bins. # Reduced chi-squared = 0.8802 for 57 degrees of freedom # Null hypothesis probability = 7.270263e-01 Photon flux (15-150 keV) in 1 sec: 0.134332 0.241916 0.220940 0.203492 0.162938 0.130560 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.52379e-07 ( -2.89343e-08 2.90204e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.705309 ( -0.146033 0.284268 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 2.92582E-02 ( -0.002599 0.00225887 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.26 using 59 PHA bins. # Reduced chi-squared = 0.8975 for 56 degrees of freedom # Null hypothesis probability = 6.910151e-01 Photon flux (15-150 keV) in 1 sec: 3.35194 ( -0.27832 0.2791 ) ph/cm2/s Energy fluence (15-150 keV) : 3.53012e-07 ( -2.96865e-08 2.82645e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.92 sec. Hardness ratio (energy fluence ratio) = 2.44258627878
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.306008e-08 S(50-150 keV) = 2.891134e-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 = 3.084284022139763E-01, IMY = 5.218055327131941E-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: -532.767400 -516.885900 -239.968000 -0.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2151 -60.7552 9.0 49.3 -135.0 -1.5148 -1.3 8.5 Cen X-3 186.6465 -62.7722 0.8 41.3 -135.5 6.5296 13.8 0.3 GX 301-2 244.9865 -15.6450 0.3 28.8 -9.5 9.5239 37.4 0.5 Sco X-1 256.2004 -37.9726 0.0 6.5 33.1 0.4261 1.9 12.7 4U 1700-377 256.4338 -36.4070 1.8 8.0 29.5 1.3760 6.5 1.0 GX 349+2 263.0910 -24.7228 13.8 21.0 33.5 0.2091 0.8 4.7 GX 1+4 264.7248 -44.3004 5.5 8.9 102.9 0.5173 2.1 9.0 4U 1735-44 268.3009 -1.5401 28.6 44.6 28.4 0.2251 0.4 6.6 SW J1753.5-0127 270.3034 -25.0564 3.0 23.8 49.2 1.1185 3.9 1.7 GX 5-1 270.3960 -25.7240 2.6 23.3 50.3 1.2548 4.5 5.2 GRS 1758-258 273.8270 -13.9707 15.8 35.0 43.6 0.3147 0.7 11.1 GX 17+2 276.0790 -30.4707 4.6 23.0 67.9 0.7356 2.5 10.1 H1820-303 284.8325 -24.8842 4.3 32.5 70.5 1.2079 2.7 11.3 HT1900.1-2455 263.0478 -33.8921 5.8 12.9 48.9 0.4844 2.0 4.5 GX 354-0 349.7626 -83.4864 3.3 47.4 176.6 1.8975 3.5 ------ UNKNOWN 247.6809 8.2239 2.8 52.2 -0.5 2.7189 4.1 ------ UNKNOWN 107.9753 -76.5472 3.4 57.6 -165.4 4.6410 3.4 ------ UNKNOWN 102.9138 -75.5855 4.0 59.0 -166.2 5.9660 2.9 ------ UNKNOWN 161.3583 -75.2752 2.7 48.2 -154.7 2.2935 4.3 ------ UNKNOWN 209.3836 -18.8978 3.4 43.6 -63.8 4.8715 3.4 ------ UNKNOWN 196.6573 -39.3894 5.3 41.1 -98.4 3.1155 2.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.032000 1.020000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2637 -60.8025 12.0 49.3 -135.0 -0.0677 -1.0 10.9 Cen X-3 186.6800 -62.7414 145.2 41.3 -135.4 -0.0023 -0.1 1.8 GX 301-2 244.8798 -15.5639 20.0 28.9 -9.7 0.0095 0.6 7.4 Sco X-1 255.9235 -38.0017 3.9 6.4 31.5 0.0395 2.9 9.9 4U 1700-377 256.6103 -36.3570 5.3 8.1 30.4 0.0285 2.2 9.3 GX 349+2 262.8547 -24.6202 6.5 21.0 32.9 0.0297 1.8 11.3 GX 1+4 264.9573 -44.4446 5.8 9.1 103.9 0.0285 2.0 9.2 4U 1735-44 268.3286 -1.4112 7.1 44.7 28.4 0.0568 1.6 3.4 SW J1753.5-0127 270.1214 -25.0938 4.4 23.6 48.9 -0.0465 -2.6 8.9 GX 5-1 270.1368 -25.7533 50.3 23.1 49.8 -0.0041 -0.2 9.0 GRS 1758-258 273.9839 -14.1804 6.7 34.9 44.0 0.0415 1.7 8.7 GX 17+2 275.7343 -30.3060 23.0 22.9 67.1 0.0093 0.5 10.5 H1820-303 284.8496 -24.9144 7.1 32.5 70.5 0.0423 1.6 10.2 HT1900.1-2455 262.8530 -34.0080 0.0 12.7 48.6 -0.0176 -1.2 12.4 GX 354-0 100.5768 -78.3103 2.5 56.7 -168.1 0.2836 4.5 ------ UNKNOWN 221.0334 -25.6133 0.6 31.2 -59.4 0.4805 20.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 70.332580 962.062200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3222 -60.6243 19.9 48.9 -170.9 1.0252 0.6 0.2 Cen X-3 186.6809 -62.7695 0.8 43.5 -179.1 18.5644 15.1 0.7 GX 301-2 244.9800 -15.6412 0.3 24.5 49.4 32.1138 35.8 0.1 Sco X-1 256.1861 -37.7174 0.0 32.0 99.7 -3.8645 -2.5 12.1 4U 1700-377 256.3719 -36.3709 7.5 31.9 97.1 2.4089 1.5 4.4 GX 349+2 262.8456 -24.8513 0.0 37.6 77.0 1.5317 0.6 10.9 GX 1+4 264.9026 -44.3085 4.5 39.9 108.2 -7.3136 -2.6 10.9 4U 1735-44 263.0781 -33.9215 5.1 37.1 91.9 -5.1869 -2.2 6.8 GX 354-0 258.0014 -3.6208 2.9 41.7 43.2 7.6463 4.0 ------ UNKNOWN 228.2692 -51.0280 2.8 26.0 148.5 3.2226 4.1 ------ UNKNOWN 233.7671 28.1482 2.9 55.2 -7.4 9.5243 3.9 ------ UNKNOWN 220.3841 11.3063 3.0 37.0 -22.2 3.6468 3.9 ------ UNKNOWN 155.7368 -41.4104 4.9 55.3 -145.2 13.0297 2.4 ------ UNKNOWN 201.6964 21.3655 4.4 50.6 -44.6 11.3844 2.6 ------ UNKNOWN 166.5321 -29.7877 3.0 48.0 -129.1 14.5868 3.9 ------ UNKNOWN 170.6257 -24.6911 3.9 45.4 -121.3 11.1317 2.9 ------ UNKNOWN 196.8351 14.9093 3.5 46.9 -54.0 13.5341 3.3 ------ UNKNOWN