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 May 17 01:39:14 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger639278
======================================================================
Trigger: 00639278 Segment: 000
BAT Trigger Time: 451883537.024 [s; MET]
Trigger Stop: 451883539.072 [s; MET]
UTC: 2015-04-28T03:12:03.518520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 292.654499855063 Dec: 4.11579888955815 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 7.45
Analysis Position: [ source = BAT ]
RA: 292.654499855063 Dec: 4.11579888955815 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 292.662067235886 Dec: 4.11398149747663 [deg; J2000]
{ 19h 30m 38.9s , +04d 06' 50.3" }
+/- 1.30434080093989 [arcmin] (estimated 90% radius based on SNR)
+/- 0.542734138432509 [arcmin] (formal 1-sigma fit error)
SNR: 20.810091058089
Angular difference between the analysis and refined position is 0.465815 arcmin
Partial Coding Fraction: 0.4023438 [ including projection effects ]
Duration
T90: 130.947999954224 +/- 15.5505195049043
Measured from: -34.4679999947548
to: 96.4799999594688 [s; relative to TRIGTIME]
T50: 65.3439999222755 +/- 4.03605998704794
Measured from: 0.948000013828278
to: 66.2919999361038 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.36000001430511
to: 2.36000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.0600000023842
to: 121.744000017643 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.863345 2.553690 1.550793 0.318924
0.129963 0.118215 0.096920 0.078396 [error]
Peak 0.029061 0.073378 0.054437 0.019138
0.012712 0.012299 0.010221 0.007633 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 161.804 -40.060 121.744
T90 130.948 -34.468 96.480
T50 65.344 0.948 66.292
Peak 1.000 1.360 2.360
====== 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: 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 -1.808 -0.099 0.098 - - - 2.56e-03 -1.51e-04 1.51e-04 48.990 57
CPL -0.965 -0.440 0.492 58.295 -7.751 15.447 7.03e-03 -2.84e-03 5.55e-03 37.310 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 -1.393 -0.314 0.321 - - - 1.23e-02 -2.42e-03 2.41e-03 55.760 57
CPL -0.120 -1.304 1.830 81.244 -23.839 3168.746 4.76e-02 -4.76e-02 2.81e-01 52.990 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 7.06e-07 1.08e-06 1.23e-06 2.68e-06 3.81e-06 5.69e-06 erg/cm2
90%_error_low -6.45e-08 -6.20e-08 -9.53e-08 -4.11e-07 -2.28e-07 -4.99e-07 erg/cm2
90%_error_hi 6.63e-08 6.19e-08 9.54e-08 4.57e-07 2.29e-07 5.32e-07 erg/cm2
Peak flux PL 4.57e-01 4.90e-01 3.73e-01 4.63e-01 1.50e+00 1.78e+00 ph/cm2/s
90%_error_low -1.57e-01 -1.15e-01 -8.10e-02 -1.75e-01 -3.16e-01 -3.49e-01 ph/cm2/s
90%_error_hi 1.78e-01 1.13e-01 8.00e-02 2.27e-01 3.20e-01 3.49e-01 ph/cm2/s
Fluence CPL 6.19e-07 1.17e-06 1.26e-06 8.92e-07 3.57e-06 3.93e-06 erg/cm2
90%_error_low -7.74e-08 -7.80e-08 -1.08e-07 -3.55e-07 -2.56e-07 -4.38e-07 erg/cm2
90%_error_hi 7.87e-08 7.96e-08 1.07e-07 6.18e-07 2.58e-07 6.51e-07 erg/cm2
Peak flux CPL 3.36e-01 5.27e-01 4.26e-01 1.79e-01 1.42e+00 1.47e+00 ph/cm2/s
90%_error_low -1.72e-01 -1.34e-01 -9.96e-02 -1.79e-01 -3.20e-01 -3.51e-01 ph/cm2/s
90%_error_hi 2.09e-01 1.38e-01 1.03e-01 3.16e-01 3.28e-01 4.20e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 292.6621 4.1140 0.0093 43.5554 -154.6046 4.1803718 20.810 TRIG_00639278 Foreground time interval of the image: -40.060 29.477 (delta_t = 69.537 [sec]) Background time interval of the image: -239.024 -40.060 (delta_t = 198.964 [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 -40.060 sec. to 121.744 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.80811 ( -0.0992844 0.0981782 ) Norm@50keV : 2.55804E-03 ( -0.000151299 0.000150608 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.99 using 59 PHA bins. # Reduced chi-squared = 0.8596 for 57 degrees of freedom # Null hypothesis probability = 7.657109e-01 Photon flux (15-150 keV) in 161.8 sec: 0.353625 ( -0.020871 0.020929 ) ph/cm2/s Energy fluence (15-150 keV) : 3.80986e-06 ( -2.28245e-07 2.29373e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.060 sec. to 121.744 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.964588 ( -0.440441 0.491702 ) Epeak [keV] : 58.2952 ( -7.75111 15.4471 ) Norm@50keV : 7.03194E-03 ( -0.0028418 0.00554517 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.31 using 59 PHA bins. # Reduced chi-squared = 0.6662 for 56 degrees of freedom # Null hypothesis probability = 9.743002e-01 Photon flux (15-150 keV) in 161.8 sec: 0.338144 ( -0.022232 0.02228 ) ph/cm2/s Energy fluence (15-150 keV) : 3.57033e-06 ( -2.56205e-07 2.58348e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.360 sec. to 2.360 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3934 ( -0.31433 0.321422 ) Norm@50keV : 1.22969E-02 ( -0.00242018 0.00241424 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.76 using 59 PHA bins. # Reduced chi-squared = 0.9782 for 57 degrees of freedom # Null hypothesis probability = 5.217965e-01 Photon flux (15-150 keV) in 1 sec: 1.49534 ( -0.31596 0.3203 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18995e-07 ( -2.40439e-08 2.41348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.360 sec. to 2.360 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.120369 ( -1.30392 1.83043 ) Epeak [keV] : 81.2439 ( -23.8389 3168.75 ) Norm@50keV : 4.75519E-02 ( -0.0475526 0.281229 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.99 using 59 PHA bins. # Reduced chi-squared = 0.9463 for 56 degrees of freedom # Null hypothesis probability = 5.894798e-01 Photon flux (15-150 keV) in 1 sec: 1.41528 ( -0.31954 0.32832 ) ph/cm2/s Energy fluence (15-150 keV) : 1.13105e-07 ( -2.54453e-08 2.52931e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 130.948 sec. Hardness ratio (energy fluence ratio) = 1.07810250831
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7853715e-06 S(50-150 keV) = 1.7849365e-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 = -8.589281366023965E-01, IMY = 4.077643457333014E-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: -239.024000 -40.060000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9869 -15.6329 0.3 23.4 107.5 13.0598 40.1 0.6 Sco X-1 255.9917 -37.7952 2.5 10.4 25.0 1.1162 4.6 2.9 4U 1700-377 256.4968 -36.2818 5.1 9.1 30.3 0.5497 2.3 9.0 GX 349+2 262.9154 -24.6565 6.5 6.0 145.9 0.4309 1.8 7.4 GX 1+4 264.7059 -44.4174 21.5 14.0 -16.8 0.1219 0.5 2.5 4U 1735-44 268.4588 -1.5575 3.2 29.0 170.4 -1.0027 -3.6 8.3 SW J1753.5-0127 270.2784 -25.0855 1.9 7.2 -153.4 1.3110 6.0 0.5 GX 5-1 270.3315 -25.8849 3.7 6.6 -148.5 0.6703 3.2 8.7 GRS 1758-258 273.8826 -14.0083 2.9 18.4 -168.1 0.9594 4.0 7.4 GX 17+2 275.8645 -30.3427 4.5 9.5 -104.5 0.6215 2.6 3.5 H1820-303 284.9300 -24.7593 8.0 18.7 -119.7 0.3635 1.4 11.3 HT1900.1-2455 288.7896 10.9902 1.9 47.3 -164.3 3.1375 6.1 2.7 GRS 1915+105 263.1825 -33.8249 2.8 3.7 4.4 0.9484 4.0 9.7 GX 354-0 196.2693 -53.7559 2.6 53.5 26.0 5.6288 4.5 ------ UNKNOWN 227.0527 -33.9812 2.7 32.0 56.3 1.6543 4.3 ------ UNKNOWN 279.0921 -75.9508 3.5 46.1 -21.9 1.3665 3.3 ------ UNKNOWN 299.7600 16.6969 3.9 57.8 -156.7 5.2576 3.0 ------ UNKNOWN 312.7452 -30.9809 2.8 40.9 -93.6 5.2329 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -40.060000 29.476600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1040 -15.7337 5.3 23.2 107.5 0.3394 2.2 9.1 Sco X-1 256.0048 -37.8718 8.4 10.5 24.7 -0.1612 -1.4 1.9 4U 1700-377 256.2896 -36.5278 3.5 9.4 29.7 0.4045 3.3 9.4 GX 349+2 262.9578 -24.5733 5.8 6.0 146.5 -0.2198 -2.0 10.7 GX 1+4 264.7998 -44.5547 89.1 14.2 -17.1 0.0154 0.1 6.7 4U 1735-44 268.3164 -1.4973 4.4 29.1 170.1 0.3604 2.6 4.1 SW J1753.5-0127 270.1962 -24.9842 6.2 7.2 -154.4 -0.2006 -1.9 7.4 GX 5-1 270.4993 -25.6348 3.3 6.9 -149.1 0.3801 3.6 12.5 GRS 1758-258 273.8981 -13.8554 0.0 18.5 -168.3 0.1365 1.2 12.5 GX 17+2 275.8938 -30.2102 6.8 9.6 -105.3 -0.1947 -1.7 9.5 H1820-303 284.8608 -25.0066 2.5 18.5 -119.1 -0.5629 -4.6 10.8 HT1900.1-2455 288.8922 10.8039 3.8 47.2 -164.1 0.7138 3.0 10.1 GRS 1915+105 263.0155 -33.6841 24.0 3.7 7.2 0.0527 0.5 9.1 GX 354-0 222.5562 -31.0596 2.6 36.1 60.7 1.2420 4.5 ------ UNKNOWN 233.3586 -16.6165 2.5 31.8 91.3 0.9644 4.6 ------ UNKNOWN 197.8762 -59.0153 2.1 52.6 19.5 3.0511 5.4 ------ UNKNOWN 198.0371 -68.9618 2.3 53.6 7.1 2.1122 4.9 ------ UNKNOWN 292.6621 4.1140 0.6 43.6 -154.6 4.1799 20.8 ------ UNKNOWN 293.2387 -58.6631 2.1 34.3 -43.2 0.8694 5.5 ------ UNKNOWN 303.4782 -25.9569 2.6 34.2 -104.8 0.9131 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 95.876670 963.066000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5950 35.3281 5.7 47.0 152.0 4.1941 2.0 6.8 Her X-1 263.0601 -24.8682 5.5 40.8 58.7 4.0182 2.1 7.9 GX 1+4 268.3528 -1.5501 5.4 24.9 92.7 1.8300 2.2 5.9 SW J1753.5-0127 270.2047 -25.1111 3.2 36.5 51.0 4.4192 3.6 4.7 GX 5-1 270.2647 -25.8766 6.1 37.0 50.1 2.3213 1.9 8.3 GRS 1758-258 273.9934 -14.0657 1.9 25.9 60.6 4.9550 6.1 1.9 GX 17+2 275.7733 -30.3838 18.7 38.1 39.3 0.7205 0.6 7.9 H1820-303 284.8863 -24.9389 19.7 30.0 29.6 0.4304 0.6 8.2 HT1900.1-2455 288.7704 10.9288 0.7 7.8 166.3 10.3986 17.1 1.9 GRS 1915+105 299.5892 35.2026 0.3 31.7 -153.7 25.2905 33.2 0.1 Cyg X-1 308.0686 40.9977 2.1 39.4 -146.1 5.9052 5.6 3.3 Cyg X-3 326.3189 38.4300 0.0 46.0 -127.4 2.1734 0.6 9.5 Cyg X-2 277.3568 -23.7932 2.5 31.6 42.8 4.0094 4.7 ------ UNKNOWN 266.9074 20.3081 2.7 29.8 140.4 3.6974 4.3 ------ UNKNOWN 261.6930 49.2225 2.3 52.2 170.3 10.0334 4.9 ------ UNKNOWN 290.1034 -3.3755 2.4 7.9 34.1 2.6800 4.9 ------ UNKNOWN 307.5034 0.4943 2.7 15.3 -61.3 2.5023 4.2 ------ UNKNOWN 315.5469 -12.9513 3.7 28.4 -37.4 1.9524 3.1 ------ UNKNOWN 323.7427 -11.1717 2.9 34.5 -48.0 3.6743 3.9 ------ UNKNOWN 325.4218 43.8638 3.0 49.1 -133.5 11.9296 3.9 ------ UNKNOWN