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: Mon Jan 13 05:22:42 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger518507
======================================================================
Trigger: 00518507 Segment: 000
BAT Trigger Time: 354261559.36 [s; MET]
Trigger Stop: 354261560.384 [s; MET]
UTC: 2012-03-24T05:59:11.334480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.084059291849 Dec: 24.1452774141341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.05
Image Trigger?: NO
Rate S/N Ratio: 89.9388681271896 [ if not an image trigger ]
Image S/N Ratio: 19.05
Analysis Position: [ source = BAT ]
RA: 291.084059291849 Dec: 24.1452774141341 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 291.080478623267 Dec: 24.1397177760819 [deg; J2000]
{ 19h 24m 19.3s , +24d 08' 23.0" }
+/- 1.09968692335447 [arcmin] (estimated 90% radius based on SNR)
+/- 0.445113850140597 [arcmin] (formal 1-sigma fit error)
SNR: 26.5559950405019
Angular difference between the analysis and refined position is 0.386923 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 118.423999965191 +/- 10.0100150231936
Measured from: -42.1680000424385
to: 76.2559999227524 [s; relative to TRIGTIME]
T50: 30.8319999575615 +/- 0.719510923285473
Measured from: 3.91200000047684
to: 34.7439999580383 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.6759999990463
to: 34.6759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -150.512000024319
to: 142.455999970436 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.707915 5.340255 4.723777 1.480314
0.105615 0.102871 0.088676 0.073665 [error]
Peak 0.144101 0.248482 0.258281 0.076070
0.007649 0.008728 0.008697 0.006033 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 292.968 -150.512 142.456
T90 118.424 -42.168 76.256
T50 30.832 3.912 34.744
Peak 1.000 33.676 34.676
====== 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 -1.312 -0.045 0.045 - - - 3.48e-03 -8.06e-05 8.05e-05 43.020 57
CPL -1.308 -0.045 0.086 9998.450 -9998.450 -9998.450 3.49e-03 -7.82e-05 4.13e-04 43.080 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 -1.126 -0.067 0.067 - - - 4.94e-02 -1.85e-03 1.85e-03 56.780 57
CPL -1.000 -0.156 0.263 457.640 -457.640 -457.640 5.62e-02 -8.12e-03 1.67e-02 56.040 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 1.09e-06 2.25e-06 3.62e-06 1.31e-05 1.00e-05 2.00e-05 erg/cm2
90%_error_low -5.58e-08 -6.66e-08 -9.33e-08 -8.00e-07 -2.35e-07 -8.31e-07 erg/cm2
90%_error_hi 5.70e-08 6.64e-08 9.30e-08 8.38e-07 2.36e-07 8.62e-07 erg/cm2
Peak flux PL 1.42e+00 1.79e+00 1.64e+00 2.62e+00 5.75e+00 7.48e+00 ph/cm2/s
90%_error_low -1.08e-01 -8.28e-02 -6.93e-02 -2.35e-01 -2.23e-01 -2.98e-01 ph/cm2/s
90%_error_hi 1.11e-01 8.24e-02 6.90e-02 2.49e-01 2.23e-01 3.01e-01 ph/cm2/s
Fluence CPL 1.10e-06 2.24e-06 3.60e-06 1.30e-05 1.01e-05 2.08e-05 erg/cm2
90%_error_low N/A -6.26e-08 N/A N/A N/A -2.81e-06 erg/cm2
90%_error_hi N/A 7.04e-08 N/A N/A N/A -4.62e-07 erg/cm2
Peak flux CPL 9.53e-01 7.16e-01 3.76e-01 3.42e-01 2.18e+00 2.39e+00 ph/cm2/s
90%_error_low -1.11e-01 -1.04e-01 -3.09e-02 -5.09e-02 -2.93e-01 -2.45e-01 ph/cm2/s
90%_error_hi 1.27e-01 6.59e-02 1.92e-02 4.41e-02 1.83e-01 1.50e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 291.0805 24.1397 0.0072 30.9195 -160.9503 6.3875123 26.556 TRIG_00518507 Foreground time interval of the image: -150.512 12.941 (delta_t = 163.453 [sec]) Background time interval of the image: -239.360 -150.512 (delta_t = 88.848 [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 -150.512 sec. to 142.456 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.31194 ( -0.0447148 0.0448914 ) Norm@50keV : 3.47520E-03 ( -8.06226e-05 8.04914e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.02 using 59 PHA bins. # Reduced chi-squared = 0.7548 for 57 degrees of freedom # Null hypothesis probability = 9.147888e-01 Photon flux (15-150 keV) in 293 sec: 0.415531 ( -0.010879 0.01094 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00341e-05 ( -2.35397e-07 2.35855e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -150.512 sec. to 142.456 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30831 ( -0.0446366 0.0860053 ) Epeak [keV] : 9998.45 ( -9998.73 -9998.73 ) Norm@50keV : 3.48777E-03 ( -7.98153e-05 0.000411127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.08 using 59 PHA bins. # Reduced chi-squared = 0.7692 for 56 degrees of freedom # Null hypothesis probability = 8.972202e-01 Photon flux (15-150 keV) in 293 sec: 0.417582 ( -0.012861 0.00851 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00683e-05 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 33.676 sec. to 34.676 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.12602 ( -0.0672086 0.0674519 ) Norm@50keV : 4.94254E-02 ( -0.00185366 0.00185263 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.78 using 59 PHA bins. # Reduced chi-squared = 0.9961 for 57 degrees of freedom # Null hypothesis probability = 4.834575e-01 Photon flux (15-150 keV) in 1 sec: 5.74834 ( -0.22313 0.22337 ) ph/cm2/s Energy fluence (15-150 keV) : 5.12602e-07 ( -2.10834e-08 2.11383e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.676 sec. to 34.676 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.999772 ( -0.15649 0.262716 ) Epeak [keV] : 457.640 ( -457.64 -457.64 ) Norm@50keV : 5.62436E-02 ( -0.00812457 0.0167264 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.04 using 59 PHA bins. # Reduced chi-squared = 1.001 for 56 degrees of freedom # Null hypothesis probability = 4.733915e-01 Photon flux (15-150 keV) in 1 sec: 2.18282 ( -0.29288 0.18276 ) ph/cm2/s Energy fluence (15-150 keV) : 5.09753e-07 ( -2.19775e-08 2.19021e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 118.424 sec. Hardness ratio (energy fluence ratio) = 1.61116524912
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.338748e-06 S(50-150 keV) = 6.69546e-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 = -5.661482109179601E-01, IMY = 1.954902831321166E-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: -239.360000 -150.512000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9733 -15.6184 0.9 36.3 70.0 3.4218 12.4 1.4 Sco X-1 254.3234 35.4573 0.0 47.2 150.6 0.5794 1.6 9.5 Her X-1 256.1182 -38.0210 23.8 39.7 30.1 0.0945 0.5 12.3 4U 1700-377 256.2779 -36.4100 5.7 38.4 31.6 0.3799 2.0 7.6 GX 349+2 263.1635 -24.7624 8.8 25.8 37.8 0.1597 1.3 8.5 GX 1+4 264.9033 -44.4757 5.9 41.8 16.3 0.3617 2.0 7.0 4U 1735-44 268.4627 -1.4531 4.5 12.4 105.8 0.2727 2.6 5.7 SW J1753.5-0127 270.2334 -25.0068 3.8 22.3 24.5 0.3346 3.0 5.1 GX 5-1 270.1618 -25.6756 3.4 22.9 23.9 0.3928 3.4 8.6 GRS 1758-258 274.0426 -14.0174 3.5 11.0 33.7 0.3182 3.4 2.4 GX 17+2 275.9253 -30.3702 90.0 25.8 8.5 0.0145 0.1 0.2 H1820-303 284.8809 -25.0743 0.0 20.6 -12.0 -0.1887 -1.7 12.5 HT1900.1-2455 288.7706 10.9576 1.0 18.0 -152.5 1.1705 11.6 1.8 GRS 1915+105 299.5331 35.2441 2.6 44.1 -157.6 0.8478 4.5 3.8 Cyg X-1 308.1080 40.8990 7.9 52.4 -153.9 0.4761 1.5 3.2 Cyg X-3 263.1397 -34.0047 0.0 33.1 26.4 0.0029 0.0 12.7 GX 354-0 240.8236 2.2938 2.3 40.1 99.2 2.1314 4.9 ------ UNKNOWN 248.2148 23.6080 2.5 42.4 133.4 1.5431 4.7 ------ UNKNOWN 295.9528 -57.8077 3.0 54.2 -10.4 1.1886 3.9 ------ UNKNOWN 321.7934 -17.9108 3.1 42.5 -69.0 1.7788 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -150.512000 12.940600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0206 -15.6965 14.9 36.3 69.8 -0.4624 -0.8 4.1 Sco X-1 254.4777 35.3453 40.1 47.1 150.6 0.2060 0.3 1.0 Her X-1 256.1394 -37.9401 29.4 39.7 30.2 -0.1664 -0.4 9.2 4U 1700-377 256.2826 -36.3302 28.7 38.4 31.7 -0.1664 -0.4 9.2 GX 349+2 262.9707 -24.7986 15.5 25.9 38.0 -0.1925 -0.7 3.8 GX 1+4 264.8994 -44.5510 5.2 41.8 16.3 -0.9090 -2.2 9.0 4U 1735-44 268.2725 -1.5874 7.0 12.5 104.9 -0.4070 -1.7 9.9 SW J1753.5-0127 270.2103 -25.2069 5.0 22.5 24.3 0.5450 2.3 8.7 GX 5-1 270.4553 -25.8328 11.6 22.9 23.1 0.2393 1.0 9.9 GRS 1758-258 274.0738 -14.0665 5.0 11.0 33.4 -0.4660 -2.3 4.4 GX 17+2 275.8618 -30.3752 6.3 25.8 8.6 0.4313 1.8 3.3 H1820-303 284.8807 -25.0088 13.1 20.5 -12.1 0.1908 0.9 10.0 HT1900.1-2455 288.9454 10.9301 4.6 18.0 -152.0 0.5219 2.5 8.7 GRS 1915+105 299.4676 35.3569 21.0 44.1 -157.7 -0.2046 -0.5 11.1 Cyg X-1 308.2552 40.8744 10.9 52.5 -153.8 0.6997 1.1 8.1 Cyg X-3 262.9261 -33.8948 6.2 33.2 26.7 0.5879 1.9 4.8 GX 354-0 268.6866 10.5636 2.7 19.4 143.0 0.9835 4.3 ------ UNKNOWN 291.0805 24.1397 0.4 30.9 -161.0 6.3873 26.6 ------ UNKNOWN 294.7805 22.0183 2.9 30.5 -153.1 1.0227 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 64.140600 962.708300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2574 35.4271 0.0 33.7 112.6 2.7306 2.5 11.0 Her X-1 268.4002 -1.5016 2.3 33.8 38.3 3.7103 5.0 3.5 SW J1753.5-0127 270.3718 -25.0095 11.9 53.1 18.0 -2.2767 -1.0 6.3 GX 5-1 270.3762 -25.8753 7.8 53.9 17.6 -3.7970 -1.5 8.9 GRS 1758-258 274.1268 -14.0453 9.2 41.6 19.6 1.0660 1.3 7.1 GX 17+2 284.9972 -24.9469 6.3 49.4 1.7 2.0887 1.8 2.6 HT1900.1-2455 288.7989 10.9507 0.4 13.4 4.1 13.1608 27.6 0.3 GRS 1915+105 299.5883 35.1856 0.8 13.3 -153.8 7.6623 15.0 1.0 Cyg X-1 308.0594 40.9752 0.9 22.0 -149.5 6.8604 12.6 2.7 Cyg X-3 326.2855 38.2882 4.4 33.0 -129.4 2.1225 2.6 5.7 Cyg X-2 294.0893 67.2733 3.9 43.2 176.1 2.4329 3.0 ------ UNKNOWN 339.6305 35.5755 3.2 43.2 -122.6 6.8748 3.7 ------ UNKNOWN 350.2008 47.9459 4.3 51.9 -138.6 8.7541 2.7 ------ UNKNOWN 321.5707 -16.9112 3.8 50.7 -44.5 9.1874 3.1 ------ UNKNOWN 345.4847 40.2226 2.6 48.0 -128.9 10.8574 4.4 ------ UNKNOWN