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 Apr 25 16:26:13 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger744791
======================================================================
Trigger: 00744791 Segment: 000
BAT Trigger Time: 512617265.28 [s; MET]
Trigger Stop: 512617273.472 [s; MET]
UTC: 2017-03-31T01:40:46.444640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.782196657932 Dec: -24.413770984427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.93
Image Trigger?: NO
Rate S/N Ratio: 9.4339811320566 [ if not an image trigger ]
Image S/N Ratio: 7.93
Analysis Position: [ source = BAT ]
RA: 323.782196657932 Dec: -24.413770984427 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 323.77794176101 Dec: -24.4054251923295 [deg; J2000]
{ 21h 35m 06.7s , -24d 24' 19.5" }
+/- 2.01901709458333 [arcmin] (estimated 90% radius based on SNR)
+/- 0.868021849924879 [arcmin] (formal 1-sigma fit error)
SNR: 11.1481832769637
Angular difference between the analysis and refined position is 0.552080 arcmin
Partial Coding Fraction: 0.1855469 [ including projection effects ]
Duration
T90: 17.6160000562668 +/- 2.47690129067317
Measured from: -1.72799998521805
to: 15.8880000710487 [s; relative to TRIGTIME]
T50: 9.60000002384186 +/- 2.44361699787484
Measured from: 1.44000005722046
to: 11.0400000810623 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.420000016689301
to: 1.4200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.783999979496
to: 17.1520000100136 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.520557 0.814011 0.374668 0.060832
0.075245 0.077393 0.064755 0.053952 [error]
Peak 0.038653 0.063699 0.044627 0.023698
0.016554 0.017425 0.014898 0.013122 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 19.936 -2.784 17.152
T90 17.616 -1.728 15.888
T50 9.600 1.440 11.040
Peak 1.000 0.420 1.420
====== 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 -1.869 -0.211 0.202 - - - 5.85e-03 -8.13e-04 8.00e-04 68.890 57
CPL -0.356 -1.043 1.355 47.957 -8.329 16.374 4.02e-02 -4.02e-02 1.86e-01 62.200 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 -1.725 -0.513 0.502 - - - 9.32e-03 -3.14e-03 3.10e-03 68.910 57
CPL 1.244 -2.771 6.374 50.275 -12.819 59.611 3.54e-01 -3.54e-01 2.26e+02 65.640 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 2.11e-07 3.10e-07 3.39e-07 6.97e-07 1.07e-06 1.56e-06 erg/cm2
90%_error_low -3.68e-08 -3.78e-08 -6.16e-08 -2.23e-07 -1.47e-07 -2.96e-07 erg/cm2
90%_error_hi 3.81e-08 3.77e-08 6.21e-08 2.81e-07 1.49e-07 3.38e-07 erg/cm2
Peak flux PL 4.76e-01 4.20e-01 2.54e-01 2.32e-01 1.25e+00 1.38e+00 ph/cm2/s
90%_error_low -2.23e-01 -1.44e-01 -1.01e-01 -1.38e-01 -4.19e-01 -4.48e-01 ph/cm2/s
90%_error_hi 2.51e-01 1.42e-01 1.01e-01 2.16e-01 4.22e-01 4.48e-01 ph/cm2/s
Fluence CPL 1.78e-07 3.66e-07 3.36e-07 1.11e-07 9.67e-07 9.91e-07 erg/cm2
90%_error_low -4.41e-08 -5.39e-08 -7.94e-08 -8.03e-08 -1.50e-07 -1.70e-07 erg/cm2
90%_error_hi 4.45e-08 5.63e-08 7.51e-08 2.41e-07 1.60e-07 2.70e-07 erg/cm2
Peak flux CPL 2.94e-01 5.56e-01 2.83e-01 2.17e-02 1.15e+00 1.15e+00 ph/cm2/s
90%_error_low -2.51e-01 -1.96e-01 -1.41e-01 -2.17e-02 -4.36e-01 -4.37e-01 ph/cm2/s
90%_error_hi 3.05e-01 2.05e-01 1.40e-01 1.70e-01 4.36e-01 4.41e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 323.7779 -24.4054 0.0174 39.6492 -62.7566 1.7659817 11.148 TRIG_00744791 Foreground time interval of the image: -2.784 17.152 (delta_t = 19.936 [sec]) Background time interval of the image: -239.280 -2.784 (delta_t = 236.496 [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 -2.784 sec. to 17.152 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.86877 ( -0.210921 0.201759 ) Norm@50keV : 5.85021E-03 ( -0.000813261 0.000799855 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.89 using 59 PHA bins. # Reduced chi-squared = 1.209 for 57 degrees of freedom # Null hypothesis probability = 1.344039e-01 Photon flux (15-150 keV) in 19.94 sec: 0.828698 ( -0.102284 0.102405 ) ph/cm2/s Energy fluence (15-150 keV) : 1.07262e-06 ( -1.47164e-07 1.49111e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.784 sec. to 17.152 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.355513 ( -1.04264 1.35509 ) Epeak [keV] : 47.9571 ( -8.32925 16.3744 ) Norm@50keV : 4.01682E-02 ( -0.0401692 0.186362 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.20 using 59 PHA bins. # Reduced chi-squared = 1.111 for 56 degrees of freedom # Null hypothesis probability = 2.649671e-01 Photon flux (15-150 keV) in 19.94 sec: 0.789239 ( -0.105778 0.105911 ) ph/cm2/s Energy fluence (15-150 keV) : 9.66619e-07 ( -1.49764e-07 1.60384e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.420 sec. to 1.420 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72458 ( -0.514016 0.50131 ) Norm@50keV : 9.32168E-03 ( -0.00313968 0.00310209 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.91 using 59 PHA bins. # Reduced chi-squared = 1.209 for 57 degrees of freedom # Null hypothesis probability = 1.339954e-01 Photon flux (15-150 keV) in 1 sec: 1.24879 ( -0.418702 0.42231 ) ph/cm2/s Energy fluence (15-150 keV) : 8.61747e-08 ( -2.93339e-08 2.97698e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.420 sec. to 1.420 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.24437 ( -2.94186 6.20315 ) Epeak [keV] : 50.2748 ( -12.5389 59.8914 ) Norm@50keV : 0.354045 ( -0.466591 225.446 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.64 using 59 PHA bins. # Reduced chi-squared = 1.172 for 56 degrees of freedom # Null hypothesis probability = 1.773120e-01 Photon flux (15-150 keV) in 1 sec: 1.15371 ( -0.435607 0.43604 ) ph/cm2/s Energy fluence (15-150 keV) : 7.51623e-08 ( -2.57085e-08 2.93097e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 17.616 sec. Hardness ratio (energy fluence ratio) = 1.09534187583
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.20384e-07 S(50-150 keV) = 5.522379e-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 = 3.793650527095629E-01, IMY = 7.367904562794484E-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: -239.280000 -2.784000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9453 -15.5901 1.4 37.2 86.9 7.2556 8.5 3.6 Sco X-1 255.9994 -37.8163 2.6 34.4 45.0 2.0584 4.4 1.8 4U 1700-377 256.3684 -36.4808 5.6 33.4 46.6 0.9202 2.1 4.7 GX 349+2 262.9789 -24.7072 4.2 22.2 61.6 0.8574 2.8 2.8 GX 1+4 264.8119 -44.6037 7.3 34.9 28.3 0.6256 1.6 9.7 4U 1735-44 268.2183 -1.3215 6.7 19.2 132.9 -0.5134 -1.7 11.9 SW J1753.5-0127 270.3586 -25.0275 2.7 16.8 49.7 1.2083 4.2 5.1 GX 5-1 270.1337 -25.5950 0.0 17.4 48.7 0.7499 2.6 12.7 GRS 1758-258 273.9995 -14.0743 3.3 9.1 90.0 0.9031 3.5 2.3 GX 17+2 275.9186 -30.2912 23.8 18.2 26.0 -0.1360 -0.5 4.6 H1820-303 285.0794 -24.8352 74.2 11.5 -2.9 0.0464 0.2 5.6 HT1900.1-2455 288.7600 10.8935 1.6 24.9 -162.2 2.1128 7.2 3.9 GRS 1915+105 299.5922 35.1936 1.3 51.0 -157.8 7.3841 8.8 0.5 Cyg X-1 263.0886 -33.9159 5.6 27.5 43.5 0.7024 2.1 7.0 GX 354-0 259.9017 -25.0173 0.8 24.9 63.9 4.9948 15.1 ------ UNKNOWN 290.7376 39.9920 2.6 53.9 -167.9 4.3290 4.4 ------ UNKNOWN 325.4784 -46.5195 3.1 48.3 -33.1 2.3326 3.7 ------ UNKNOWN 329.3296 -38.6308 4.8 47.7 -44.4 2.9189 2.4 ------ UNKNOWN 324.7343 -15.5586 3.1 40.1 -76.6 4.6211 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.784000 17.152000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8201 -15.6816 8.6 37.3 86.7 -0.2580 -1.4 9.5 Sco X-1 255.8404 -37.9589 5.6 34.6 44.9 0.2170 2.1 9.8 4U 1700-377 256.5183 -36.4292 7.1 33.2 46.5 0.1632 1.6 4.0 GX 349+2 263.1719 -24.8843 7.5 22.2 61.0 0.1103 1.5 12.2 GX 1+4 264.8229 -44.5278 5.4 34.9 28.4 -0.1784 -2.1 5.8 4U 1735-44 268.5161 -1.5169 8.7 18.9 133.0 -0.0835 -1.3 9.7 SW J1753.5-0127 270.2094 -25.2138 10.8 17.1 49.5 -0.0647 -1.1 9.0 GX 5-1 270.4676 -25.7919 6.0 17.3 47.5 0.1221 2.0 9.4 GRS 1758-258 274.1567 -13.9611 8.4 8.9 90.6 0.0822 1.4 9.9 GX 17+2 275.7684 -30.5181 0.0 18.4 26.0 0.0631 1.0 12.2 H1820-303 284.9563 -25.0300 5.9 11.7 -2.3 0.1108 1.9 7.9 HT1900.1-2455 288.9250 10.8502 5.4 24.9 -161.8 -0.1286 -2.2 9.4 GRS 1915+105 299.5694 35.2017 4.1 51.0 -157.8 0.4749 2.8 1.0 Cyg X-1 263.1595 -33.8853 3.7 27.4 43.5 -0.2290 -3.1 9.0 GX 354-0 294.5601 -28.1171 1.9 18.0 -28.7 0.3375 6.0 ------ UNKNOWN 323.7779 -24.4054 1.0 39.6 -62.8 1.7657 11.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 108.220600 962.854800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.1984 -24.9076 5.6 34.9 107.4 -2.6856 -2.1 8.9 HT1900.1-2455 288.7431 10.9437 4.3 49.2 158.3 5.4093 2.7 3.3 GRS 1915+105 26.3386 -58.6555 3.5 55.2 -7.8 5.8767 3.3 ------ UNKNOWN 11.9362 -19.3067 3.7 44.8 -60.2 10.6092 3.1 ------ UNKNOWN