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 Oct 31 19:11:58 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger778154
======================================================================
Trigger: 00778154 Segment: 000
BAT Trigger Time: 529439587.008 [s; MET]
Trigger Stop: 529439587.264 [s; MET]
UTC: 2017-10-11T18:32:47.183100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.760536734419 Dec: -10.0707462179219 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.59
Image Trigger?: NO
Rate S/N Ratio: 40.8656334834051 [ if not an image trigger ]
Image S/N Ratio: 14.59
Analysis Position: [ source = BAT ]
RA: 236.760536734419 Dec: -10.0707462179219 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 236.765532099342 Dec: -10.0633833249001 [deg; J2000]
{ 15h 47m 03.7s , -10d 03' 48.2" }
+/- 0.916726226939317 [arcmin] (estimated 90% radius based on SNR)
+/- 0.229852577546126 [arcmin] (formal 1-sigma fit error)
SNR: 34.4398878043931
Angular difference between the analysis and refined position is 0.531274 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 2.27999991178513 +/- 0.232997893409871
Measured from: 0.0600000023841858
to: 2.33999991416931 [s; relative to TRIGTIME]
T50: 1.15199995040894 +/- 0.0990353384814221
Measured from: 0.447999954223633
to: 1.59999990463257 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0479999780654907
to: 1.04799997806549 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 2.74399995803833 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.577664 0.693614 0.441827 0.118325
0.023005 0.025871 0.022787 0.023333 [error]
Peak 0.230739 0.317645 0.243691 0.074928
0.014177 0.016285 0.014750 0.014458 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 2.804 -0.060 2.744
T90 2.280 0.060 2.340
T50 1.152 0.448 1.600
Peak 1.000 0.048 1.048
====== 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 -1.691 -0.085 0.084 - - - 4.10e-02 -1.95e-03 1.94e-03 45.420 57
CPL -1.513 -0.244 0.352 128.870 N/A N/A 5.08e-02 N/A N/A 44.570 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 -1.441 -0.100 0.099 - - - 5.66e-02 -3.28e-03 3.27e-03 54.360 57
CPL -1.173 -0.314 0.413 150.964 N/A N/A 7.78e-02 N/A N/A 52.910 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 1.76e-07 2.87e-07 3.56e-07 8.72e-07 1.06e-06 1.69e-06 erg/cm2
90%_error_low -1.31e-08 -1.30e-08 -2.32e-08 -1.16e-07 -5.36e-08 -1.36e-07 erg/cm2
90%_error_hi 1.34e-08 1.29e-08 2.32e-08 1.28e-07 5.40e-08 1.45e-07 erg/cm2
Peak flux PL 2.20e+00 2.30e+00 1.69e+00 2.01e+00 6.96e+00 8.20e+00 ph/cm2/s
90%_error_low -2.13e-01 -1.38e-01 -1.24e-01 -2.89e-01 -3.94e-01 -4.76e-01 ph/cm2/s
90%_error_hi 2.19e-01 1.37e-01 1.24e-01 3.19e-01 3.95e-01 4.79e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -1.31e-08 -1.30e-08 -2.32e-08 -1.16e-07 -5.36e-08 -1.36e-07 erg/cm2
90%_error_hi 1.34e-08 1.29e-08 2.32e-08 1.28e-07 5.40e-08 1.45e-07 erg/cm2
Peak flux CPL 2.11e+00 2.36e+00 1.72e+00 1.43e+00 6.88e+00 7.62e+00 ph/cm2/s
90%_error_low -2.51e-01 -1.61e-01 -1.34e-01 -5.29e-01 -4.13e-01 -6.86e-01 ph/cm2/s
90%_error_hi 2.55e-01 1.66e-01 1.36e-01 6.85e-01 4.12e-01 8.51e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 236.7655 -10.0634 0.0056 22.0490 -79.6233 1.8734966 34.440 TRIG_00778154 Foreground time interval of the image: -0.060 2.744 (delta_t = 2.804 [sec]) Background time interval of the image: -59.507 -0.060 (delta_t = 59.447 [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 -0.060 sec. to 2.744 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69137 ( -0.0845395 0.0837002 ) Norm@50keV : 4.09619E-02 ( -0.00195253 0.00194134 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.42 using 59 PHA bins. # Reduced chi-squared = 0.7968 for 57 degrees of freedom # Null hypothesis probability = 8.653946e-01 Photon flux (15-150 keV) in 2.804 sec: 5.42411 ( -0.24583 0.24614 ) ph/cm2/s Energy fluence (15-150 keV) : 1.06433e-06 ( -5.35973e-08 5.3991e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 2.744 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51344 ( -0.244338 0.351947 ) Epeak [keV] : 128.870 ( ) Norm@50keV : 5.08058E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.57 using 59 PHA bins. # Reduced chi-squared = 0.7959 for 56 degrees of freedom # Null hypothesis probability = 8.642520e-01 Photon flux (15-150 keV) in 2.804 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.048 sec. to 1.048 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44114 ( -0.0999461 0.0994364 ) Norm@50keV : 5.66195E-02 ( -0.0032812 0.0032696 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.36 using 59 PHA bins. # Reduced chi-squared = 0.9537 for 57 degrees of freedom # Null hypothesis probability = 5.746744e-01 Photon flux (15-150 keV) in 1 sec: 6.96252 ( -0.39448 0.39469 ) ph/cm2/s Energy fluence (15-150 keV) : 5.42763e-07 ( -3.52233e-08 3.55194e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.048 sec. to 1.048 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17302 ( -0.314151 0.413183 ) Epeak [keV] : 150.964 ( ) Norm@50keV : 7.78413E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.91 using 59 PHA bins. # Reduced chi-squared = 0.9449 for 56 degrees of freedom # Null hypothesis probability = 5.924717e-01 Photon flux (15-150 keV) in 1 sec: 6.87687 ( -0.41272 0.4122 ) ph/cm2/s Energy fluence (15-150 keV) : 5.29468e-07 ( -4.01513e-08 4.00271e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 2.28 sec. Hardness ratio (energy fluence ratio) = 1.23856796177
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.626511e-07 S(50-150 keV) = 6.016899e-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 = 7.295171364331185E-02, IMY = 3.983962936016512E-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: -59.507410 -0.060000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0386 -15.6757 1.7 13.3 -94.7 2.6730 6.9 4.0 Sco X-1 254.3374 35.2688 8.3 50.4 -4.7 1.0633 1.4 7.4 Her X-1 256.0579 -37.8437 6.0 23.0 -174.4 -0.6746 -1.9 3.4 4U 1700-377 256.2845 -36.4037 4.8 21.5 -174.4 0.8434 2.4 7.4 GX 349+2 263.0815 -24.7679 16.4 10.6 158.4 0.2578 0.7 4.2 GX 1+4 264.7723 -44.3832 4.4 29.8 171.5 -1.1536 -2.6 4.2 4U 1735-44 268.5209 -1.5996 0.0 16.5 36.6 -0.1892 -0.5 12.7 SW J1753.5-0127 270.1453 -24.9563 6.9 14.6 135.0 0.6665 1.7 10.6 GX 5-1 270.1968 -25.7136 6.1 15.1 137.0 -0.7248 -1.9 6.0 GRS 1758-258 274.1703 -14.1686 6.4 14.9 88.9 -0.7065 -1.8 12.4 GX 17+2 276.0092 -30.2087 9.1 21.9 136.9 -0.5197 -1.3 10.5 H1820-303 285.0263 -25.0628 4.0 26.6 116.5 1.4411 2.9 8.6 HT1900.1-2455 288.9384 10.9540 14.3 39.6 50.8 0.6318 0.8 8.3 GRS 1915+105 262.9818 -33.8256 11.5 19.2 169.5 -0.3705 -1.0 0.7 GX 354-0 293.0654 16.9803 3.2 46.5 48.0 4.8927 3.7 ------ UNKNOWN 281.9052 -19.0827 2.3 22.5 103.9 2.1574 5.1 ------ UNKNOWN 274.8650 -70.9542 2.5 56.8 173.9 11.0463 4.6 ------ UNKNOWN 251.4024 -18.2747 4.6 7.8 -115.9 0.8495 2.5 ------ UNKNOWN 251.6392 15.4626 2.4 31.3 -13.3 1.8159 4.8 ------ UNKNOWN 248.4134 20.6469 2.5 37.1 -16.2 2.2237 4.6 ------ UNKNOWN 242.3556 -8.6121 2.8 17.3 -70.2 1.6706 4.1 ------ UNKNOWN UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.060000 2.744000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0992 -15.5318 5.4 13.2 -94.1 -0.0923 -2.1 9.5 Sco X-1 254.3407 35.3580 5.5 50.5 -4.6 0.2016 2.1 5.8 Her X-1 256.0851 -37.6964 7.0 22.8 -174.4 -0.0727 -1.7 10.0 4U 1700-377 256.6076 -36.5387 5.5 21.6 -175.2 -0.0882 -2.1 10.8 GX 349+2 263.0005 -24.6300 8.5 10.4 158.4 0.0604 1.4 7.0 GX 1+4 264.8820 -44.5385 7.5 30.0 171.4 -0.0842 -1.5 8.0 4U 1735-44 268.5073 -1.3041 0.0 16.7 36.0 0.0268 0.6 12.2 SW J1753.5-0127 270.4507 -25.1368 17.6 14.9 134.8 -0.0275 -0.7 9.7 GX 5-1 270.1360 -25.6946 6.2 15.1 137.1 -0.0811 -2.0 9.5 GRS 1758-258 274.1701 -14.1656 12.0 14.9 88.9 -0.0436 -1.0 12.3 GX 17+2 275.9341 -30.2490 8.3 21.9 137.1 -0.0704 -1.4 7.1 H1820-303 285.1197 -24.9865 3.9 26.6 116.3 0.1639 2.9 6.0 HT1900.1-2455 288.7552 10.8187 4.9 39.3 50.8 0.2168 2.4 8.0 GRS 1915+105 262.8218 -33.9834 4.8 19.3 169.9 -0.0988 -2.4 12.2 GX 354-0 259.3677 -30.3196 2.4 15.3 178.2 0.1934 4.9 ------ UNKNOWN 244.8553 5.0330 2.4 24.3 -35.6 0.2178 4.7 ------ UNKNOWN 236.7655 -10.0634 0.3 22.0 -79.6 1.8736 34.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: -239.008000 16.110500 16.992000 63.122000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.7478 -62.7599 13.5 51.2 -161.2 -3.7531 -0.9 2.6 GX 301-2 244.8266 -15.6253 10.5 14.3 -26.7 -1.6949 -1.1 8.9 Sco X-1 256.1719 -37.8720 14.3 10.5 132.3 -1.3431 -0.8 8.9 4U 1700-377 256.2614 -36.3498 25.1 9.5 126.1 -0.7735 -0.5 9.5 GX 349+2 263.0786 -24.9002 13.3 13.8 61.7 -1.3423 -0.9 10.0 GX 1+4 264.8904 -44.5962 4.0 19.9 131.4 5.1693 2.9 10.8 4U 1735-44 268.4727 -1.5360 7.3 33.8 25.6 -3.2855 -1.6 8.0 SW J1753.5-0127 270.3144 -25.2231 4.6 19.8 70.5 -4.3355 -2.5 8.8 GX 5-1 270.1337 -25.8770 0.0 19.5 72.2 3.6973 2.1 12.2 GRS 1758-258 273.9164 -13.8862 101.5 28.2 49.6 0.2398 0.1 10.4 GX 17+2 275.8673 -30.4349 6.3 23.7 86.9 3.4965 1.8 5.1 H1820-303 285.0420 -24.8155 28.7 32.7 78.4 1.1699 0.4 6.3 HT1900.1-2455 263.0086 -33.8170 62.2 13.1 100.7 0.2896 0.2 1.4 GX 354-0 287.5529 -1.4595 3.4 46.5 47.9 19.2142 3.4 ------ UNKNOWN 282.7650 -40.3672 3.3 29.9 108.3 8.1812 3.5 ------ UNKNOWN 275.0526 -17.9101 3.0 26.9 58.1 7.3349 3.8 ------ UNKNOWN 273.8596 -37.0028 2.2 22.4 103.9 9.0078 5.2 ------ UNKNOWN 194.8781 -83.5538 2.6 56.8 173.9 43.4835 4.5 ------ UNKNOWN 251.2194 10.3208 3.5 39.9 -8.1 6.9899 3.3 ------ UNKNOWN 239.5812 -30.9568 3.7 7.8 -115.4 4.3429 3.1 ------ UNKNOWN 189.6158 -72.1217 3.9 52.6 -173.0 13.3225 2.9 ------ UNKNOWN UNKNOWN