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: Sat Jan 20 04:59:48 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger785850
======================================================================
Trigger: 00785850 Segment: 000
BAT Trigger Time: 531443452.012 [s; MET]
Trigger Stop: 531443452.076 [s; MET]
UTC: 2017-11-03T23:10:32.067600 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 249.535607366346 Dec: -10.2151202797463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 77.2657750883274 [ if not an image trigger ]
Image S/N Ratio: 9.35
Analysis Position: [ source = BAT ]
RA: 249.535607366346 Dec: -10.2151202797463 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 249.507007896054 Dec: -10.2058206757051 [deg; J2000]
{ 16h 38m 01.7s , -10d 12' 21.0" }
+/- 1.45945826552915 [arcmin] (estimated 90% radius based on SNR)
+/- 0.596209037451503 [arcmin] (formal 1-sigma fit error)
SNR: 17.7238814480927
Angular difference between the analysis and refined position is 1.778583 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 4.26799994707108 +/- 1.10585354557227
Measured from: -0.324000000953674
to: 3.9439999461174 [s; relative to TRIGTIME]
T50: 0.327999949455261 +/- 1.07674321374998
Measured from: 0
to: 0.327999949455261 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.37200003862381
to: 0.62799996137619 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.37200003862381
to: 4.66799998283386 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149025 0.205633 0.169379 0.084103
0.019816 0.019517 0.017791 0.015419 [error]
Peak 0.101494 0.157882 0.153299 0.065094
0.010450 0.011311 0.011212 0.009773 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.040 -0.372 4.668
T90 4.268 -0.324 3.944
T50 0.328 0.000 0.328
Peak 1.000 -0.372 0.628
====== 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 -1.322 -0.184 0.185 - - - 7.60e-03 -7.63e-04 7.60e-04 59.520 57
CPL -1.325 -0.179 0.241 9999.360 -9999.360 -9999.360 7.62e-03 -2.71e-03 5.10e-03 59.530 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 -1.153 -0.135 0.136 - - - 3.06e-02 -2.29e-03 2.29e-03 56.580 57
CPL -1.151 -0.134 0.140 9999.350 -9999.350 -9999.350 3.07e-02 -2.28e-03 1.71e-02 56.600 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 4.14e-08 8.49e-08 1.36e-07 4.85e-07 3.77e-07 7.47e-07 erg/cm2
90%_error_low -7.57e-09 -9.39e-09 -1.75e-08 -1.26e-07 -4.26e-08 -1.39e-07 erg/cm2
90%_error_hi 7.97e-09 9.26e-09 1.73e-08 1.55e-07 4.30e-08 1.64e-07 erg/cm2
Peak flux PL 9.05e-01 1.12e+00 1.01e+00 1.57e+00 3.57e+00 4.60e+00 ph/cm2/s
90%_error_low -1.29e-01 -9.82e-02 -9.04e-02 -2.85e-01 -2.71e-01 -3.77e-01 ph/cm2/s
90%_error_hi 1.35e-01 9.70e-02 8.96e-02 3.25e-01 2.71e-01 3.86e-01 ph/cm2/s
Fluence CPL 4.14e-08 8.33e-08 1.34e-07 4.82e-07 3.81e-07 7.55e-07 erg/cm2
90%_error_low N/A N/A N/A N/A N/A -2.72e-07 erg/cm2
90%_error_hi N/A N/A N/A N/A N/A 6.36e-08 erg/cm2
Peak flux CPL 9.04e-01 1.12e+00 1.01e+00 1.56e+00 3.58e+00 4.63e+00 ph/cm2/s
90%_error_low N/A -9.92e-02 -8.90e-02 N/A N/A -7.23e-01 ph/cm2/s
90%_error_hi N/A 1.05e-01 9.67e-02 N/A N/A 3.32e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 249.5070 -10.2058 0.0108 21.5140 -96.3880 0.6466647 17.724 TRIG_00785850 Foreground time interval of the image: -0.372 4.668 (delta_t = 5.040 [sec]) Background time interval of the image: -239.012 -0.372 (delta_t = 238.640 [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 -0.372 sec. to 4.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32226 ( -0.183926 0.185177 ) Norm@50keV : 7.60375E-03 ( -0.000763057 0.000760395 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.52 using 59 PHA bins. # Reduced chi-squared = 1.044 for 57 degrees of freedom # Null hypothesis probability = 3.841863e-01 Photon flux (15-150 keV) in 5.04 sec: 0.910982 ( -0.092928 0.093148 ) ph/cm2/s Energy fluence (15-150 keV) : 3.7673e-07 ( -4.25811e-08 4.30194e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 4.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32472 ( -0.180541 0.239302 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 7.61556E-03 ( -0.00272301 0.0050837 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.53 using 59 PHA bins. # Reduced chi-squared = 1.063 for 56 degrees of freedom # Null hypothesis probability = 3.483545e-01 Photon flux (15-150 keV) in 5.04 sec: 0.915368 ( -0.112446 0.102772 ) ph/cm2/s Energy fluence (15-150 keV) : 3.81488e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.372 sec. to 0.628 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15312 ( -0.135092 0.136352 ) Norm@50keV : 3.06185E-02 ( -0.00228991 0.00228933 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.58 using 59 PHA bins. # Reduced chi-squared = 0.9927 for 57 degrees of freedom # Null hypothesis probability = 4.906342e-01 Photon flux (15-150 keV) in 1 sec: 3.57208 ( -0.271 0.27127 ) ph/cm2/s Energy fluence (15-150 keV) : 3.14942e-07 ( -2.70895e-08 2.73289e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 0.628 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15111 ( -0.134218 0.138945 ) Epeak [keV] : 9999.35 ( -9999.36 -9999.36 ) Norm@50keV : 3.07493E-02 ( -0.0022986 0.0170455 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.60 using 59 PHA bins. # Reduced chi-squared = 1.011 for 56 degrees of freedom # Null hypothesis probability = 4.526039e-01 Photon flux (15-150 keV) in 1 sec: 3.57718 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.1633e-07 ( -3.35817e-08 3.09582e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.268 sec. Hardness ratio (energy fluence ratio) = 1.59966789383
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2633587e-07 S(50-150 keV) = 2.503932e-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 = -4.385784878054998E-02, IMY = 3.917445794173244E-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: -239.012000 -0.372000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9790 -15.6240 0.4 28.3 -100.2 10.3787 28.2 1.0 Sco X-1 254.2759 35.4036 4.7 34.5 13.2 0.7994 2.5 9.6 Her X-1 256.0829 -37.9584 7.0 42.0 -136.3 0.8065 1.6 8.2 4U 1700-377 256.4565 -36.4574 5.3 40.4 -136.1 1.0457 2.2 2.3 GX 349+2 262.9874 -24.7584 2.6 27.8 -141.6 1.2165 4.4 1.4 GX 1+4 264.7217 -44.4593 25.0 47.3 -146.9 0.3025 0.5 1.1 4U 1735-44 268.3846 -1.3779 7.8 4.6 -170.8 0.3518 1.5 4.6 SW J1753.5-0127 270.4296 -25.1352 6.1 28.2 -156.0 -0.5166 -1.9 8.6 GX 5-1 270.2379 -25.7290 14.0 28.8 -155.5 0.2231 0.8 3.6 GRS 1758-258 273.9406 -13.9540 4.8 18.3 -171.8 0.5825 2.4 6.2 GX 17+2 275.8682 -30.5122 4.6 34.5 -162.8 0.7851 2.5 9.2 H1820-303 285.1059 -25.0593 23.4 33.1 179.6 -0.1594 -0.5 9.2 HT1900.1-2455 288.8219 10.9322 2.1 23.4 99.9 1.8954 5.6 1.6 GRS 1915+105 262.9843 -33.8384 145.8 36.9 -143.7 0.0303 0.1 0.3 GX 354-0 252.0532 55.8575 2.9 54.3 21.2 5.8719 3.9 ------ UNKNOWN 299.0095 -44.7007 3.0 55.6 -176.2 4.8218 3.8 ------ UNKNOWN 224.0265 43.5037 2.8 55.5 -5.4 3.2321 4.1 ------ UNKNOWN 281.5911 -35.0258 2.9 40.4 -167.8 1.4036 4.0 ------ UNKNOWN 234.0556 31.0477 2.8 41.7 -12.7 1.3797 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.372000 4.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8764 -15.5423 7.4 28.3 -99.9 -0.0708 -1.6 8.4 Sco X-1 254.2984 35.4353 13.6 34.5 13.3 0.0316 0.8 9.6 Her X-1 256.0910 -37.9227 22.3 41.9 -136.3 0.0331 0.5 6.8 4U 1700-377 256.3064 -36.5060 5.2 40.5 -135.9 -0.1227 -2.2 8.0 GX 349+2 263.1500 -24.7972 68.3 27.9 -141.9 0.0057 0.2 8.3 GX 1+4 264.6284 -44.3344 9.8 47.2 -146.8 -0.0890 -1.2 8.5 4U 1735-44 268.5737 -1.5035 0.0 4.8 -172.3 0.0867 3.0 12.7 SW J1753.5-0127 270.4345 -25.0378 8.4 28.1 -156.0 0.0475 1.4 8.5 GX 5-1 270.3619 -25.8817 7.4 29.0 -155.6 0.0545 1.6 8.9 GRS 1758-258 274.0484 -13.8352 0.0 18.2 -172.3 0.0627 2.2 12.3 GX 17+2 275.8339 -30.3429 13.6 34.3 -162.9 -0.0303 -0.8 4.9 H1820-303 284.9991 -24.8397 5.2 32.9 179.5 -0.0792 -2.2 5.2 HT1900.1-2455 288.9695 10.8819 7.8 23.5 100.2 -0.0553 -1.5 10.8 GRS 1915+105 263.1111 -33.7509 9.8 36.8 -143.8 -0.0530 -1.2 7.9 GX 354-0 278.6262 -6.2499 2.6 15.0 158.6 0.1204 4.5 ------ UNKNOWN 249.5070 -10.2058 0.6 21.5 -96.4 0.6468 17.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 686.388600 963.059500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 21.8032 2.1887 2.6 24.8 92.5 1.4235 4.5 ------ UNKNOWN 347.3122 -37.3727 3.5 28.7 -122.5 1.0216 3.3 ------ UNKNOWN