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 Dec 17 18:17:27 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger867252
======================================================================
Trigger: 00867252 Segment: 000
BAT Trigger Time: 561344122.688 [s; MET]
Trigger Stop: 561344139.072 [s; MET]
UTC: 2018-10-16T00:55:00.927600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.267907712346 Dec: -35.2789249317542 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 7.28010988928052 [ if not an image trigger ]
Image S/N Ratio: 8.57
Analysis Position: [ source = BAT ]
RA: 231.267907712346 Dec: -35.2789249317542 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 231.27291051103 Dec: -35.3072621162096 [deg; J2000]
{ 15h 25m 05.5s , -35d 18' 26.1" }
+/- 1.83417697426658 [arcmin] (estimated 90% radius based on SNR)
+/- 0.904005559085248 [arcmin] (formal 1-sigma fit error)
SNR: 12.7871498762869
Angular difference between the analysis and refined position is 1.717792 arcmin
Partial Coding Fraction: 0.4960938 [ including projection effects ]
Duration
T90: 111.34399998188 +/- 25.6272959371319
Measured from: -12.9520000219345
to: 98.3919999599457 [s; relative to TRIGTIME]
T50: 51.3199999332428 +/- 12.6112204074095
Measured from: 0.75600004196167
to: 52.0759999752045 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.64400005340576
to: 9.64400005340576 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.0039999485016
to: 110.180000066757 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.748401 1.093348 0.794916 0.335031
0.115289 0.115214 0.097534 0.083055 [error]
Peak 0.033960 0.023816 0.019176 0.016603
0.010458 0.010175 0.008923 0.007653 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 128.184 -18.004 110.180
T90 111.344 -12.952 98.392
T50 51.320 0.756 52.076
Peak 1.000 8.644 9.644
====== 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 -1.512 -0.204 0.204 - - - 1.55e-03 -1.80e-04 1.79e-04 68.940 57
CPL -1.503 -0.211 0.641 9998.720 -9998.720 -9998.720 1.56e-03 -9.38e-04 1.70e-03 68.950 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 -1.415 -0.588 0.612 - - - 6.08e-03 -1.98e-03 1.97e-03 46.330 57
CPL -1.118 1.118 3.425 151.473 -151.473 -151.473 8.56e-03 -8.56e-03 3.49e-01 46.370 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 2.56e-07 4.68e-07 6.57e-07 1.93e-06 1.88e-06 3.31e-06 erg/cm2
90%_error_low -5.05e-08 -5.73e-08 -9.83e-08 -5.57e-07 -2.36e-07 -6.42e-07 erg/cm2
90%_error_hi 5.29e-08 5.66e-08 9.74e-08 6.99e-07 2.38e-07 7.54e-07 erg/cm2
Peak flux PL 2.31e-01 2.44e-01 1.83e-01 2.23e-01 7.43e-01 8.81e-01 ph/cm2/s
90%_error_low -1.27e-01 -9.40e-02 -7.20e-02 -1.39e-01 -2.53e-01 -2.87e-01 ph/cm2/s
90%_error_hi 1.51e-01 8.94e-02 6.95e-02 2.37e-01 2.55e-01 2.89e-01 ph/cm2/s
Fluence CPL 2.58e-07 4.66e-07 6.53e-07 2.00e-06 1.89e-06 3.22e-06 erg/cm2
90%_error_low -5.56e-08 -2.95e-08 -1.11e-07 -1.29e-06 -2.91e-07 -1.14e-06 erg/cm2
90%_error_hi 5.32e-08 6.38e-08 1.20e-07 3.77e-08 1.96e-07 8.02e-07 erg/cm2
Peak flux CPL 2.29e-01 2.45e-01 1.84e-01 2.23e-01 7.42e-01 8.71e-01 ph/cm2/s
90%_error_low -1.56e-01 -5.03e-02 -1.84e-01 -2.23e-01 -2.63e-01 -3.78e-01 ph/cm2/s
90%_error_hi 1.48e-01 1.11e-01 8.48e-02 1.17e-01 2.56e-01 2.94e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 231.2729 -35.3073 0.0151 34.6390 -44.0728 3.3405887 12.787 TRIG_00867252 Foreground time interval of the image: -18.004 110.180 (delta_t = 128.184 [sec]) Background time interval of the image: -236.387 -18.004 (delta_t = 218.383 [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 -18.004 sec. to 110.180 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51152 ( -0.203535 0.203767 ) Norm@50keV : 1.54982E-03 ( -0.000179959 0.000179094 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.94 using 59 PHA bins. # Reduced chi-squared = 1.210 for 57 degrees of freedom # Null hypothesis probability = 1.334336e-01 Photon flux (15-150 keV) in 128.2 sec: 0.194088 ( -0.022899 0.02297 ) ph/cm2/s Energy fluence (15-150 keV) : 1.8816e-06 ( -2.36142e-07 2.38065e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.004 sec. to 110.180 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50297 ( -0.207344 0.644235 ) Epeak [keV] : 9998.72 ( -9999.36 -9999.36 ) Norm@50keV : 1.55547E-03 ( -0.000936568 0.00170007 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.95 using 59 PHA bins. # Reduced chi-squared = 1.231 for 56 degrees of freedom # Null hypothesis probability = 1.146365e-01 Photon flux (15-150 keV) in 128.2 sec: 0.194488 ( -0.024135 0.023346 ) ph/cm2/s Energy fluence (15-150 keV) : 1.89339e-06 ( -2.90701e-07 1.95997e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.644 sec. to 9.644 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41479 ( -0.588082 0.612118 ) Norm@50keV : 6.08172E-03 ( -0.00198009 0.00197489 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.33 using 59 PHA bins. # Reduced chi-squared = 0.8129 for 57 degrees of freedom # Null hypothesis probability = 8.427186e-01 Photon flux (15-150 keV) in 1 sec: 0.743179 ( -0.252895 0.255304 ) ph/cm2/s Energy fluence (15-150 keV) : 5.85976e-08 ( -2.03468e-08 2.06854e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.644 sec. to 9.644 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21331 ( 1.13944 3.44622 ) Epeak [keV] : 77.5624 ( -901.007 -901.007 ) Norm@50keV : 2.05464E-03 ( -0.00205257 0.355536 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.29 using 59 PHA bins. # Reduced chi-squared = 0.8265 for 56 degrees of freedom # Null hypothesis probability = 8.193826e-01 Photon flux (15-150 keV) in 1 sec: 0.742157 ( -0.262763 0.256159 ) ph/cm2/s Energy fluence (15-150 keV) : 5.84696e-08 ( -2.26063e-08 2.06912e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 111.344 sec. Hardness ratio (energy fluence ratio) = 1.40297511371
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.244076e-07 S(50-150 keV) = 1.1571744e-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 = 4.963529887259436E-01, IMY = 4.805424786268802E-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: -236.387410 -18.004000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6872 -40.6556 9.2 41.0 171.0 -0.5276 -1.2 9.4 Vela X-1 170.3325 -60.6282 1.7 12.1 162.2 1.4680 6.8 0.6 Cen X-3 186.6434 -62.6852 2.7 4.2 150.2 0.8968 4.3 5.1 GX 301-2 255.8393 -37.8353 4.2 43.5 -15.6 0.9975 2.8 7.0 4U 1700-377 256.2668 -36.3948 37.5 44.9 -16.5 -0.1224 -0.3 8.3 GX 349+2 262.9334 -24.7214 49.4 57.8 -18.6 -0.2185 -0.2 4.4 GX 1+4 264.7801 -44.4338 858.4 42.7 -1.9 0.0054 0.0 1.9 4U 1735-44 262.8813 -33.9015 235.4 50.1 -12.5 -0.0226 -0.0 6.7 GX 354-0 182.3390 -79.0601 4.2 17.9 86.6 0.6513 2.7 ------ UNKNOWN 239.5402 -46.6896 2.0 29.1 -21.7 1.3185 5.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -18.004000 110.180000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7391 -40.6176 31.7 41.0 171.1 -0.1142 -0.4 10.3 Vela X-1 170.1335 -60.7401 27.3 12.1 161.6 -0.0704 -0.4 8.8 Cen X-3 186.6984 -62.7802 2.8 4.2 148.9 -0.6465 -4.1 1.3 GX 301-2 255.9221 -38.0087 0.0 43.4 -15.4 0.7920 2.8 10.3 4U 1700-377 256.2221 -36.3985 30.6 44.9 -16.5 -0.1167 -0.4 10.4 GX 349+2 263.0858 -24.6961 25.0 57.9 -18.5 0.4239 0.5 5.1 GX 1+4 264.6368 -44.5678 7.1 42.5 -1.9 0.4993 1.6 8.4 4U 1735-44 262.9773 -33.7928 7.6 50.2 -12.5 0.5318 1.5 2.6 GX 354-0 274.5809 -74.6353 2.3 29.3 46.5 1.2824 5.1 ------ UNKNOWN 282.5798 -46.5860 2.5 49.1 13.3 1.8936 4.6 ------ UNKNOWN 256.1356 -58.3975 2.2 29.4 10.1 1.1474 5.3 ------ UNKNOWN 231.2729 -35.3072 0.9 34.6 -44.1 3.3405 12.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 828.812590 962.481300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3238 -60.7358 6.5 47.3 -158.7 0.7149 1.8 6.8 Cen X-3 186.6711 -62.7903 2.2 39.4 -160.5 1.6285 5.3 1.3 GX 301-2 244.9818 -15.6357 0.5 26.9 -21.3 4.5254 21.8 0.3 Sco X-1 256.0072 -37.8557 2.1 8.9 42.5 1.0030 5.4 1.2 4U 1700-377 256.4065 -36.4513 2.5 10.0 37.0 0.8731 4.5 2.2 GX 349+2 262.8576 -24.7137 7.8 22.5 24.2 -0.2794 -1.5 8.5 GX 1+4 264.9704 -44.3321 3.7 13.8 85.1 0.5729 3.1 12.0 4U 1735-44 268.4437 -1.3187 3.8 45.8 13.1 -1.2301 -3.0 9.2 SW J1753.5-0127 270.3283 -24.9911 3.4 26.5 37.5 0.8039 3.4 5.8 GX 5-1 270.1508 -25.6224 11.2 25.9 38.2 0.2311 1.0 10.9 GRS 1758-258 274.1363 -13.9846 4.0 37.4 29.8 0.9007 2.9 8.2 GX 17+2 276.0241 -30.5127 5.5 26.7 54.2 0.5093 2.1 10.1 H1820-303 284.9009 -25.0467 0.0 36.2 54.9 1.1378 2.8 10.6 HT1900.1-2455 262.8189 -33.7816 4.3 15.7 42.8 0.5188 2.7 9.1 GX 354-0 289.1114 -11.1721 3.1 48.7 44.1 3.0793 3.8 ------ UNKNOWN 185.3650 -37.0664 2.1 46.0 -123.4 4.7804 5.4 ------ UNKNOWN