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: Fri Oct 19 18:19:32 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger859282
======================================================================
Trigger: 00859282 Segment: 000
BAT Trigger Time: 557789333.952 [s; MET]
Trigger Stop: 557789339.456 [s; MET]
UTC: 2018-09-04T21:28:32.411820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.250355605755 Dec: 46.6232891785215 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.12
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.12
Analysis Position: [ source = BAT ]
RA: 274.250355605755 Dec: 46.6232891785215 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 274.263310828982 Dec: 46.6427217200908 [deg; J2000]
{ 18h 17m 03.2s , +46d 38' 33.8" }
+/- 2.38130573687453 [arcmin] (estimated 90% radius based on SNR)
+/- 0.896178182317934 [arcmin] (formal 1-sigma fit error)
SNR: 8.80665556465317
Angular difference between the analysis and refined position is 1.282319 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 4.63199985027313 +/- 1.03159098510797
Measured from: 1.33200001716614
to: 5.96399986743927 [s; relative to TRIGTIME]
T50: 3.32000005245209 +/- 1.30614712213472
Measured from: 1.78399991989136
to: 5.10399997234344 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.1360000371933
to: 6.1360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.279999971389771
to: 6.55599999427795 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.038698 0.128752 0.113143 0.043573
0.019629 0.020060 0.017848 0.015805 [error]
Peak 0.014272 0.023831 0.026903 0.013190
0.007553 0.008073 0.007153 0.006115 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 6.276 0.280 6.556
T90 4.632 1.332 5.964
T50 3.320 1.784 5.104
Peak 1.000 5.136 6.136
====== 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 -1.050 -0.292 0.313 - - - 3.53e-03 -6.40e-04 6.35e-04 54.810 57
CPL -0.046 -1.127 1.780 101.946 -34.244 -101.946 1.08e-02 -1.08e-02 6.38e-02 53.110 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 -1.257 -0.672 0.706 - - - 4.17e-03 -1.53e-03 1.53e-03 47.080 57
CPL -0.733 -6.480 0.733 133.639 -133.639 -133.639 7.28e-03 N/A N/A 47.000 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 1.86e-08 4.51e-08 8.71e-08 4.13e-07 2.36e-07 5.64e-07 erg/cm2
90%_error_low -6.28e-09 -9.97e-09 -1.69e-08 -1.52e-07 -4.40e-08 -1.64e-07 erg/cm2
90%_error_hi 7.04e-09 9.76e-09 1.67e-08 2.11e-07 4.43e-08 2.14e-07 erg/cm2
Peak flux PL 1.36e-01 1.58e-01 1.32e-01 1.87e-01 4.94e-01 6.14e-01 ph/cm2/s
90%_error_low -8.44e-02 -7.10e-02 -5.75e-02 -1.26e-01 -1.88e-01 -2.30e-01 ph/cm2/s
90%_error_hi 1.06e-01 6.74e-02 5.52e-02 2.28e-01 1.90e-01 2.39e-01 ph/cm2/s
Fluence CPL 1.54e-08 4.95e-08 9.37e-08 1.18e-07 2.18e-07 2.76e-07 erg/cm2
90%_error_low -7.12e-09 -1.19e-08 -1.95e-08 -9.00e-08 -5.12e-08 -1.02e-07 erg/cm2
90%_error_hi 8.08e-09 1.27e-08 2.01e-08 3.54e-07 5.05e-08 4.35e-07 erg/cm2
Peak flux CPL 1.20e-01 1.63e-01 1.40e-01 1.13e-01 4.82e-01 5.37e-01 ph/cm2/s
90%_error_low -1.20e-01 -7.55e-02 -6.43e-02 -1.13e-01 -2.49e-01 -3.04e-01 ph/cm2/s
90%_error_hi 1.21e-01 8.01e-02 4.71e-02 1.36e-01 1.99e-01 2.95e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 274.2633 46.6427 0.0218 30.3233 -48.3657 0.3432554 8.807 TRIG_00859282 Foreground time interval of the image: 0.280 6.556 (delta_t = 6.276 [sec]) Background time interval of the image: -239.952 0.280 (delta_t = 240.232 [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 0.280 sec. to 6.556 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.04961 ( -0.291899 0.313143 ) Norm@50keV : 3.53167E-03 ( -0.000639679 0.000635377 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.81 using 59 PHA bins. # Reduced chi-squared = 0.9617 for 57 degrees of freedom # Null hypothesis probability = 5.575284e-01 Photon flux (15-150 keV) in 6.276 sec: 0.407891 ( -0.075622 0.076209 ) ph/cm2/s Energy fluence (15-150 keV) : 2.3562e-07 ( -4.39687e-08 4.4344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 6.556 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0462091 ( -1.12653 1.77992 ) Epeak [keV] : 101.946 ( -34.2453 -101.948 ) Norm@50keV : 1.08115E-02 ( -0.0108112 0.0638063 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.11 using 59 PHA bins. # Reduced chi-squared = 0.9484 for 56 degrees of freedom # Null hypothesis probability = 5.850411e-01 Photon flux (15-150 keV) in 6.276 sec: 0.392608 ( -0.078255 0.078818 ) ph/cm2/s Energy fluence (15-150 keV) : 2.18309e-07 ( -5.12184e-08 5.05176e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.136 sec. to 6.136 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2572 ( -0.672104 0.705774 ) Norm@50keV : 4.17168E-03 ( -0.00153365 0.00153332 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.08 using 59 PHA bins. # Reduced chi-squared = 0.8260 for 57 degrees of freedom # Null hypothesis probability = 8.226902e-01 Photon flux (15-150 keV) in 1 sec: 0.493984 ( -0.188272 0.190162 ) ph/cm2/s Energy fluence (15-150 keV) : 4.16764e-08 ( -1.65182e-08 1.68754e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.136 sec. to 6.136 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.732676 ( -6.48216 0.730524 ) Epeak [keV] : 133.639 ( -133.244 -133.244 ) Norm@50keV : 7.28158E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.00 using 59 PHA bins. # Reduced chi-squared = 0.8392 for 56 degrees of freedom # Null hypothesis probability = 7.988119e-01 Photon flux (15-150 keV) in 1 sec: 0.481938 ( -0.248521 0.198831 ) ph/cm2/s Energy fluence (15-150 keV) : 4.05425e-08 ( -1.74702e-08 1.77282e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.632 sec. Hardness ratio (energy fluence ratio) = 1.93227976397
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.366957e-08 S(50-150 keV) = 1.7195305e-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 = 3.885904303817314E-01, IMY = 4.371533128550065E-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: -239.952000 0.280000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4651 35.4125 5.2 39.2 -77.5 1.8659 2.2 4.2 Her X-1 268.2934 -1.4814 9.0 37.1 -143.0 0.4602 1.3 4.8 SW J1753.5-0127 270.2991 -25.1455 4.4 54.5 -166.0 2.0289 2.6 4.1 GX 5-1 270.2929 -25.7120 5.1 55.0 -166.3 1.8634 2.3 1.9 GRS 1758-258 273.8797 -14.0864 10.4 43.3 -162.1 0.4310 1.1 7.9 GX 17+2 276.0143 -30.3747 72.3 56.8 -174.3 0.1844 0.2 4.6 H1820-303 285.1582 -24.8964 2.5 49.0 178.3 2.3456 4.5 6.8 HT1900.1-2455 288.8216 10.9612 1.4 14.2 -160.3 1.7804 8.5 1.7 GRS 1915+105 299.6233 35.1849 1.6 12.7 -7.5 1.5651 7.0 1.9 Cyg X-1 308.1557 40.9574 2.5 20.5 7.8 0.9867 4.6 2.1 Cyg X-3 326.4021 38.3710 0.0 29.4 34.7 0.2838 1.1 11.2 Cyg X-2 342.2377 22.0369 3.3 41.4 65.6 3.2079 3.5 ------ UNKNOWN 333.9237 9.4627 2.5 37.5 88.3 2.9443 4.6 ------ UNKNOWN 307.5253 -25.3226 2.6 49.0 151.4 3.7462 4.5 ------ UNKNOWN 356.6704 55.1754 3.3 54.3 21.0 4.5478 3.5 ------ UNKNOWN 309.0589 -16.1098 2.9 40.4 146.1 1.9307 4.0 ------ UNKNOWN 304.0664 -1.2615 2.7 24.8 147.3 1.0428 4.4 ------ UNKNOWN 300.2298 12.1741 2.4 10.8 148.1 0.9310 4.9 ------ UNKNOWN 278.0897 -0.1483 2.2 29.5 -154.4 1.3083 5.2 ------ UNKNOWN 256.5636 -15.3031 3.4 55.0 -146.1 4.9711 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.280000 6.556000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3875 35.4221 7.6 39.3 -77.5 0.1422 1.5 5.9 Her X-1 268.3658 -1.5534 3.9 37.1 -143.1 -0.1304 -3.0 6.1 SW J1753.5-0127 270.2085 -25.0540 2.7 54.4 -165.9 -0.4158 -4.2 4.4 GX 5-1 270.3123 -25.6019 5.1 54.9 -166.3 0.2513 2.4 8.5 GRS 1758-258 273.9789 -13.8969 7.2 43.1 -162.1 -0.0764 -1.6 8.5 GX 17+2 275.9188 -30.5246 9.6 57.0 -174.3 0.1924 1.2 9.5 H1820-303 284.9748 -24.9820 8.8 49.1 178.5 -0.1002 -1.3 5.0 HT1900.1-2455 288.6852 10.8679 3.9 14.3 -160.1 0.0785 3.0 8.1 GRS 1915+105 299.7836 35.2152 7.3 12.8 -6.9 0.0424 1.6 9.5 Cyg X-1 308.2545 41.0695 4.6 20.6 7.8 -0.0665 -2.5 9.6 Cyg X-3 326.0859 38.4606 9.1 29.2 34.3 0.0433 1.3 9.3 Cyg X-2 310.9625 22.3919 2.3 12.7 72.2 0.1454 5.1 ------ UNKNOWN 275.6054 -17.3934 2.2 45.3 -166.6 0.2489 5.3 ------ UNKNOWN 279.6239 22.1937 1.9 16.3 -104.5 0.1902 6.2 ------ UNKNOWN 274.2633 46.6427 1.3 30.3 -48.4 0.3433 8.8 ------ UNKNOWN 253.9483 43.5083 2.5 41.2 -65.3 0.4294 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 111.948680 694.148610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2963 35.5093 0.0 18.6 -139.2 1.0125 2.5 12.7 Her X-1 268.3822 -1.3036 6.9 48.2 168.2 1.8098 1.7 9.0 SW J1753.5-0127 288.5999 10.8954 3.5 37.7 136.9 2.8141 3.4 12.1 GRS 1915+105 299.5893 35.2151 1.7 22.1 92.2 3.5621 7.0 0.8 Cyg X-1 308.0745 40.9755 2.4 24.8 71.0 2.4727 4.8 2.1 Cyg X-3 326.2957 38.2151 3.9 38.6 63.5 3.1461 3.0 8.7 Cyg X-2 295.6802 67.0510 2.4 23.3 1.4 1.9369 4.8 ------ UNKNOWN