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 19:02:17 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger866434
======================================================================
Trigger: 00866434 Segment: 000
BAT Trigger Time: 560843773.44 [s; MET]
Trigger Stop: 560843774.464 [s; MET]
UTC: 2018-10-10T05:55:51.710680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 52.5574971856556 Dec: -23.0353985197853 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.39
Analysis Position: [ source = BAT ]
RA: 52.5574971856556 Dec: -23.0353985197853 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 52.5696135071614 Dec: -23.0194997798423 [deg; J2000]
{ 03h 30m 16.7s , -23d 01' 10.2" }
+/- 1.44710639313661 [arcmin] (estimated 90% radius based on SNR)
+/- 0.440752078974865 [arcmin] (formal 1-sigma fit error)
SNR: 17.940395190335
Angular difference between the analysis and refined position is 1.165162 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 15.5639998912811 +/- 2.19279273395347
Measured from: -2.37600004673004
to: 13.1879998445511 [s; relative to TRIGTIME]
T50: 8.03199994564056 +/- 0.964895872208353
Measured from: 0.247999906539917
to: 8.27999985218048 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.43199992179871
to: 8.43199992179871 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.0440000295639
to: 15.2119998931885 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.332657 0.395702 0.320685 0.066890
0.029997 0.031442 0.027636 0.023447 [error]
Peak 0.034974 0.063433 0.065319 0.017348
0.007515 0.008179 0.007567 0.006408 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 19.256 -4.044 15.212
T90 15.564 -2.376 13.188
T50 8.032 0.248 8.280
Peak 1.000 7.432 8.432
====== 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 -1.516 -0.148 0.147 - - - 3.80e-03 -3.27e-04 3.25e-04 56.200 57
CPL -1.420 -0.233 0.559 271.148 -271.148 -271.148 4.26e-03 -1.41e-03 3.86e-03 56.140 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 -1.178 -0.228 0.233 - - - 1.22e-02 -1.60e-03 1.60e-03 61.240 57
CPL -0.846 -0.529 1.062 182.576 -182.576 -182.576 1.77e-02 -8.69e-03 3.78e-02 60.840 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 9.50e-08 1.73e-07 2.42e-07 7.07e-07 6.93e-07 1.22e-06 erg/cm2
90%_error_low -1.31e-08 -1.48e-08 -2.73e-08 -1.57e-07 -6.52e-08 -1.81e-07 erg/cm2
90%_error_hi 1.35e-08 1.48e-08 2.72e-08 1.85e-07 6.59e-08 2.04e-07 erg/cm2
Peak flux PL 3.69e-01 4.50e-01 3.98e-01 6.06e-01 1.43e+00 1.82e+00 ph/cm2/s
90%_error_low -8.90e-02 -6.93e-02 -6.18e-02 -1.78e-01 -1.91e-01 -2.56e-01 ph/cm2/s
90%_error_hi 9.56e-02 6.80e-02 6.10e-02 2.22e-01 1.91e-01 2.64e-01 ph/cm2/s
Fluence CPL 9.37e-08 1.75e-07 2.43e-07 6.01e-07 6.87e-07 1.11e-06 erg/cm2
90%_error_low -1.49e-08 -1.63e-08 -2.81e-08 -3.38e-07 -7.24e-08 -3.44e-07 erg/cm2
90%_error_hi 1.12e-08 1.82e-08 2.87e-08 1.43e-07 7.01e-08 2.93e-07 erg/cm2
Peak flux CPL 3.45e-01 4.63e-01 4.11e-01 4.14e-01 1.41e+00 1.63e+00 ph/cm2/s
90%_error_low -1.09e-01 -7.69e-02 -6.99e-02 -2.53e-01 -1.99e-01 -3.38e-01 ph/cm2/s
90%_error_hi 1.12e-01 8.02e-02 7.25e-02 2.50e-01 1.98e-01 3.33e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 52.5696 -23.0195 0.0107 26.5241 -152.8488 1.1086751 17.940 TRIG_00866434 Foreground time interval of the image: -4.044 15.061 (delta_t = 19.105 [sec]) Background time interval of the image: -239.440 -4.044 (delta_t = 235.396 [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 -4.044 sec. to 15.212 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51618 ( -0.147586 0.146592 ) Norm@50keV : 3.80319E-03 ( -0.000327136 0.000325097 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.20 using 59 PHA bins. # Reduced chi-squared = 0.9860 for 57 degrees of freedom # Null hypothesis probability = 5.050662e-01 Photon flux (15-150 keV) in 19.26 sec: 0.476896 ( -0.04004 0.040077 ) ph/cm2/s Energy fluence (15-150 keV) : 6.93164e-07 ( -6.52119e-08 6.59143e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.044 sec. to 15.212 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.42013 ( -0.233291 0.558717 ) Epeak [keV] : 271.148 ( -297.266 -297.266 ) Norm@50keV : 4.26478E-03 ( -0.00140632 0.00386299 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.14 using 59 PHA bins. # Reduced chi-squared = 1.003 for 56 degrees of freedom # Null hypothesis probability = 4.696026e-01 Photon flux (15-150 keV) in 19.26 sec: 0.474975 ( -0.041331 0.041092 ) ph/cm2/s Energy fluence (15-150 keV) : 6.8749e-07 ( -7.23604e-08 7.01389e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.432 sec. to 8.432 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17783 ( -0.227914 0.232748 ) Norm@50keV : 1.22037E-02 ( -0.00160278 0.00160239 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.24 using 59 PHA bins. # Reduced chi-squared = 1.074 for 57 degrees of freedom # Null hypothesis probability = 3.264013e-01 Photon flux (15-150 keV) in 1 sec: 1.42816 ( -0.19105 0.19135 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24615e-07 ( -1.84063e-08 1.86269e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.432 sec. to 8.432 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.846355 ( -0.529411 1.06232 ) Epeak [keV] : 182.576 ( -182.579 -182.579 ) Norm@50keV : 1.76990E-02 ( -0.00869393 0.0378323 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.84 using 59 PHA bins. # Reduced chi-squared = 1.086 for 56 degrees of freedom # Null hypothesis probability = 3.058428e-01 Photon flux (15-150 keV) in 1 sec: 1.40862 ( -0.19936 0.19828 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2154e-07 ( -2.05473e-08 2.02547e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 15.564 sec. Hardness ratio (energy fluence ratio) = 1.39846024826
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.6774451e-07 S(50-150 keV) = 4.254278e-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 = -4.441075137294401E-01, IMY = 2.277622207855807E-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: -239.440000 -4.044000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 325.4875 -13.0877 3.4 57.1 7.1 4.5463 3.4 ------ UNKNOWN 333.1154 -13.0016 3.6 49.8 9.3 1.5803 3.2 ------ UNKNOWN 16.5645 -15.6778 2.3 8.1 26.3 1.0601 5.1 ------ UNKNOWN 346.3697 -42.5266 2.5 40.7 -34.1 1.5013 4.6 ------ UNKNOWN 355.9793 -58.1200 2.6 45.4 -57.7 4.6895 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.044000 15.060600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 64.4548 -9.3357 2.2 39.5 -175.8 0.4301 5.2 ------ UNKNOWN 52.5696 -23.0195 0.6 26.5 -152.8 1.1087 17.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.060600 619.860590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6409 22.0256 0.9 54.3 -178.6 20.1358 13.4 0.8 Crab 26.3282 7.4479 2.5 39.8 102.2 7.2632 4.7 ------ UNKNOWN 0.6313 -26.3557 3.7 47.0 40.1 4.5988 3.1 ------ UNKNOWN 15.1942 -54.8492 2.7 42.2 -3.3 2.9085 4.2 ------ UNKNOWN