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 v2.48
Process Start Time: Fri Jul 29 22:49:00 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1061284
======================================================================
Trigger: 01061284 Segment: 000
BAT Trigger Time: 648744398.336 [s; MET]
Trigger Stop: 648744399.36 [s; MET]
UTC: 2021-07-23T14:46:10.915460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 121.726128854254 Dec: -32.889330847315 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.56
Image Trigger?: NO
Rate S/N Ratio: 36.3455636907725 [ if not an image trigger ]
Image S/N Ratio: 14.56
Analysis Position: [ source = BAT ]
RA: 121.726128854254 Dec: -32.889330847315 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 121.720931608691 Dec: -32.8937052398194 [deg; J2000]
{ 08h 06m 53.0s , -32d 53' 37.3" }
+/- 0.660909558124809 [arcmin] (estimated 90% radius based on SNR)
+/- 0.175657637037275 [arcmin] (formal 1-sigma fit error)
SNR: 54.961469164534
Angular difference between the analysis and refined position is 0.370744 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 55.0639998912811 +/- 449.680242135536
Measured from: -1.89199995994568
to: 53.1719999313354 [s; relative to TRIGTIME]
T50: 18.9719998836517 +/- 4.09143896092851
Measured from: 3.96800005435944
to: 22.9399999380112 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.68400001525879
to: 3.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.58799993991852
to: 612.796000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.029715 3.890308 2.840110 0.432043
0.173856 0.179570 0.157314 0.139893 [error]
Peak 0.071580 0.132988 0.133408 0.023526
0.009608 0.010925 0.010613 0.007401 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 617.384 -4.588 612.796
T90 55.064 -1.892 53.172
T50 18.972 3.968 22.940
Peak 1.000 2.684 3.684
====== 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: N/A)
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 -1.650 -0.099 0.098 - - - 1.07e-03 -6.00e-05 5.97e-05 63.310 57
CPL -1.261 -0.387 0.424 94.891 -26.431 2079.139 1.68e-03 -5.92e-04 1.03e-03 60.370 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.144 -0.137 0.139 - - - 2.46e-02 -2.16e-03 2.16e-03 63.820 57
CPL -0.173 -0.591 0.691 101.476 -22.575 72.326 7.15e-02 -3.34e-02 7.64e-02 55.240 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 9.75e-07 1.64e-06 2.08e-06 5.33e-06 6.17e-06 1.00e-05 erg/cm2
90%_error_low -8.87e-08 -9.04e-08 -1.56e-07 -8.12e-07 -3.66e-07 -9.41e-07 erg/cm2
90%_error_hi 9.13e-08 9.01e-08 1.56e-07 9.06e-07 3.68e-07 1.02e-06 erg/cm2
Peak flux PL 7.20e-01 8.96e-01 8.11e-01 1.27e+00 2.87e+00 3.70e+00 ph/cm2/s
90%_error_low -1.13e-01 -9.17e-02 -7.95e-02 -2.35e-01 -2.57e-01 -3.42e-01 ph/cm2/s
90%_error_hi 1.18e-01 9.09e-02 7.90e-02 2.65e-01 2.57e-01 3.46e-01 ph/cm2/s
Fluence CPL 9.09e-07 1.69e-06 2.13e-06 3.04e-06 5.98e-06 7.77e-06 erg/cm2
90%_error_low -1.10e-07 -1.07e-07 -1.66e-07 -1.22e-06 -4.12e-07 -1.29e-06 erg/cm2
90%_error_hi 1.11e-07 1.08e-07 1.68e-07 2.28e-06 4.13e-07 2.29e-06 erg/cm2
Peak flux CPL 5.87e-01 9.72e-01 9.04e-01 5.39e-01 2.80e+00 3.00e+00 ph/cm2/s
90%_error_low -1.34e-01 -1.08e-01 -9.88e-02 -2.11e-01 -2.62e-01 -3.37e-01 ph/cm2/s
90%_error_hi 1.40e-01 1.11e-01 1.01e-01 3.48e-01 2.61e-01 4.04e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 121.7209 -32.8937 0.0035 31.3072 -15.3239 5.9106283 54.961 TRIG_01061284 Foreground time interval of the image: -4.588 15.565 (delta_t = 20.153 [sec]) Background time interval of the image: -239.336 -4.588 (delta_t = 234.748 [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 -4.588 sec. to 612.796 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64963 ( -0.0994708 0.0983616 ) Norm@50keV : 1.07438E-03 ( -5.99789e-05 5.9693e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.31 using 59 bins. Reduced chi-squared = 1.1107 # Null hypothesis probability of 2.64e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 617.4 sec: 0.140275 ( -0.007725 0.00774 ) ph/cm2/s Energy fluence (15-150 keV) : 6.17016e-06 ( -3.65635e-07 3.68317e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.588 sec. to 612.796 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.26114 ( -0.387055 0.423607 ) Epeak [keV] : 94.8909 ( -26.4307 2079.13 ) Norm@50keV : 1.68193E-03 ( -0.000592364 0.001028 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 60.37 using 59 bins. Reduced chi-squared = 1.07804 # Null hypothesis probability of 3.21e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 617.4 sec: 0.137011 ( -0.008358 0.008363 ) ph/cm2/s Energy fluence (15-150 keV) : 5.97801e-06 ( -4.11713e-07 4.13397e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.684 sec. to 3.684 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14438 ( -0.136796 0.138675 ) Norm@50keV : 2.45922E-02 ( -0.00215661 0.00215625 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.82 using 59 bins. Reduced chi-squared = 1.11965 # Null hypothesis probability of 2.49e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.86605 ( -0.25714 0.25745 ) ph/cm2/s Energy fluence (15-150 keV) : 2.53618e-07 ( -2.41141e-08 2.42573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.684 sec. to 3.684 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.172854 ( -0.591316 0.690651 ) Epeak [keV] : 101.476 ( -22.5747 72.3258 ) Norm@50keV : 7.14862E-02 ( -0.0334326 0.0763619 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.24 using 59 bins. Reduced chi-squared = 0.986429 # Null hypothesis probability of 5.04e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.79812 ( -0.26151 0.26148 ) ph/cm2/s Energy fluence (15-150 keV) : 2.42633e-07 ( -2.59823e-08 2.58396e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 5.865584203005796E-01, IMY = 1.607272149705196E-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: -239.336000 -4.588000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6056 22.0157 0.6 41.6 -147.2 10.4168 19.7 1.5 Crab 135.3912 -40.6232 8.9 44.0 -8.5 0.6430 1.3 7.5 Vela X-1 67.5005 14.5693 3.1 40.4 -173.2 1.6521 3.7 ------ UNKNOWN 149.8326 -33.2996 4.3 54.6 -20.0 2.5869 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.588000 15.564600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6287 22.0225 369.4 41.6 -147.2 -0.0050 -0.0 0.5 Crab 135.5550 -40.4425 4.2 44.1 -8.8 0.4431 2.8 6.8 Vela X-1 67.5607 -26.6406 2.6 22.2 108.0 0.4924 4.4 ------ UNKNOWN 121.7209 -32.8937 0.2 31.3 -15.3 5.9107 55.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 78.164590 962.716300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5179 -40.5792 1.2 13.4 37.4 6.9872 9.6 1.5 Vela X-1 170.1161 -60.6306 5.7 41.7 55.0 4.0549 2.0 5.9 Cen X-3 119.7678 -0.9425 2.6 32.0 -95.3 5.6908 4.4 ------ UNKNOWN