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 22:34:12 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1064221
======================================================================
Trigger: 01064221 Segment: 000
BAT Trigger Time: 650023448 [s; MET]
Trigger Stop: 650023560 [s; MET]
UTC: 2021-08-07T10:03:40.494060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.6773872559415 Dec: 58.2452268281704 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.28
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.28
Analysis Position: [ source = BAT ]
RA: 76.6773872559415 Dec: 58.2452268281704 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 76.7173235115483 Dec: 58.2595832256889 [deg; J2000]
{ 05h 06m 52.2s , +58d 15' 34.5" }
+/- 2.661542925371 [arcmin] (estimated 90% radius based on SNR)
+/- 1.22023049267872 [arcmin] (formal 1-sigma fit error)
SNR: 7.5125062178386
Angular difference between the analysis and refined position is 1.526970 arcmin
Partial Coding Fraction: 0.28125 [ including projection effects ]
Duration
T90: 143.664000034332 +/- 45.6177621579512
Measured from: 15.1599999666214
to: 158.824000000954 [s; relative to TRIGTIME]
T50: 62.1599999666214 +/- 5.15888353618346
Measured from: 72.2480000257492
to: 134.407999992371 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 70.5240000486374
to: 71.5240000486374 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.44799995422363
to: 170.968000054359 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.126463 3.878168 4.038354 1.822641
0.157738 0.165909 0.150414 0.131000 [error]
Peak 0.046485 0.040886 0.108815 0.053549
0.012805 0.014727 0.013785 0.011853 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 180.416 -9.448 170.968
T90 143.664 15.160 158.824
T50 62.160 72.248 134.408
Peak 1.000 70.524 71.524
====== 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 -1.133 -0.076 0.077 - - - 4.63e-03 -2.04e-04 2.03e-04 53.420 57
CPL -1.033 -0.134 0.316 585.119 -585.119 -585.119 5.10e-03 -6.07e-04 1.76e-03 53.100 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 -0.764 -0.317 0.361 - - - 1.58e-02 -3.44e-03 3.25e-03 53.220 57
CPL -0.724 -0.655 1.144 9899.820 -9899.820 -9899.820 1.58e-02 -3.26e-03 -1.58e-02 53.240 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 7.57e-07 1.74e-06 3.18e-06 1.38e-05 8.64e-06 1.95e-05 erg/cm2
90%_error_low -7.03e-08 -9.81e-08 -1.42e-07 -1.39e-06 -3.70e-07 -1.44e-06 erg/cm2
90%_error_hi 7.29e-08 9.75e-08 1.41e-07 1.50e-06 3.70e-07 1.53e-06 erg/cm2
Peak flux PL 3.23e-01 5.06e-01 5.96e-01 1.36e+00 1.82e+00 2.78e+00 ph/cm2/s
90%_error_low -1.36e-01 -1.47e-01 -1.01e-01 -4.36e-01 -3.61e-01 -4.92e-01 ph/cm2/s
90%_error_hi 1.66e-01 1.46e-01 1.01e-01 5.78e-01 3.68e-01 5.17e-01 ph/cm2/s
Fluence CPL 7.35e-07 1.75e-06 3.22e-06 1.22e-05 8.61e-06 1.79e-05 erg/cm2
90%_error_low -9.34e-08 -1.00e-07 -1.59e-07 -3.64e-06 -3.80e-07 -3.60e-06 erg/cm2
90%_error_hi 8.18e-08 1.01e-07 1.83e-07 1.12e-06 3.75e-07 2.93e-06 erg/cm2
Peak flux CPL 3.13e-01 5.03e-01 6.10e-01 1.19e+00 1.81e+00 2.75e+00 ph/cm2/s
90%_error_low -3.13e-01 -1.66e-01 -1.13e-01 -7.15e-01 -3.85e-01 -1.06e+00 ph/cm2/s
90%_error_hi 1.26e-01 1.50e-01 1.51e-01 7.50e-01 3.61e-01 5.06e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 76.7173 58.2596 0.0255 49.3168 3.8274 17.0093023 7.513 TRIG_01064221 Foreground time interval of the image: -9.448 121.301 (delta_t = 130.749 [sec]) Background time interval of the image: -11.099 -9.448 (delta_t = 1.651 [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 -9.448 sec. to 170.968 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13343 ( -0.0762066 0.0773062 ) Norm@50keV : 4.62820E-03 ( -0.000203613 0.000202747 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.42 using 59 bins. Reduced chi-squared = 0.937193 # Null hypothesis probability of 6.10e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 180.4 sec: 0.538714 ( -0.025409 0.025509 ) ph/cm2/s Energy fluence (15-150 keV) : 8.63946e-06 ( -3.70206e-07 3.70365e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.448 sec. to 170.968 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03274 ( -0.133686 0.316164 ) Epeak [keV] : 585.119 ( -586.314 -586.314 ) Norm@50keV : 5.10088E-03 ( -0.000605712 0.00175694 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.10 using 59 bins. Reduced chi-squared = 0.948214 # Null hypothesis probability of 5.86e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 180.4 sec: 0.535756 ( -0.026789 0.026824 ) ph/cm2/s Energy fluence (15-150 keV) : 8.61284e-06 ( -3.79866e-07 3.75441e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 70.524 sec. to 71.524 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.763834 ( -0.317443 0.360923 ) Norm@50keV : 1.58297E-02 ( -0.00343821 0.00325134 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.22 using 59 bins. Reduced chi-squared = 0.933684 # Null hypothesis probability of 6.18e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.82217 ( -0.36144 0.36844 ) ph/cm2/s Energy fluence (15-150 keV) : 1.87875e-07 ( -3.19197e-08 3.19059e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 70.524 sec. to 71.524 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.755175 ( -0.65528 1.14402 ) Epeak [keV] : 10000.00 ( -10000 -10000 ) Norm@50keV : 1.59436E-02 ( -0.00345108 -0.0159436 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.22 using 59 bins. Reduced chi-squared = 0.950357 # Null hypothesis probability of 5.81e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.80599 ( -0.38496 0.36071 ) ph/cm2/s Energy fluence (15-150 keV) : 1.87655e-07 ( -3.20907e-08 3.19893e-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 = 1.160703420316407E+00, IMY = -7.765187250656860E-02
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: -11.099410 -9.448000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 239.6778 68.7333 2.0 29.4 87.5 0.1202 5.7 ------ UNKNOWN 119.8248 30.0539 2.8 47.9 -51.2 0.2726 4.2 ------ UNKNOWN 148.4250 21.7630 2.6 40.9 -88.9 0.2246 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.448000 121.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 177.6206 69.8889 2.4 13.5 46.2 5.1837 4.8 ------ UNKNOWN 76.7173 58.2596 1.5 49.3 3.8 17.0140 7.5 ------ UNKNOWN 84.1320 42.3141 3.1 57.8 -14.0 17.3356 3.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 190.700600 697.400620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6323 22.0170 0.4 36.5 -27.2 20.5930 32.8 0.2 Crab 44.1117 48.7028 2.6 21.3 61.4 2.2407 4.5 ------ UNKNOWN 218.9646 76.6809 3.8 43.0 175.5 2.6408 3.1 ------ UNKNOWN 62.1238 9.8364 3.0 49.6 2.6 3.5704 3.8 ------ UNKNOWN 76.5556 58.2646 2.0 0.1 106.1 2.4386 5.7 ------ UNKNOWN