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 22:47:22 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1061482
======================================================================
Trigger: 01061482 Segment: 000
BAT Trigger Time: 648850476.672 [s; MET]
Trigger Stop: 648850480.768 [s; MET]
UTC: 2021-07-24T20:14:09.244380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.407397668851 Dec: -6.27450560577922 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.21
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.21
Analysis Position: [ source = BAT ]
RA: 227.407397668851 Dec: -6.27450560577922 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 227.431008044548 Dec: -6.27370168968258 [deg; J2000]
{ 15h 09m 43.4s , -06d 16' 25.3" }
+/- 1.80651896658924 [arcmin] (estimated 90% radius based on SNR)
+/- 0.810627025245755 [arcmin] (formal 1-sigma fit error)
SNR: 13.0677400386894
Angular difference between the analysis and refined position is 1.408964 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 44.1759999990463 +/- 5.37786268260533
Measured from: -31.2720000743866
to: 12.9039999246597 [s; relative to TRIGTIME]
T50: 17.7760000228882 +/- 11.7732713357007
Measured from: -12.5839999914169
to: 5.19200003147125 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.516000032424927
to: 0.483999967575073 [s; relative to TRIGTIME]
Total Fluence
Measured from: -33.8160001039505
to: 15.2719999551773 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.160439 1.114146 0.517464 0.085480
0.119683 0.107074 0.086505 0.073024 [error]
Peak 0.075473 0.090092 0.019603 0.008628
0.017862 0.016394 0.012618 0.010474 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 49.088 -33.816 15.272
T90 44.176 -31.272 12.904
T50 17.776 -12.584 5.192
Peak 1.000 -0.516 0.484
====== 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 -2.220 -0.217 0.204 - - - 3.52e-03 -4.85e-04 4.73e-04 48.630 57
CPL -1.548 -0.454 1.066 29.079 -27.749 15.475 8.37e-03 -8.37e-03 2.47e-02 46.880 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 -2.280 -0.433 0.379 - - - 1.05e-02 -3.18e-03 3.08e-03 60.410 57
CPL 0.433 -2.175 5.093 34.580 -24.394 11.202 4.53e-01 -4.53e-01 7.46e+02 56.080 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 4.36e-07 5.18e-07 4.45e-07 6.51e-07 1.63e-06 2.05e-06 erg/cm2
90%_error_low -6.84e-08 -5.65e-08 -8.24e-08 -2.12e-07 -1.94e-07 -3.17e-07 erg/cm2
90%_error_hi 7.09e-08 5.64e-08 8.37e-08 2.69e-07 1.96e-07 3.53e-07 erg/cm2
Peak flux PL 9.22e-01 5.87e-01 2.42e-01 1.35e-01 1.82e+00 1.89e+00 ph/cm2/s
90%_error_low -2.92e-01 -1.44e-01 -8.87e-02 -7.40e-02 -4.54e-01 -4.64e-01 ph/cm2/s
90%_error_hi 3.11e-01 1.44e-01 9.14e-02 1.09e-01 4.56e-01 4.65e-01 ph/cm2/s
Fluence CPL 4.04e-07 5.57e-07 4.39e-07 2.42e-07 1.55e-06 1.64e-06 erg/cm2
90%_error_low -8.14e-08 -7.34e-08 -9.57e-08 -1.72e-07 -2.12e-07 -2.85e-07 erg/cm2
90%_error_hi 8.06e-08 7.76e-08 9.19e-08 5.16e-07 2.20e-07 5.31e-07 erg/cm2
Peak flux CPL 7.33e-01 7.86e-01 1.95e-01 6.05e-03 1.72e+00 1.72e+00 ph/cm2/s
90%_error_low -3.45e-01 -2.20e-01 -1.95e-01 -6.05e-03 -4.58e-01 -4.59e-01 ph/cm2/s
90%_error_hi 3.58e-01 2.29e-01 1.40e-01 8.07e-02 4.64e-01 4.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 227.4310 -6.2737 0.0147 46.8952 -5.8255 2.9981924 13.068 TRIG_01061482 Foreground time interval of the image: -33.816 15.272 (delta_t = 49.088 [sec]) Background time interval of the image: -239.672 -33.816 (delta_t = 205.856 [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 -33.816 sec. to 15.272 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.22024 ( -0.216689 0.203727 ) Norm@50keV : 3.52018E-03 ( -0.000485273 0.000473224 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.63 using 59 bins. Reduced chi-squared = 0.853158 # Null hypothesis probability of 7.77e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 49.09 sec: 0.589110 ( -0.066183 0.066387 ) ph/cm2/s Energy fluence (15-150 keV) : 1.62983e-06 ( -1.94134e-07 1.96304e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.816 sec. to 15.272 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54842 ( -0.453609 1.06609 ) Epeak [keV] : 29.0786 ( -27.7491 15.4754 ) Norm@50keV : 8.37193E-03 ( -0.00837194 0.0247397 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 46.88 using 59 bins. Reduced chi-squared = 0.837143 # Null hypothesis probability of 8.02e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 49.09 sec: 0.571339 ( -0.070325 0.070185 ) ph/cm2/s Energy fluence (15-150 keV) : 1.55036e-06 ( -2.12463e-07 2.19516e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.516 sec. to 0.484 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.28046 ( -0.432577 0.379963 ) Norm@50keV : 1.05175E-02 ( -0.0031781 0.00308379 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 60.41 using 59 bins. Reduced chi-squared = 1.05982 # Null hypothesis probability of 3.54e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.81856 ( -0.45436 0.45598 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00166e-07 ( -2.62259e-08 2.66547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.516 sec. to 0.484 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.433023 ( -2.20821 5.06036 ) Epeak [keV] : 34.5804 ( -24.5073 11.0889 ) Norm@50keV : 0.452898 ( -0.622963 745.547 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.08 using 59 bins. Reduced chi-squared = 1.00143 # Null hypothesis probability of 4.72e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.72063 ( -0.45846 0.46389 ) ph/cm2/s Energy fluence (15-150 keV) : 8.73957e-08 ( -2.41822e-08 2.77108e-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 = 1.062925553726042E+00, IMY = 1.084459794156913E-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: -239.672000 -33.816000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4805 -60.5606 16.7 40.3 -115.6 0.5403 0.7 6.1 Cen X-3 186.6619 -62.7708 0.4 32.3 -116.2 14.7124 29.6 0.1 GX 301-2 244.9798 -15.6365 0.9 35.4 18.6 6.2839 13.6 0.2 Sco X-1 255.9934 -37.7963 2.6 15.6 54.0 1.5162 4.4 2.9 4U 1700-377 256.1860 -36.3546 0.0 16.9 52.1 0.7956 2.2 12.7 GX 349+2 263.1885 -24.7970 7.5 29.9 53.5 0.6785 1.5 10.3 GX 1+4 264.8100 -44.2473 0.0 15.3 89.3 -0.4199 -1.1 12.5 4U 1735-44 270.0544 -25.0481 0.0 32.6 64.4 0.6443 1.3 12.6 GX 5-1 270.3003 -25.6954 5.4 32.1 65.4 1.0734 2.1 2.9 GRS 1758-258 275.9252 -30.3669 166.3 31.2 78.2 -0.0352 -0.1 0.0 H1820-303 263.0552 -33.6439 0.0 22.1 62.8 0.4129 1.1 11.9 GX 354-0 232.7837 -41.9412 2.5 12.0 -28.1 1.4649 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -33.816000 15.272000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1716 -60.7322 7.3 40.4 -115.9 0.4896 1.6 7.8 Cen X-3 186.7443 -62.7762 1.7 32.3 -116.2 1.1113 6.6 2.4 GX 301-2 245.0167 -15.5189 6.2 35.5 18.6 -0.3240 -1.9 7.6 Sco X-1 255.8993 -38.0370 0.0 15.3 54.2 -0.2049 -1.6 12.3 4U 1700-377 256.2075 -36.3886 4.9 16.9 52.2 -0.3014 -2.3 11.2 GX 349+2 262.8108 -24.7314 5.9 29.9 52.8 -0.3235 -1.9 10.8 GX 1+4 264.9266 -44.5378 32.8 15.2 90.4 0.0435 0.4 9.5 4U 1735-44 270.4484 -25.1441 3.5 32.7 65.1 0.6909 3.3 9.7 GX 5-1 270.2413 -25.6671 6.6 32.1 65.3 -0.3632 -1.8 5.6 GRS 1758-258 275.7939 -30.4356 5.0 31.1 78.2 0.4820 2.3 7.9 H1820-303 262.9349 -33.7608 10.6 21.9 62.8 -0.1584 -1.1 5.2 GX 354-0 348.6593 -59.4259 2.2 53.8 159.9 2.9969 5.1 ------ UNKNOWN 227.4315 -6.2740 0.9 46.9 -5.8 3.0003 13.1 ------ UNKNOWN 148.9744 -80.2594 2.4 40.9 -147.6 0.8115 4.9 ------ UNKNOWN 84.6793 -68.5182 2.1 59.5 -154.0 4.0029 5.5 ------ UNKNOWN 117.8697 -68.5602 2.9 54.1 -141.2 2.4584 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 103.828630 511.828640 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9876 -15.6305 0.5 19.6 101.4 13.2327 23.5 0.7 Sco X-1 254.4651 35.3047 6.0 48.8 11.0 1.9944 1.9 2.3 Her X-1 256.1377 -37.7843 5.0 40.9 126.0 3.8624 2.3 8.0 4U 1700-377 256.3739 -36.5464 6.4 40.2 124.4 2.7512 1.8 8.0 GX 349+2 263.1132 -24.6991 5.0 38.8 103.7 3.0136 2.3 6.3 GX 1+4 258.5219 1.6126 3.2 32.0 58.2 2.7204 3.6 ------ UNKNOWN 236.3008 -28.0922 3.2 23.4 141.4 2.0466 3.6 ------ UNKNOWN 231.9703 16.1558 3.2 22.9 -7.2 1.6351 3.6 ------ UNKNOWN 195.8312 -30.0657 2.8 38.0 -151.2 2.8239 4.1 ------ UNKNOWN 215.9630 50.3761 3.6 57.5 -27.2 10.4079 3.2 ------ UNKNOWN 195.9317 26.4934 3.3 44.8 -60.1 8.0293 3.5 ------ UNKNOWN