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 v2.47
Process Start Time: Mon Jun 29 14:53:54 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger974827
======================================================================
Trigger: 00974827 Segment: 000
BAT Trigger Time: 612354468.864 [s; MET]
Trigger Stop: 612354469.376 [s; MET]
UTC: 2020-05-28T10:27:23.846900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.636774868885 Dec: 58.1471189930449 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.17
Image Trigger?: NO
Rate S/N Ratio: 15.3948043183407 [ if not an image trigger ]
Image S/N Ratio: 9.17
Analysis Position: [ source = BAT ]
RA: 176.636774868885 Dec: 58.1471189930449 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 176.635874179899 Dec: 58.1849494187847 [deg; J2000]
{ 11h 46m 32.6s , +58d 11' 05.8" }
+/- 0.686444883629976 [arcmin] (estimated 90% radius based on SNR)
+/- 0.229830573673835 [arcmin] (formal 1-sigma fit error)
SNR: 52.064157854471
Angular difference between the analysis and refined position is 2.270005 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 59.9839999675751 +/- 1.92381702054219
Measured from: 4.74000000953674
to: 64.7239999771118 [s; relative to TRIGTIME]
T50: 24.6319999694824 +/- 0.417612353072037
Measured from: 28.0600000619888
to: 52.6920000314713 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.8159999847412
to: 34.8159999847412 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.73199999332428
to: 132.34399998188 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.531114 13.062307 6.699846 0.944570
0.091608 0.093892 0.077326 0.059484 [error]
Peak 0.607270 0.762010 0.512094 0.097064
0.013934 0.015551 0.013292 0.007421 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 133.076 -0.732 132.344
T90 59.984 4.740 64.724
T50 24.632 28.060 52.692
Peak 1.000 33.816 34.816
====== 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: CPL)
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 -2.100 -0.032 0.032 - - - 1.42e-02 -2.23e-04 2.23e-04 64.330 57
CPL -1.616 -0.139 0.143 43.143 -6.094 4.350 2.34e-02 -3.09e-03 3.67e-03 26.680 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.678 -0.049 0.049 - - - 1.24e-01 -3.36e-03 3.36e-03 54.660 57
CPL -1.173 -0.210 0.220 87.722 -11.939 25.083 2.15e-01 -4.27e-02 5.63e-02 36.870 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 4.24e-06 5.42e-06 5.06e-06 8.29e-06 1.75e-05 2.30e-05 erg/cm2
90%_error_low -1.40e-07 -1.02e-07 -9.94e-08 -3.68e-07 -2.78e-07 -4.27e-07 erg/cm2
90%_error_hi 1.42e-07 1.02e-07 9.91e-08 3.80e-07 2.78e-07 4.32e-07 erg/cm2
Peak flux PL 6.07e+00 5.50e+00 3.44e+00 3.28e+00 1.64e+01 1.83e+01 ph/cm2/s
90%_error_low -3.05e-01 -1.67e-01 -1.14e-01 -2.24e-01 -4.83e-01 -4.92e-01 ph/cm2/s
90%_error_hi 3.12e-01 1.66e-01 1.14e-01 2.34e-01 4.85e-01 4.92e-01 ph/cm2/s
Fluence CPL 3.73e-06 5.50e-06 5.21e-06 4.91e-06 1.68e-05 1.93e-05 erg/cm2
90%_error_low -1.89e-07 -1.07e-07 -1.11e-07 -6.23e-07 -3.33e-07 -7.44e-07 erg/cm2
90%_error_hi 1.93e-07 1.07e-07 1.11e-07 7.37e-07 3.33e-07 8.44e-07 erg/cm2
Peak flux CPL 5.38e+00 5.65e+00 3.60e+00 2.06e+00 1.58e+01 1.67e+01 ph/cm2/s
90%_error_low -3.96e-01 -1.82e-01 -1.34e-01 -3.46e-01 -5.30e-01 -6.78e-01 ph/cm2/s
90%_error_hi 4.05e-01 1.82e-01 1.35e-01 4.26e-01 5.33e-01 7.19e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 176.6359 58.1849 0.0037 27.6737 -131.8887 4.0130465 52.064 TRIG_00974827 Foreground time interval of the image: -0.732 10.637 (delta_t = 11.369 [sec]) Background time interval of the image: -239.864 -0.732 (delta_t = 239.132 [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 -0.732 sec. to 132.344 sec. XSPEC12>exit XSPEC: quit Photon index: -2.10012 ( -0.0316912 0.0316467 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.10012 ( -0.0316467 0.0316912 ) Norm@50keV : 1.41594E-02 ( -0.000223325 0.000223313 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 133.1 sec: 2.22797 ( -0.0479 0.04824 ) ph/cm2/s Energy fluence (15-150 keV) : 1.75137e-05 ( -2.78429e-07 2.78437e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 132.344 sec. XSPEC: quit Photon index: -1.61564 ( -0.139017 0.14307 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.61564 ( -0.14307 0.139017 ) Epeak [keV] : 43.1431 ( -6.09422 4.34973 ) Norm@50keV : 2.34425E-02 ( -0.00308822 0.00367097 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 133.1 sec: 2.09906 ( -0.05753 0.05822 ) ph/cm2/s Energy fluence (15-150 keV) : 1.68282e-05 ( -3.32634e-07 3.32589e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 33.816 sec. to 34.816 sec. XSPEC12>exit XSPEC: quit Photon index: -1.67787 ( -0.049271 0.0490161 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.67787 ( -0.0490161 0.049271 ) Norm@50keV : 0.124363 ( -0.0033584 0.00335639 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 16.3918 ( -0.4832 0.4846 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15375e-06 ( -3.2274e-08 3.23191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.816 sec. to 34.816 sec. XSPEC: quit Photon index: -1.17312 ( -0.210198 0.220288 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.17312 ( -0.220288 0.210198 ) Epeak [keV] : 87.7220 ( -11.9391 25.0829 ) Norm@50keV : 0.214595 ( -0.0426834 0.0563396 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 15.8069 ( -0.5302 0.5327 ) ph/cm2/s Energy fluence (15-150 keV) : 1.1183e-06 ( -3.56452e-08 3.55783e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 59.984 sec. Hardness ratio (energy fluence ratio) = 0.947785353973
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.224761e-06 S(50-150 keV) = 7.603281e-06
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 = -3.501517289823179E-01, IMY = 3.904046968426518E-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: -239.864000 -0.732000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4659 35.2841 10.6 27.2 61.8 0.3412 1.1 3.5 Her X-1 299.5775 35.2117 3.2 50.9 15.1 2.2155 3.6 0.9 Cyg X-1 308.1563 41.0460 9.7 51.3 3.7 0.6557 1.2 6.0 Cyg X-3 345.5676 58.7718 3.1 54.4 -33.1 4.7228 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.732000 10.636590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4576 35.1952 15.9 27.3 62.0 -0.0516 -0.7 8.8 Her X-1 299.3659 35.1754 23.7 50.8 15.3 0.0826 0.5 11.1 Cyg X-1 308.1655 41.0402 10.1 51.3 3.7 -0.1704 -1.2 5.8 Cyg X-3 225.1484 21.3604 4.1 35.0 118.3 0.3105 2.9 ------ UNKNOWN 179.8855 18.6741 2.8 52.4 176.8 0.7232 4.1 ------ UNKNOWN 176.6359 58.1850 0.2 27.7 -131.9 4.0132 52.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 59.036610 305.036600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 209.8364 36.2615 2.6 30.8 92.1 1.7106 4.4 ------ UNKNOWN 174.4737 5.8048 3.1 52.4 154.2 4.4689 3.8 ------ UNKNOWN 176.5161 58.1907 0.9 0.1 -97.1 2.8264 12.7 ------ UNKNOWN 161.3292 53.6801 2.7 9.7 -139.5 0.9887 4.2 ------ UNKNOWN 144.7173 17.7351 3.0 46.8 -164.7 2.0999 3.9 ------ UNKNOWN 134.5342 20.5968 3.0 48.3 -151.3 2.7289 3.8 ------ UNKNOWN 122.2743 29.0791 3.3 47.1 -132.4 3.7754 3.5 ------ UNKNOWN