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 15:05:11 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger970886
======================================================================
Trigger: 00970886 Segment: 000
BAT Trigger Time: 610699662.336 [s; MET]
Trigger Stop: 610699666.432 [s; MET]
UTC: 2020-05-09T06:47:17.426340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 116.449929380473 Dec: -4.64135929017309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 13.1529464379659 [ if not an image trigger ]
Image S/N Ratio: 10.2
Analysis Position: [ source = BAT ]
RA: 116.449929380473 Dec: -4.64135929017309 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 116.414946348068 Dec: -4.63401519229606 [deg; J2000]
{ 07h 45m 39.6s , -04d 38' 02.5" }
+/- 1.70519975245069 [arcmin] (estimated 90% radius based on SNR)
+/- 0.802992935622336 [arcmin] (formal 1-sigma fit error)
SNR: 14.1909302149057
Angular difference between the analysis and refined position is 2.138011 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 828.227999925613 +/- 13.3825565010765
Measured from: 3.36400008201599
to: 831.592000007629 [s; relative to TRIGTIME]
T50: 607.999999880791 +/- 209.406043122585
Measured from: 206.236000061035
to: 814.235999941826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 822.692000031471
to: 823.692000031471 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.796000003814697
to: 848.991999983788 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.081621 4.197761 3.242221 0.845820
0.180387 0.187450 0.166827 0.152894 [error]
Peak 0.064290 0.049961 0.039725 0.013032
0.006603 0.006943 0.006016 0.005086 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 849.788 -0.796 848.992
T90 828.228 3.364 831.592
T50 608.000 206.236 814.236
Peak 1.000 822.692 823.692
====== 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 -1.512 -0.092 0.091 - - - 8.54e-04 -4.41e-05 4.40e-05 42.000 57
CPL -1.186 -0.351 0.382 124.898 -42.720 -124.898 1.24e-03 -4.02e-04 6.72e-04 39.510 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 -1.826 -0.260 0.243 - - - 9.08e-03 -1.44e-03 1.39e-03 47.320 57
CPL -2.059 -0.181 0.685 24.828 N/A N/A 6.83e-03 N/A N/A 46.820 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 9.37e-07 1.71e-06 2.40e-06 7.04e-06 6.87e-06 1.21e-05 erg/cm2
90%_error_low -8.26e-08 -9.14e-08 -1.62e-07 -9.84e-07 -3.88e-07 -1.11e-06 erg/cm2
90%_error_hi 8.48e-08 9.12e-08 1.62e-07 1.09e-06 3.91e-07 1.20e-06 erg/cm2
Peak flux PL 5.11e-01 4.25e-01 2.40e-01 2.00e-01 1.26e+00 1.38e+00 ph/cm2/s
90%_error_low -9.78e-02 -5.35e-02 -5.05e-02 -7.25e-02 -1.59e-01 -1.77e-01 ph/cm2/s
90%_error_hi 1.02e-01 5.35e-02 5.04e-02 9.36e-02 1.59e-01 1.79e-01 ph/cm2/s
Fluence CPL 8.85e-07 1.76e-06 2.44e-06 4.30e-06 6.68e-06 9.38e-06 erg/cm2
90%_error_low -9.92e-08 -1.08e-07 -1.72e-07 -1.68e-06 -4.42e-07 -1.73e-06 erg/cm2
90%_error_hi 1.01e-07 1.10e-07 1.74e-07 3.02e-06 4.41e-07 3.04e-06 erg/cm2
Peak flux CPL 5.16e-01 4.23e-01 2.38e-01 2.01e-01 1.26e+00 1.38e+00 ph/cm2/s
90%_error_low -1.03e-01 N/A N/A -7.14e-02 -1.59e-01 -2.00e-01 ph/cm2/s
90%_error_hi 1.05e-01 N/A N/A 9.14e-02 1.59e-01 1.74e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 116.4149 -4.6340 0.0136 46.5133 -171.0355 2.1330344 14.191 TRIG_00970886 Foreground time interval of the image: -0.796 39.965 (delta_t = 40.761 [sec]) Background time interval of the image: -239.336 -0.796 (delta_t = 238.540 [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 -0.796 sec. to 848.992 sec. XSPEC12>exit XSPEC: quit Photon index: -1.5117 ( -0.0917008 0.0913393 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.51170 ( -0.0913393 0.0917008 ) Norm@50keV : 8.53962E-04 ( -4.4143e-05 4.40329e-05 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 849.8 sec: 0.106950 ( -0.005556 0.005563 ) ph/cm2/s Energy fluence (15-150 keV) : 6.87221e-06 ( -3.88308e-07 3.90798e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.796 sec. to 848.992 sec. XSPEC: quit Photon index: -1.18648 ( -0.351304 0.382472 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.18648 ( -0.382472 0.351304 ) Epeak [keV] : 124.898 ( -42.7204 -124.898 ) Norm@50keV : 1.24433E-03 ( -0.000401619 0.00067245 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 849.8 sec: 0.105032 ( -0.0059234 0.005921 ) ph/cm2/s Energy fluence (15-150 keV) : 6.68031e-06 ( -4.41574e-07 4.4111e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 822.692 sec. to 823.692 sec. XSPEC12>exit XSPEC: quit Photon index: -1.82604 ( -0.260085 0.243149 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.82604 ( -0.243149 0.260085 ) Norm@50keV : 9.07916E-03 ( -0.00144488 0.00138654 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 1.26401 ( -0.15936 0.15938 ) ph/cm2/s Energy fluence (15-150 keV) : 8.35314e-08 ( -1.31302e-08 1.34146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 822.692 sec. to 823.692 sec. XSPEC: quit Photon index: -2.18577 ( -0.0533727 0.811955 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.18577 ( -0.811955 0.0533727 ) Epeak [keV] : 73.1238 ( ) Norm@50keV : 5.95765E-03 ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 1.26400 ( -0.15915 0.1593 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 828.228 sec. Hardness ratio (energy fluence ratio) = 1.40281350647
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.6461196e-06 S(50-150 keV) = 4.226105e-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 = -1.041394159813912E+00, IMY = 1.642787071514176E-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 -0.796000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 159.4542 56.3866 2.8 24.3 21.2 0.9667 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.796000 39.964590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 178.5205 26.9259 2.2 39.2 79.3 1.6334 5.2 ------ UNKNOWN 160.2602 20.2422 1.8 29.7 106.8 0.8031 6.5 ------ UNKNOWN 234.5574 74.7139 2.3 55.3 3.4 2.0756 5.1 ------ UNKNOWN 116.4150 -4.6340 0.8 46.5 -171.0 2.1329 14.2 ------ UNKNOWN 113.0757 -8.8286 2.1 51.6 -168.7 1.1000 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 103.564590 962.695500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6420 22.0442 0.9 41.8 -68.8 32.3780 13.2 1.8 Crab 135.7697 -40.4341 0.0 39.8 137.0 2.4381 1.5 13.2 Vela X-1 155.1002 19.8850 2.9 45.2 36.0 6.7025 3.9 ------ UNKNOWN 116.4361 -4.6201 0.8 0.0 -89.7 9.5437 14.8 ------ UNKNOWN 114.5282 20.1132 4.7 24.8 -24.2 1.6826 2.5 ------ UNKNOWN 123.1386 42.9233 2.9 47.9 -13.3 4.9637 4.0 ------ UNKNOWN 65.5489 -29.5584 2.5 54.1 -143.4 15.2471 4.6 ------ UNKNOWN