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 May 18 14:18:00 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger966554
======================================================================
Trigger: 00966554 Segment: 000
BAT Trigger Time: 608713541.952 [s; MET]
Trigger Stop: 608713542.464 [s; MET]
UTC: 2020-04-16T07:05:17.171400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.690709384972 Dec: -7.52998032721292 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.19
Image Trigger?: NO
Rate S/N Ratio: 21.6564078277077 [ if not an image trigger ]
Image S/N Ratio: 10.19
Analysis Position: [ source = BAT ]
RA: 335.690709384972 Dec: -7.52998032721292 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 335.693477989413 Dec: -7.52694426326541 [deg; J2000]
{ 22h 22m 46.4s , -07d 31' 37.0" }
+/- 1.33918172274151 [arcmin] (estimated 90% radius based on SNR)
+/- 0.424268143128861 [arcmin] (formal 1-sigma fit error)
SNR: 20.040985560328
Angular difference between the analysis and refined position is 0.245570 arcmin
Partial Coding Fraction: 0.3398438 [ including projection effects ]
Duration
T90: 6.04799997806549 +/- 0.978652094595659
Measured from: -1.80799996852875
to: 4.24000000953674 [s; relative to TRIGTIME]
T50: 3.18400013446808 +/- 0.609261909202546
Measured from: -0.0320000648498535
to: 3.15200006961823 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0279999971389771
to: 0.972000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.33599996566772
to: 4.95999991893768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.470313 0.561033 0.359884 0.147273
0.039258 0.041406 0.036024 0.030863 [error]
Peak 0.097966 0.179493 0.126429 0.020890
0.016564 0.017684 0.015912 0.011914 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.296 -2.336 4.960
T90 6.048 -1.808 4.240
T50 3.184 -0.032 3.152
Peak 1.000 -0.028 0.972
====== 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 -1.767 -0.147 0.145 - - - 1.41e-02 -1.23e-03 1.21e-03 57.140 57
CPL -1.765 -0.149 0.431 9999.210 -9999.200 -9999.210 1.41e-02 -6.98e-03 9.38e-03 57.140 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 -1.665 -0.206 0.200 - - - 2.86e-02 -3.64e-03 3.61e-03 43.790 57
CPL -1.047 -0.741 0.975 77.818 -19.775 -77.818 5.89e-02 -3.25e-02 1.21e-01 42.120 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 1.69e-07 2.63e-07 3.10e-07 7.04e-07 9.47e-07 1.45e-06 erg/cm2
90%_error_low -2.20e-08 -2.17e-08 -3.60e-08 -1.57e-07 -8.43e-08 -1.92e-07 erg/cm2
90%_error_hi 2.27e-08 2.16e-08 3.58e-08 1.84e-07 8.50e-08 2.12e-07 erg/cm2
Peak flux PL 1.38e+00 1.26e+00 7.94e-01 7.66e-01 3.75e+00 4.20e+00 ph/cm2/s
90%_error_low -2.68e-01 -1.62e-01 -1.26e-01 -2.17e-01 -4.71e-01 -5.11e-01 ph/cm2/s
90%_error_hi 2.83e-01 1.61e-01 1.24e-01 2.58e-01 4.73e-01 5.11e-01 ph/cm2/s
Fluence CPL 1.70e-07 2.62e-07 3.08e-07 7.02e-07 9.49e-07 1.45e-06 erg/cm2
90%_error_low N/A N/A -4.43e-08 N/A -9.16e-08 -3.78e-07 erg/cm2
90%_error_hi N/A N/A 4.63e-08 N/A 8.68e-08 1.95e-07 erg/cm2
Peak flux CPL 1.24e+00 1.34e+00 8.44e-01 4.19e-01 3.68e+00 3.84e+00 ph/cm2/s
90%_error_low -3.22e-01 -1.93e-01 -1.44e-01 -2.35e-01 -4.83e-01 -5.58e-01 ph/cm2/s
90%_error_hi 3.36e-01 2.01e-01 1.50e-01 4.46e-01 4.84e-01 6.78e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 335.6935 -7.5269 0.0096 47.0631 -168.2027 1.6086980 20.041 TRIG_00966554 Foreground time interval of the image: -2.336 4.960 (delta_t = 7.296 [sec]) Background time interval of the image: -216.851 -2.336 (delta_t = 214.515 [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 -2.336 sec. to 4.960 sec. XSPEC12>exit XSPEC: quit Photon index: -1.76692 ( -0.147398 0.144546 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.76692 ( -0.144546 0.147398 ) Norm@50keV : 1.40791E-02 ( -0.00122581 0.00121254 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 7.296 sec: 1.91584 ( -0.15987 0.16023 ) ph/cm2/s Energy fluence (15-150 keV) : 9.47123e-07 ( -8.43337e-08 8.49605e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.336 sec. to 4.960 sec. XSPEC: quit Photon index: -1.76479 ( -0.149171 0.431013 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.76479 ( -0.431013 0.149171 ) Epeak [keV] : 9999.21 ( -9999.35 -9999.36 ) Norm@50keV : 1.41110E-02 ( -0.00697438 0.00938523 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 7.296 sec: 1.91925 ( -0.1711 0.16444 ) ph/cm2/s Energy fluence (15-150 keV) : 9.49458e-07 ( -9.16006e-08 8.68166e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.028 sec. to 0.972 sec. XSPEC12>exit XSPEC: quit Photon index: -1.66542 ( -0.206484 0.200197 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.66542 ( -0.200197 0.206484 ) Norm@50keV : 2.86049E-02 ( -0.00364012 0.00360853 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 3.75446 ( -0.4715 0.4726 ) ph/cm2/s Energy fluence (15-150 keV) : 2.65675e-07 ( -3.52445e-08 3.54591e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.972 sec. XSPEC: quit Photon index: -1.04664 ( -0.741105 0.975007 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.04664 ( -0.975007 0.741105 ) Epeak [keV] : 77.8180 ( -19.7754 -77.818 ) Norm@50keV : 5.88622E-02 ( -0.0324648 0.120783 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 3.67676 ( -0.48319 0.48374 ) ph/cm2/s Energy fluence (15-150 keV) : 2.58131e-07 ( -3.72644e-08 3.71531e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 6.048 sec. Hardness ratio (energy fluence ratio) = 1.17535766918
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.319537e-07 S(50-150 keV) = 5.15175e-07
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 = -1.052036859068425E+00, IMY = 2.197308086859326E-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: -216.851410 -2.336000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 88.9907 -34.2591 3.3 58.3 -0.4 4.8892 3.6 ------ UNKNOWN 84.2391 -30.3213 3.1 56.7 -6.9 3.6739 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.336000 4.960000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 335.6935 -7.5269 0.6 47.1 -168.2 1.6087 20.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 83.748590 780.748600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5634 35.2096 6.2 54.7 163.4 6.7179 1.9 1.4 Cyg X-1 308.1724 41.0616 3.3 54.8 174.3 9.4346 3.5 7.1 Cyg X-3 326.1298 38.4057 4.5 46.8 -170.7 3.8111 2.6 5.4 Cyg X-2 309.1448 -11.7385 2.9 26.5 98.4 4.1604 4.0 ------ UNKNOWN 303.0076 37.7456 2.8 54.6 168.0 13.0934 4.1 ------ UNKNOWN 333.4291 -10.8890 3.7 4.0 53.2 1.8650 3.1 ------ UNKNOWN