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 v2.46
Process Start Time: Mon Jul 15 18:42:13 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger908329
======================================================================
Trigger: 00908329 Segment: 000
BAT Trigger Time: 582115645.12 [s; MET]
Trigger Stop: 582115646.144 [s; MET]
UTC: 2019-06-13T10:47:02.052640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 305.422149308421 Dec: -4.66387279817383 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.16
Image Trigger?: NO
Rate S/N Ratio: 31.8904374382039 [ if not an image trigger ]
Image S/N Ratio: 9.16
Analysis Position: [ source = BAT ]
RA: 305.422149308421 Dec: -4.66387279817383 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 305.437065736736 Dec: -4.65208286174333 [deg; J2000]
{ 20h 21m 44.9s , -04d 39' 07.5" }
+/- 1.96945160951666 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0589482476599 [arcmin] (formal 1-sigma fit error)
SNR: 11.5511460142017
Angular difference between the analysis and refined position is 1.138475 arcmin
Partial Coding Fraction: 0.1835938 [ including projection effects ]
Duration
T90: 160.819999933243 +/- 17.0842647385542
Measured from: -2.23199999332428
to: 158.587999939919 [s; relative to TRIGTIME]
T50: 119.759999990463 +/- 25.0265991761277
Measured from: -0.120000004768372
to: 119.639999985695 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0119999647140503
to: 1.01199996471405 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.84800004959106
to: 175.651999950409 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.017011 1.441225 0.866051 0.337596
0.150350 0.155411 0.141000 0.126658 [error]
Peak 0.138503 0.189149 0.252131 0.106932
0.024399 0.027960 0.028607 0.024651 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 178.500 -2.848 175.652
T90 160.820 -2.232 158.588
T50 119.760 -0.120 119.640
Peak 1.000 0.012 1.012
====== 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 -1.754 -0.248 0.237 - - - 1.32e-03 -1.92e-04 1.86e-04 81.590 57
CPL -1.752 -1.030 0.286 9999.360 N/A N/A 1.32e-03 N/A N/A 81.590 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 -1.254 -0.223 0.225 - - - 4.78e-02 -6.20e-03 6.19e-03 57.050 57
CPL -0.985 -0.469 1.102 199.050 -199.050 -199.050 6.46e-02 -6.25e-02 1.49e-01 56.810 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 3.81e-07 6.00e-07 7.12e-07 1.64e-06 2.17e-06 3.33e-06 erg/cm2
90%_error_low -7.45e-08 -7.49e-08 -1.42e-07 -5.92e-07 -3.22e-07 -7.39e-07 erg/cm2
90%_error_hi 7.75e-08 7.48e-08 1.42e-07 7.82e-07 3.28e-07 8.88e-07 erg/cm2
Peak flux PL 1.55e+00 1.81e+00 1.52e+00 2.15e+00 5.65e+00 7.03e+00 ph/cm2/s
90%_error_low -3.61e-01 -2.69e-01 -2.36e-01 -6.25e-01 -7.47e-01 -9.54e-01 ph/cm2/s
90%_error_hi 3.86e-01 2.64e-01 2.32e-01 7.67e-01 7.48e-01 9.72e-01 ph/cm2/s
Fluence CPL 3.60e-07 4.91e-07 4.45e-07 1.82e-06 2.19e-06 3.31e-06 erg/cm2
90%_error_low -9.23e-08 -1.13e-07 -1.86e-07 -8.74e-07 -4.59e-07 -1.02e-06 erg/cm2
90%_error_hi 6.94e-08 8.19e-08 1.16e-07 1.73e-07 1.42e-07 8.66e-07 erg/cm2
Peak flux CPL 1.47e+00 1.85e+00 1.56e+00 1.59e+00 5.60e+00 6.47e+00 ph/cm2/s
90%_error_low -4.54e-01 -3.00e-01 -2.68e-01 -9.83e-01 -7.75e-01 -1.32e+00 ph/cm2/s
90%_error_hi 4.47e-01 3.17e-01 2.84e-01 7.48e-01 7.71e-01 1.25e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 305.4371 -4.6521 0.0166 45.7069 31.6983 2.0634316 11.551 TRIG_00908329 Foreground time interval of the image: -2.848 12.381 (delta_t = 15.229 [sec]) Background time interval of the image: -239.120 -2.848 (delta_t = 236.272 [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 -2.848 sec. to 175.652 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7537 ( -0.248393 0.237381 ) Norm@50keV : 1.31706E-03 ( -0.000191791 0.000185893 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.59 using 59 PHA bins. # Reduced chi-squared = 1.431 for 57 degrees of freedom # Null hypothesis probability = 1.801042e-02 Photon flux (15-150 keV) in 178.5 sec: 0.178341 ( -0.022392 0.022419 ) ph/cm2/s Energy fluence (15-150 keV) : 2.16919e-06 ( -3.22392e-07 3.28101e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.848 sec. to 175.652 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.56892 ( -0.213964 1.10212 ) Epeak [keV] : 193.252 ( ) Norm@50keV : 5.11130E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 80.23 using 59 PHA bins. # Reduced chi-squared = 1.433 for 56 degrees of freedom # Null hypothesis probability = 1.854977e-02 Photon flux (15-150 keV) in 178.5 sec: 0.178649 ( -0.023029 0.022395 ) ph/cm2/s Energy fluence (15-150 keV) : 2.18791e-06 ( -4.59216e-07 1.4221e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.012 sec. to 1.012 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25388 ( -0.223429 0.225241 ) Norm@50keV : 4.77675E-02 ( -0.00619652 0.00618729 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.05 using 59 PHA bins. # Reduced chi-squared = 1.001 for 57 degrees of freedom # Null hypothesis probability = 4.731568e-01 Photon flux (15-150 keV) in 1 sec: 5.65323 ( -0.74676 0.74787 ) ph/cm2/s Energy fluence (15-150 keV) : 4.77617e-07 ( -6.91754e-08 6.98148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 1.012 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.984503 ( -0.469328 1.1018 ) Epeak [keV] : 199.050 ( -199.123 -199.123 ) Norm@50keV : 6.46208E-02 ( -0.0624564 0.148884 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.81 using 59 PHA bins. # Reduced chi-squared = 1.014 for 56 degrees of freedom # Null hypothesis probability = 4.447578e-01 Photon flux (15-150 keV) in 1 sec: 5.59812 ( -0.77509 0.77051 ) ph/cm2/s Energy fluence (15-150 keV) : 1.25254e-07 ( -6.71321e-08 3.31733e-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 = 8.720846365663342E-01, IMY = -5.385738319164157E-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: -239.120000 -2.848000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4162 35.2952 4.8 18.1 -174.7 -1.2544 -2.4 3.5 Her X-1 268.4469 -1.5420 9.6 33.2 88.7 -1.0691 -1.2 7.2 SW J1753.5-0127 288.6931 10.9263 3.7 23.5 41.5 1.7173 3.1 6.3 GRS 1915+105 299.6014 35.2068 0.9 20.6 -32.5 7.9547 13.5 0.6 Cyg X-1 308.1802 40.7617 5.7 28.1 -43.7 -1.4263 -2.0 11.9 Cyg X-3 326.3432 38.2743 7.9 42.0 -38.6 1.4626 1.5 8.6 Cyg X-2 240.0140 26.8018 2.1 31.2 167.2 3.7882 5.4 ------ UNKNOWN 331.7427 8.6370 2.7 56.8 -3.6 5.9998 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.848000 12.380600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4821 35.1988 10.5 18.0 -175.0 0.0643 1.1 8.7 Her X-1 268.5236 -1.3326 0.0 33.0 88.6 -0.1323 -0.9 11.8 SW J1753.5-0127 288.7239 11.0362 5.8 23.4 41.3 -0.1463 -2.0 7.0 GRS 1915+105 299.8137 35.2404 10.8 20.8 -32.5 0.0681 1.1 11.2 Cyg X-1 308.2628 41.0423 18.4 28.2 -44.3 0.0409 0.6 8.8 Cyg X-3 326.1708 38.3200 1136.9 41.9 -38.6 0.0010 0.0 0.1 Cyg X-2 305.4370 -4.6521 1.0 45.7 31.7 2.0625 11.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 85.980600 962.922000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 268.3648 -1.4402 39.1 37.1 122.0 -1.1550 -0.3 0.8 SW J1753.5-0127 270.3543 -25.0869 6.5 39.3 83.3 5.5277 1.8 3.8 GX 5-1 270.3413 -25.6117 7.1 39.6 82.6 -5.0591 -1.6 8.2 GRS 1758-258 274.0016 -14.1228 4.2 32.4 99.0 6.5128 2.7 5.2 GX 17+2 276.1352 -30.4198 8.4 37.7 71.7 4.0280 1.4 11.3 H1820-303 284.8916 -24.9900 12.8 28.3 70.3 -1.8726 -0.9 8.9 HT1900.1-2455 288.6617 10.9010 5.4 22.8 161.3 3.7781 2.1 8.5 GRS 1915+105 299.5763 35.1896 1.3 40.2 -159.2 28.2607 8.8 1.0 Cyg X-1 308.1719 40.9514 6.0 45.7 -148.9 8.3143 1.9 2.8 Cyg X-3 326.2894 38.2826 6.1 47.1 -129.4 17.2764 1.9 6.0 Cyg X-2 305.8205 -13.3250 2.5 8.7 25.6 8.7815 4.7 ------ UNKNOWN 339.3627 -44.3602 2.7 49.6 -3.4 13.5769 4.2 ------ UNKNOWN 341.3072 15.4164 2.3 40.8 -92.0 45.3781 5.0 ------ UNKNOWN