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: Thu Aug 15 13:43:55 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger915381
======================================================================
Trigger: 00915381 Segment: 000
BAT Trigger Time: 585241137.664 [s; MET]
Trigger Stop: 585241138.688 [s; MET]
UTC: 2019-07-19T14:58:34.397080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 240.210492923109 Dec: 12.9774518761248 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.62
Image Trigger?: NO
Rate S/N Ratio: 62.3377895020348 [ if not an image trigger ]
Image S/N Ratio: 18.62
Analysis Position: [ source = BAT ]
RA: 240.210492923109 Dec: 12.9774518761248 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 240.207178641202 Dec: 13.0080713243865 [deg; J2000]
{ 16h 00m 49.7s , +13d 00' 29.1" }
+/- 1.2820748256695 [arcmin] (estimated 90% radius based on SNR)
+/- 0.481934229010554 [arcmin] (formal 1-sigma fit error)
SNR: 21.3283087547231
Angular difference between the analysis and refined position is 1.847357 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 185.827999949455 +/- 9.59720388569659
Measured from: 0.620000004768372
to: 186.447999954224 [s; relative to TRIGTIME]
T50: 99.5199999809265 +/- 6.17293445866476
Measured from: 58.8359999656677
to: 158.355999946594 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.26800000667572
to: 1.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.28000009059906
to: 202.12399995327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.871185 3.333348 2.269811 0.422877
0.119784 0.122823 0.116945 0.126196 [error]
Peak 0.180957 0.273823 0.207818 0.056207
0.011438 0.012980 0.012113 0.010000 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 202.404 -0.280 202.124
T90 185.828 0.620 186.448
T50 99.520 58.836 158.356
Peak 1.000 0.268 1.268
====== 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 -1.665 -0.089 0.088 - - - 2.71e-03 -1.31e-04 1.30e-04 62.500 57
CPL -1.459 -0.272 0.359 123.346 -51.024 -123.346 3.47e-03 -8.57e-04 1.82e-03 61.390 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 -1.389 -0.098 0.097 - - - 4.53e-02 -2.55e-03 2.54e-03 46.380 57
CPL -1.063 -0.359 0.405 142.814 -53.968 -142.814 6.63e-02 -2.18e-02 3.92e-02 44.120 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 8.18e-07 1.36e-06 1.71e-06 4.31e-06 5.09e-06 8.20e-06 erg/cm2
90%_error_low -6.27e-08 -6.16e-08 -1.16e-07 -6.00e-07 -2.64e-07 -6.95e-07 erg/cm2
90%_error_hi 6.44e-08 6.16e-08 1.16e-07 6.67e-07 2.67e-07 7.51e-07 erg/cm2
Peak flux PL 1.67e+00 1.80e+00 1.37e+00 1.71e+00 5.50e+00 6.56e+00 ph/cm2/s
90%_error_low -1.60e-01 -1.06e-01 -9.78e-02 -2.40e-01 -3.04e-01 -3.78e-01 ph/cm2/s
90%_error_hi 1.64e-01 1.06e-01 9.74e-02 2.64e-01 3.04e-01 3.81e-01 ph/cm2/s
Fluence CPL 7.91e-07 1.38e-06 1.72e-06 3.02e-06 4.97e-06 6.91e-06 erg/cm2
90%_error_low -7.54e-08 -7.33e-08 -1.19e-07 -1.26e-06 -3.27e-07 -1.31e-06 erg/cm2
90%_error_hi 7.66e-08 7.45e-08 1.20e-07 1.46e-06 3.29e-07 1.55e-06 erg/cm2
Peak flux CPL 1.58e+00 1.86e+00 1.41e+00 1.15e+00 5.41e+00 6.00e+00 ph/cm2/s
90%_error_low -1.90e-01 -1.24e-01 -1.06e-01 -4.08e-01 -3.18e-01 -5.29e-01 ph/cm2/s
90%_error_hi 1.93e-01 1.27e-01 1.08e-01 6.45e-01 3.18e-01 7.20e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 240.2072 13.0081 0.0090 12.2229 -34.0132 1.6588231 21.328 TRIG_00915381 Foreground time interval of the image: -0.280 17.037 (delta_t = 17.317 [sec]) Background time interval of the image: -102.363 -0.280 (delta_t = 102.083 [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 -0.280 sec. to 202.124 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66537 ( -0.0890782 0.0881746 ) Norm@50keV : 2.70810E-03 ( -0.000131142 0.000130313 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.50 using 59 PHA bins. # Reduced chi-squared = 1.097 for 57 degrees of freedom # Null hypothesis probability = 2.871130e-01 Photon flux (15-150 keV) in 202.4 sec: 0.355438 ( -0.016128 0.01615 ) ph/cm2/s Energy fluence (15-150 keV) : 5.09085e-06 ( -2.64033e-07 2.66757e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.280 sec. to 202.124 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45876 ( -0.271551 0.35865 ) Epeak [keV] : 123.346 ( -51.0243 -123.346 ) Norm@50keV : 3.46925E-03 ( -0.000857486 0.00181768 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.39 using 59 PHA bins. # Reduced chi-squared = 1.096 for 56 degrees of freedom # Null hypothesis probability = 2.889028e-01 Photon flux (15-150 keV) in 202.4 sec: 0.350236 ( -0.018091 0.01808 ) ph/cm2/s Energy fluence (15-150 keV) : 4.96764e-06 ( -3.2719e-07 3.28631e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.268 sec. to 1.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38902 ( -0.0976764 0.0971697 ) Norm@50keV : 4.52520E-02 ( -0.00254767 0.00254035 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.38 using 59 PHA bins. # Reduced chi-squared = 0.8136 for 57 degrees of freedom # Null hypothesis probability = 8.415539e-01 Photon flux (15-150 keV) in 1 sec: 5.49736 ( -0.30398 0.30412 ) ph/cm2/s Energy fluence (15-150 keV) : 4.38299e-07 ( -2.79532e-08 2.81777e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06335 ( -0.359254 0.405416 ) Epeak [keV] : 142.814 ( -53.9698 -142.816 ) Norm@50keV : 6.62738E-02 ( -0.0218284 0.039179 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.12 using 59 PHA bins. # Reduced chi-squared = 0.7879 for 56 degrees of freedom # Null hypothesis probability = 8.747406e-01 Photon flux (15-150 keV) in 1 sec: 5.41428 ( -0.31834 0.31796 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 185.828 sec. Hardness ratio (energy fluence ratio) = 1.26110117141
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.1757328e-06 S(50-150 keV) = 2.915136e-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 = 1.795632528918745E-01, IMY = 1.211770814712049E-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: -102.363410 -0.280000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9662 -15.6911 2.0 16.9 144.8 2.3842 5.9 3.2 Sco X-1 254.4938 35.1576 0.0 36.1 -8.1 0.2004 0.4 11.2 Her X-1 256.1951 -37.7462 43.3 40.8 137.3 -0.4732 -0.3 11.5 4U 1700-377 256.3632 -36.5098 100.5 39.7 136.4 -0.1867 -0.1 6.3 GX 349+2 262.9637 -24.8117 4.6 32.7 117.8 2.0664 2.5 4.7 GX 1+4 268.4502 -1.6363 40.5 26.5 70.1 0.1697 0.3 12.1 SW J1753.5-0127 270.3529 -24.9685 7.5 37.7 109.9 2.1471 1.5 7.6 GX 5-1 270.4686 -25.7654 11.0 38.3 110.8 1.6594 1.0 9.1 GRS 1758-258 273.8147 -14.0957 0.0 34.9 91.2 2.3792 2.3 11.7 GX 17+2 263.1578 -33.7322 2.6 39.9 126.7 8.0963 4.4 10.4 GX 354-0 227.4820 -47.6256 2.4 50.2 167.3 8.6383 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.280000 17.036600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8056 -15.6502 10.9 16.8 145.3 -0.0948 -1.1 10.1 Sco X-1 254.4278 35.4497 4.0 36.4 -8.4 0.3091 2.9 6.6 Her X-1 256.1785 -37.8408 6.4 40.9 137.4 0.5706 1.8 9.1 4U 1700-377 256.2465 -36.5147 3.8 39.7 136.6 0.8814 3.1 10.6 GX 349+2 263.0700 -24.7479 13.1 32.8 117.5 -0.1525 -0.9 3.3 GX 1+4 268.3067 -1.5743 12.0 26.4 70.0 -0.1331 -1.0 8.2 SW J1753.5-0127 270.3427 -24.9661 12.8 37.7 109.9 -0.2486 -0.9 7.5 GX 5-1 270.1275 -25.7392 9.8 38.0 111.1 0.3498 1.2 9.5 GRS 1758-258 274.0471 -13.9201 5.1 35.0 90.8 -0.5331 -2.3 7.4 GX 17+2 263.2280 -33.7442 0.0 40.0 126.7 -0.4359 -1.3 13.1 GX 354-0 285.8752 31.0084 2.6 51.2 24.1 1.5806 4.4 ------ UNKNOWN 231.8768 -46.9741 2.3 48.7 163.8 1.5114 5.0 ------ UNKNOWN 243.6319 9.1884 2.2 8.4 -14.8 0.4002 5.2 ------ UNKNOWN 240.2072 13.0081 0.5 12.2 -34.0 1.6588 21.3 ------ UNKNOWN 193.0182 -15.1886 2.4 51.1 -135.9 1.8048 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 49.836600 856.336600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9743 -15.6571 1.7 29.0 140.9 25.9920 6.5 1.1 Sco X-1 254.4577 35.3426 2700.0 25.8 -2.1 0.0078 0.0 0.0 Her X-1 268.3360 -1.4888 5.1 31.4 85.8 -12.1491 -2.3 2.9 SW J1753.5-0127 273.1820 -5.7975 3.5 37.7 88.2 26.3682 3.3 ------ UNKNOWN 213.6771 20.1050 2.6 26.4 -100.4 12.6919 4.5 ------ UNKNOWN 196.7136 17.8213 2.3 42.1 -107.3 52.2074 5.1 ------ UNKNOWN