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 13:40:54 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger916733
======================================================================
Trigger: 00916733 Segment: 000
BAT Trigger Time: 585951520.332 [s; MET]
Trigger Stop: 585951520.396 [s; MET]
UTC: 2019-07-27T20:18:17.019680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 126.480723836389 Dec: -13.2677573048208 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: NO
Rate S/N Ratio: 11.7046999107196 [ if not an image trigger ]
Image S/N Ratio: 7.74
Analysis Position: [ source = BAT ]
RA: 126.480723836389 Dec: -13.2677573048208 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 126.499429134113 Dec: -13.2722450683654 [deg; J2000]
{ 08h 25m 59.9s , -13d 16' 20.1" }
+/- 0.654543533499944 [arcmin] (estimated 90% radius based on SNR)
+/- 0.174941812807845 [arcmin] (formal 1-sigma fit error)
SNR: 55.7267002158184
Angular difference between the analysis and refined position is 1.125049 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 39.1959999799728 +/- 1.31134127710442
Measured from: -17.7640000581741
to: 21.4319999217987 [s; relative to TRIGTIME]
T50: 12.8399999141693 +/- 0.175727075310714
Measured from: 0.636000037193298
to: 13.4759999513626 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.13199996948242
to: 2.13199996948242 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.4880000352859
to: 38.9559999704361 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.174098 10.107455 8.227209 2.341905
0.094058 0.105640 0.097163 0.073177 [error]
Peak 0.556972 0.959297 0.889451 0.273219
0.020702 0.025931 0.026721 0.020442 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 60.444 -21.488 38.956
T90 39.196 -17.764 21.432
T50 12.840 0.636 13.476
Peak 1.000 1.132 2.132
====== 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 -1.413 -0.032 0.032 - - - 3.08e-02 -5.11e-04 5.10e-04 45.570 57
CPL -1.373 -0.052 0.089 946.008 -946.008 -946.008 3.21e-02 -1.61e-03 2.46e-03 45.930 56
=== 1-s peak 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 -1.195 -0.058 0.058 - - - 1.81e-01 -5.78e-03 5.78e-03 60.410 57
CPL -1.033 -0.185 0.225 330.700 -330.700 -330.700 2.15e-01 -3.72e-02 5.60e-02 58.750 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 2.20e-06 4.25e-06 6.39e-06 2.08e-05 1.80e-05 3.36e-05 erg/cm2
90%_error_low -8.11e-08 -9.11e-08 -1.15e-07 -8.94e-07 -2.93e-07 -9.24e-07 erg/cm2
90%_error_hi 8.25e-08 9.10e-08 1.15e-07 9.23e-07 2.93e-07 9.46e-07 erg/cm2
Peak flux PL 1.48e-03 1.76e-02 1.90e-01 2.32e+01 1.18e+00 2.26e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 2.11e-06 2.78e-06 2.81e-06 6.40e-06 9.16e-06 1.34e-05 erg/cm2
90%_error_low -1.40e-07 -1.15e-07 -1.29e-07 -2.81e-07 -4.34e-07 -6.16e-07 erg/cm2
90%_error_hi 8.24e-08 7.27e-08 9.64e-07 3.45e-07 3.36e-07 9.76e-07 erg/cm2
Peak flux CPL 5.36e+00 6.79e+00 5.98e+00 7.38e+00 2.11e+01 2.55e+01 ph/cm2/s
90%_error_low -4.42e-01 -2.71e-01 -2.58e-01 -1.53e+00 -7.34e-01 -1.73e+00 ph/cm2/s
90%_error_hi 4.49e-01 2.73e-01 2.60e-01 1.31e+00 7.34e-01 1.94e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 126.4994 -13.2722 0.0034 25.5290 -112.3006 27.7263436 55.727 TRIG_00916733 Foreground time interval of the image: -12.231 38.956 (delta_t = 51.187 [sec]) Background time interval of the image:
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 -21.488 sec. to 38.956 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41327 ( -0.0318548 0.0319564 ) Norm@50keV : 3.08494E-02 ( -0.000510722 0.000510004 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.57 using 59 PHA bins. # Reduced chi-squared = 0.7995 for 57 degrees of freedom # Null hypothesis probability = 8.616884e-01 Photon flux (15-150 keV) in 60.44 sec: 3.76843 ( -0.07377 0.07405 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79703e-05 ( -2.92615e-07 2.93256e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.488 sec. to 38.956 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40969 ( -0.0141818 0.126688 ) Epeak [keV] : 9999.09 ( -9999.1 -9999.1 ) Norm@50keV : 3.09563E-02 ( -0.000504379 0.00355817 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.58 using 59 PHA bins. # Reduced chi-squared = 0.8139 for 56 degrees of freedom # Null hypothesis probability = 8.387393e-01 Photon flux (15-150 keV) in 60.44 sec: 2.53015 ( -0.10746 0.06527 ) ph/cm2/s Energy fluence (15-150 keV) : 9.15575e-06 ( -4.34388e-07 3.36175e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.132 sec. to 2.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19458 ( -0.0582187 0.0582622 ) Norm@50keV : 0.181311 ( -0.00578164 0.00578162 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.41 using 59 PHA bins. # Reduced chi-squared = 1.060 for 57 degrees of freedom # Null hypothesis probability = 3.535866e-01 Photon flux (15-150 keV) in 1 sec: 1.17631 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.84251e-06 ( -6.62358e-08 6.642e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.132 sec. to 2.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03275 ( -0.184718 0.224545 ) Epeak [keV] : 330.700 ( -330.7 -330.7 ) Norm@50keV : 0.215302 ( -0.0371914 0.0559716 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.75 using 59 PHA bins. # Reduced chi-squared = 1.049 for 56 degrees of freedom # Null hypothesis probability = 3.750459e-01 Photon flux (15-150 keV) in 1 sec: 21.0901 ( -0.7338 0.7342 ) ph/cm2/s Energy fluence (15-150 keV) : 1.82402e-06 ( -7.11085e-08 7.08525e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 39.196 sec. Hardness ratio (energy fluence ratio) = 1.50186244279
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.448335e-06 S(50-150 keV) = 1.1522069e-05
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 = -1.812319746569528E-01, IMY = 4.418762016894605E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -12.231400 38.956000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5025 -40.5220 36.9 17.9 166.9 0.1371 0.3 2.3 Vela X-1 170.2151 -60.4526 100.5 36.4 112.9 0.1356 0.1 10.6 Cen X-3 114.6940 -67.3287 3.1 45.6 147.9 6.2873 3.7 ------ UNKNOWN 99.6584 -40.0894 2.2 43.1 -171.0 3.5685 5.2 ------ UNKNOWN 126.4994 -13.2722 0.2 25.5 -112.3 27.7262 55.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: -239.332000 711.105000 720.668000 839.564300 840.668000 962.801100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.2950 -40.4954 4.9 18.0 167.3 6.1040 2.3 11.2 Vela X-1 170.2525 -60.6069 11.7 36.5 113.0 -7.2970 -1.0 2.1 Cen X-3 178.3583 -62.0048 2.8 40.0 109.4 44.6135 4.2 ------ UNKNOWN 139.1349 -69.3552 4.1 42.9 135.3 40.1508 2.9 ------ UNKNOWN 126.5008 -13.2676 1.2 25.5 -112.3 29.8704 9.6 ------ UNKNOWN 154.3573 6.9904 2.8 34.2 -41.6 13.6824 4.1 ------ UNKNOWN 123.3578 -7.2384 2.3 31.7 -106.5 18.1941 4.9 ------ UNKNOWN