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: Wed Nov 27 12:14:09 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger929981
======================================================================
Trigger: 00929981 Segment: 000
BAT Trigger Time: 593015790.656 [s; MET]
Trigger Stop: 593015792.704 [s; MET]
UTC: 2019-10-17T14:36:06.891740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.150879225388 Dec: -73.5615431668346 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.63
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 8.63
Analysis Position: [ source = BAT ]
RA: 245.150879225388 Dec: -73.5615431668346 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 245.115163318261 Dec: -73.5852045015179 [deg; J2000]
{ 16h 20m 27.6s , -73d 35' 06.7" }
+/- 1.73384050928713 [arcmin] (estimated 90% radius based on SNR)
+/- 0.747374328400175 [arcmin] (formal 1-sigma fit error)
SNR: 13.8572401502003
Angular difference between the analysis and refined position is 1.543609 arcmin
Partial Coding Fraction: 0.4414062 [ including projection effects ]
Duration
T90: 4.32799994945526 +/- 0.571205655072513
Measured from: -0.920000076293945
to: 3.40799987316132 [s; relative to TRIGTIME]
T50: 2.03999996185303 +/- 0.574511995248431
Measured from: 0.379999995231628
to: 2.41999995708466 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.360000014305115
to: 1.36000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.30000007152557
to: 3.71599996089935 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.249010 0.337637 0.185427 0.027009
0.027363 0.029979 0.028782 0.031911 [error]
Peak 0.054590 0.090861 0.061598 0.021734
0.012424 0.013706 0.012813 0.014372 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.016 -1.300 3.716
T90 4.328 -0.920 3.408
T50 2.040 0.380 2.420
Peak 1.000 0.360 1.360
====== 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 -1.823 -0.208 0.199 - - - 1.05e-02 -1.40e-03 1.37e-03 58.100 57
CPL -1.411 -0.698 1.127 58.575 N/A N/A 1.83e-02 N/A N/A 57.520 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 -1.527 -0.315 0.307 - - - 1.54e-02 -2.92e-03 2.87e-03 52.050 57
CPL -1.035 -0.775 1.573 91.275 -42.557 -91.275 2.83e-02 -1.56e-02 1.68e-01 51.580 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 9.12e-08 1.38e-07 1.56e-07 3.35e-07 4.85e-07 7.19e-07 erg/cm2
90%_error_low -1.41e-08 -1.48e-08 -2.80e-08 -1.07e-07 -6.43e-08 -1.39e-07 erg/cm2
90%_error_hi 1.45e-08 1.48e-08 2.86e-08 1.38e-07 6.59e-08 1.64e-07 erg/cm2
Peak flux PL 6.50e-01 6.44e-01 4.47e-01 4.90e-01 1.94e+00 2.23e+00 ph/cm2/s
90%_error_low -1.81e-01 -1.18e-01 -1.08e-01 -2.02e-01 -3.44e-01 -4.06e-01 ph/cm2/s
90%_error_hi 1.93e-01 1.17e-01 1.07e-01 2.75e-01 3.44e-01 4.13e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -1.41e-08 -1.48e-08 -2.80e-08 -1.07e-07 -6.43e-08 -1.39e-07 erg/cm2
90%_error_hi 1.45e-08 1.48e-08 2.86e-08 1.38e-07 6.59e-08 1.64e-07 erg/cm2
Peak flux CPL 6.08e-01 6.80e-01 4.58e-01 2.64e-01 1.90e+00 2.01e+00 ph/cm2/s
90%_error_low -2.11e-01 -1.43e-01 -1.17e-01 -2.64e-01 -3.57e-01 -4.38e-01 ph/cm2/s
90%_error_hi 2.17e-01 1.57e-01 1.19e-01 2.96e-01 3.56e-01 5.10e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 245.1152 -73.5852 0.0139 38.2686 21.9084 0.8151612 13.857 TRIG_00929981 Foreground time interval of the image: -1.300 3.716 (delta_t = 5.016 [sec]) Background time interval of the image: -119.656 -1.300 (delta_t = 118.356 [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 -1.300 sec. to 3.716 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.82288 ( -0.207541 0.198498 ) Norm@50keV : 1.05037E-02 ( -0.00139685 0.00136576 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.10 using 59 PHA bins. # Reduced chi-squared = 1.019 for 57 degrees of freedom # Null hypothesis probability = 4.345418e-01 Photon flux (15-150 keV) in 5.016 sec: 1.46051 ( -0.1568 0.1568 ) ph/cm2/s Energy fluence (15-150 keV) : 4.84772e-07 ( -6.42705e-08 6.59313e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.300 sec. to 3.716 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41099 ( -0.698391 1.127 ) Epeak [keV] : 58.5753 ( ) Norm@50keV : 1.83154E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.52 using 59 PHA bins. # Reduced chi-squared = 1.027 for 56 degrees of freedom # Null hypothesis probability = 4.188452e-01 Photon flux (15-150 keV) in 5.016 sec: 1.43403 ( -0.16757 0.16685 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.360 sec. to 1.360 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52715 ( -0.315135 0.306831 ) Norm@50keV : 1.53925E-02 ( -0.00292396 0.00287179 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.05 using 59 PHA bins. # Reduced chi-squared = 0.9132 for 57 degrees of freedom # Null hypothesis probability = 6.608131e-01 Photon flux (15-150 keV) in 1 sec: 1.93601 ( -0.34385 0.34413 ) ph/cm2/s Energy fluence (15-150 keV) : 1.45415e-07 ( -2.98942e-08 3.06326e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.360 sec. to 1.360 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03503 ( -0.774769 1.57264 ) Epeak [keV] : 91.2752 ( -42.5651 -91.2829 ) Norm@50keV : 2.83011E-02 ( -0.015577 0.167962 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.58 using 59 PHA bins. # Reduced chi-squared = 0.9211 for 56 degrees of freedom # Null hypothesis probability = 6.426619e-01 Photon flux (15-150 keV) in 1 sec: 1.89874 ( -0.35715 0.35604 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38542e-07 ( -3.38099e-08 3.44954e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.328 sec. Hardness ratio (energy fluence ratio) = 1.13068088949
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.2882787e-07 S(50-150 keV) = 2.55952e-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 = 7.318926219078824E-01, IMY = -2.943437052745889E-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: -119.656000 -1.300000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.2988 -40.4761 0.0 26.7 145.0 -0.3506 -1.1 11.5 Vela X-1 170.4704 -60.4909 14.3 10.5 49.7 0.1925 0.8 9.1 Cen X-3 186.6555 -62.6569 7.1 15.2 20.0 0.4411 1.6 6.8 GX 301-2 255.9945 -37.8519 511.3 59.0 -18.7 0.0323 0.0 0.6 4U 1700-377 311.6498 -81.5158 3.6 46.8 40.5 2.4726 3.2 ------ UNKNOWN 141.9501 -22.8109 2.8 35.5 177.2 1.4052 4.2 ------ UNKNOWN 140.1404 -9.8381 2.3 47.6 -175.4 2.5439 4.9 ------ UNKNOWN 149.1241 -9.4315 2.6 44.5 -163.9 1.8616 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.300000 3.716000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3738 -40.4495 12.7 26.6 145.2 0.0402 0.9 9.5 Vela X-1 170.2862 -60.4217 24.1 10.4 50.2 -0.0171 -0.5 12.1 Cen X-3 186.2869 -62.7794 5.5 15.2 20.7 0.0739 2.1 10.2 GX 301-2 255.9147 -37.8594 3.9 58.9 -18.7 0.6804 2.9 3.5 4U 1700-377 245.1151 -73.5852 0.8 38.3 21.9 0.8152 13.9 ------ UNKNOWN 213.9228 -26.9444 2.6 39.9 -61.2 0.4237 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 87.444600 962.368700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5087 -40.4957 23.3 56.6 -164.6 -2.2072 -0.5 3.7 Vela X-1 170.5178 -60.6413 4.4 29.2 -148.2 3.2650 2.6 6.0 Cen X-3 186.4659 -62.6738 5.0 23.1 -137.1 2.4915 2.3 7.8 GX 301-2 256.2124 -37.8305 28.2 36.1 -28.8 -0.5416 -0.4 10.7 4U 1700-377 256.5470 -36.5135 8.2 37.4 -28.5 1.9896 1.4 7.6 GX 349+2 263.0805 -24.7252 6.6 49.8 -22.2 -4.5722 -1.7 4.1 GX 1+4 264.4745 -44.5263 0.0 30.3 -15.8 0.9718 0.9 12.4 4U 1735-44 270.3415 -25.0783 5.7 50.3 -13.6 4.3989 2.0 3.1 GX 5-1 270.3544 -25.6520 60.1 49.7 -13.5 0.4229 0.2 6.1 GRS 1758-258 275.7917 -30.3761 8.0 46.0 -6.0 -2.5135 -1.4 6.9 H1820-303 285.1525 -24.8190 4.2 53.2 3.1 -7.7005 -2.8 8.8 HT1900.1-2455 262.8923 -33.7417 6.3 40.8 -20.9 2.8529 1.8 7.4 GX 354-0 9.4894 -60.5373 3.9 40.9 97.9 13.9048 3.0 ------ UNKNOWN 32.2860 -68.9389 4.4 36.0 116.9 5.8778 2.6 ------ UNKNOWN 247.7355 -67.4546 3.7 6.1 -34.2 3.2191 3.1 ------ UNKNOWN 258.3288 -60.6947 3.8 13.8 -15.6 3.0777 3.0 ------ UNKNOWN 140.2982 -49.7746 3.9 46.7 -164.7 6.8515 2.9 ------ UNKNOWN 152.8548 -44.5618 3.3 48.3 -151.3 9.1426 3.5 ------ UNKNOWN 265.4774 -15.5773 2.9 59.1 -20.7 22.2519 4.1 ------ UNKNOWN