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 Sep 11 18:36:21 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger769567
======================================================================
Trigger: 00769567 Segment: 000
BAT Trigger Time: 525503568 [s; MET]
Trigger Stop: 525503632 [s; MET]
UTC: 2017-08-27T05:12:28.408920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.180423079966 Dec: -40.2199088737139 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.28
Analysis Position: [ source = BAT ]
RA: 276.180423079966 Dec: -40.2199088737139 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 276.187297657535 Dec: -40.2016677144553 [deg; J2000]
{ 18h 24m 45.0s , -40d 12' 06.0" }
+/- 1.93522882742095 [arcmin] (estimated 90% radius based on SNR)
+/- 0.776011790423826 [arcmin] (formal 1-sigma fit error)
SNR: 11.8440647582515
Angular difference between the analysis and refined position is 1.138897 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 98.62399995327 +/- 31.7029847368173
Measured from: 24.1200000047684
to: 122.743999958038 [s; relative to TRIGTIME]
T50: 49.4599999189377 +/- 17.8073604147159
Measured from: 46.2360000014305
to: 95.6959999203682 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 67.1280000209808
to: 68.1280000209808 [s; relative to TRIGTIME]
Total Fluence
Measured from: 17.2400000095367
to: 176.972000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.701221 0.690663 0.825193 0.186330
0.087467 0.083154 0.071272 0.063822 [error]
Peak 0.021780 0.011548 0.020233 0.004836
0.007115 0.006574 0.005524 0.004817 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 159.732 17.240 176.972
T90 98.624 24.120 122.744
T50 49.460 46.236 95.696
Peak 1.000 67.128 68.128
====== 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 -1.215 -0.187 0.190 - - - 9.90e-04 -9.87e-05 9.86e-05 53.010 57
CPL -1.072 -0.318 0.718 370.107 -370.107 -370.107 1.15e-03 -5.00e-04 1.14e-03 53.040 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 -1.490 -0.823 0.803 - - - 3.42e-03 -1.32e-03 1.22e-03 58.140 57
CPL -1.537 -2.259 1.326 9999.350 N/A N/A 3.36e-03 N/A N/A 58.160 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 1.55e-07 3.39e-07 5.83e-07 2.33e-06 1.60e-06 3.40e-06 erg/cm2
90%_error_low -3.08e-08 -4.07e-08 -6.96e-08 -5.85e-07 -1.74e-07 -6.30e-07 erg/cm2
90%_error_hi 3.31e-08 4.00e-08 6.87e-08 7.18e-07 1.75e-07 7.42e-07 erg/cm2
Peak flux PL 1.39e-01 1.41e-01 1.00e-01 1.14e-01 4.26e-01 4.95e-01 ph/cm2/s
90%_error_low -8.78e-02 -6.06e-02 -5.07e-02 -8.58e-02 -1.56e-01 -1.75e-01 ph/cm2/s
90%_error_hi 1.08e-01 5.42e-02 4.60e-02 1.80e-01 1.56e-01 1.79e-01 ph/cm2/s
Fluence CPL 1.53e-07 3.40e-07 5.86e-07 2.16e-06 1.59e-06 2.96e-06 erg/cm2
90%_error_low -4.14e-08 -4.13e-08 -7.22e-08 -1.29e-06 -1.87e-07 -1.03e-06 erg/cm2
90%_error_hi 2.55e-08 4.31e-08 8.16e-08 3.08e-07 1.78e-07 1.08e-06 erg/cm2
Peak flux CPL 1.33e-01 9.40e-02 4.56e-02 3.73e-02 2.88e-01 3.10e-01 ph/cm2/s
90%_error_low -1.12e-01 -9.40e-02 -4.56e-02 -3.73e-02 N/A -3.10e-01 ph/cm2/s
90%_error_hi 1.10e-01 1.21e-01 3.25e-02 2.28e-02 N/A 2.67e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 276.1873 -40.2017 0.0162 18.3779 172.1066 1.3692927 11.844 TRIG_00769567 Foreground time interval of the image: 17.240 72.501 (delta_t = 55.261 [sec]) Background time interval of the image: -78.099 17.240 (delta_t = 95.339 [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 17.240 sec. to 176.972 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21526 ( -0.187233 0.189969 ) Norm@50keV : 9.90061E-04 ( -9.86662e-05 9.8565e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.01 using 59 PHA bins. # Reduced chi-squared = 0.9300 for 57 degrees of freedom # Null hypothesis probability = 6.255762e-01 Photon flux (15-150 keV) in 159.7 sec: 0.116469 ( -0.012206 0.012283 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59748e-06 ( -1.73921e-07 1.75138e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.240 sec. to 176.972 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2107 ( -0.310781 0.725113 ) Epeak [keV] : 9990.64 ( -9983.73 -9983.73 ) Norm@50keV : 9.94701E-04 ( -0.000348779 0.00128923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.01 using 59 PHA bins. # Reduced chi-squared = 0.9465 for 56 degrees of freedom # Null hypothesis probability = 5.889596e-01 Photon flux (15-150 keV) in 159.7 sec: 0.116260 ( -0.013482 0.012473 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59274e-06 ( -1.86613e-07 1.78163e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 67.128 sec. to 68.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4904 ( -0.823606 0.803059 ) Norm@50keV : 3.41867E-03 ( -0.00132171 0.0012209 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.14 using 59 PHA bins. # Reduced chi-squared = 1.020 for 57 degrees of freedom # Null hypothesis probability = 4.330779e-01 Photon flux (15-150 keV) in 1 sec: 0.425687 ( -0.156122 0.156406 ) ph/cm2/s Energy fluence (15-150 keV) : 3.24893e-08 ( -1.3088e-08 1.33682e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 67.128 sec. to 68.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.32515 ( -1.47069 2.11488 ) Epeak [keV] : 115.583 ( ) Norm@50keV : 1.38271E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.62 using 59 PHA bins. # Reduced chi-squared = 1.029 for 56 degrees of freedom # Null hypothesis probability = 4.151946e-01 Photon flux (15-150 keV) in 1 sec: 0.287969 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.21684e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 98.624 sec. Hardness ratio (energy fluence ratio) = 1.72282023777
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.932987e-07 S(50-150 keV) = 1.1041701e-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 = -3.290798474514064E-01, IMY = -4.562491105586993E-02
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: -78.099400 17.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9808 -15.6340 0.6 26.0 -76.8 3.7582 20.1 0.4 Sco X-1 256.0966 -37.7070 34.7 20.4 -139.4 0.0434 0.3 9.7 4U 1700-377 256.6098 -36.5419 7.6 19.3 -137.8 0.1960 1.5 11.0 GX 349+2 263.1741 -24.8951 0.0 8.2 -107.4 0.0188 0.1 12.7 GX 1+4 264.5483 -44.4655 10.6 23.0 -163.8 0.1492 1.1 8.4 4U 1735-44 268.3225 -1.4754 3.1 21.0 -6.0 -0.4965 -3.7 3.1 SW J1753.5-0127 270.2506 -25.0032 3.3 3.0 -152.6 0.4497 3.6 4.9 GX 5-1 270.2277 -25.8825 4.2 3.9 -157.8 0.3546 2.8 9.3 GRS 1758-258 273.8524 -14.0136 4.2 8.5 18.0 0.3618 2.7 9.0 GX 17+2 275.8964 -30.2697 32.5 8.9 158.6 0.0452 0.4 6.0 H1820-303 284.9058 -24.8756 15.1 12.5 108.1 0.1125 0.8 7.6 HT1900.1-2455 288.7587 11.0795 9.8 37.3 31.7 0.2766 1.2 8.4 GRS 1915+105 262.9607 -33.8136 191.3 13.9 -145.3 -0.0075 -0.1 1.9 GX 354-0 301.1464 17.2933 2.1 49.0 41.8 3.4234 5.6 ------ UNKNOWN 321.4284 -55.1225 2.8 49.3 148.0 2.5648 4.2 ------ UNKNOWN 289.3968 -78.3087 2.8 56.7 179.0 3.5498 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 17.240000 72.500600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0011 -15.5879 6.7 26.0 -76.6 -0.2698 -1.7 3.4 Sco X-1 255.7949 -37.9736 0.0 20.8 -139.5 -0.1579 -1.4 11.9 4U 1700-377 256.4846 -36.2802 9.0 19.2 -137.0 0.1469 1.3 8.9 GX 349+2 262.8989 -24.6366 17.6 8.4 -105.2 0.0710 0.7 8.9 GX 1+4 264.9404 -44.5940 6.4 23.0 -164.5 0.2147 1.8 12.1 4U 1735-44 268.3379 -1.6042 9.7 20.9 -6.0 0.1264 1.2 9.3 SW J1753.5-0127 270.4227 -25.2234 5.0 3.2 -156.8 0.2486 2.3 11.5 GX 5-1 270.4767 -25.8858 0.0 3.8 -161.0 -0.1627 -1.5 12.7 GRS 1758-258 274.1665 -14.1305 5.3 8.5 20.3 0.2346 2.2 10.9 GX 17+2 276.0812 -30.2038 0.0 8.9 157.5 -0.2031 -1.8 12.7 H1820-303 285.0415 -24.8957 3.8 12.6 108.1 -0.3331 -3.0 1.5 HT1900.1-2455 288.9259 10.8023 5.3 37.1 32.2 0.3873 2.2 11.4 GRS 1915+105 263.0647 -33.6878 12.5 13.7 -145.3 0.0988 0.9 9.6 GX 354-0 297.3703 -14.0974 1.9 25.7 79.2 0.8952 6.0 ------ UNKNOWN 276.1873 -40.2017 1.0 18.4 172.1 1.3693 11.8 ------ UNKNOWN 271.2166 -4.6781 2.4 17.6 1.9 0.5190 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 113.300610 298.900600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9978 -15.6249 1.6 36.6 -44.2 7.6798 7.2 1.4 Sco X-1 255.9658 -37.7492 5.4 15.9 -75.0 1.4152 2.1 5.8 4U 1700-377 256.6200 -36.5654 0.0 15.7 -70.3 -0.5939 -0.8 12.3 GX 349+2 263.1589 -24.6396 7.8 19.0 -26.4 0.8500 1.5 10.4 GX 1+4 264.7734 -44.5969 318.5 9.5 -108.8 -0.0215 -0.0 8.9 4U 1735-44 268.3104 -1.3102 7.0 39.5 0.2 -1.3604 -1.7 9.2 SW J1753.5-0127 270.1955 -25.0700 10.4 15.9 -7.5 0.5810 1.1 4.9 GX 5-1 270.3239 -25.8582 7.2 15.1 -8.0 0.8661 1.6 7.0 GRS 1758-258 273.8855 -14.1335 6.4 26.1 7.5 1.0994 1.8 9.1 GX 17+2 276.1107 -30.4057 10.1 9.8 12.3 -0.6448 -1.1 9.9 H1820-303 284.9053 -25.0271 261.8 16.8 40.9 -0.0250 -0.0 9.6 HT1900.1-2455 288.7236 11.0768 4.6 52.6 28.2 -7.6552 -2.5 9.0 GRS 1915+105 262.8084 -33.8181 10.0 12.4 -50.7 0.7107 1.2 9.1 GX 354-0 350.5921 -53.1667 2.6 50.2 143.9 15.5178 4.5 ------ UNKNOWN 155.4907 -76.9853 3.9 57.2 -154.1 11.2562 3.0 ------ UNKNOWN