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 Sep 28 17:34:36 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger772006
======================================================================
Trigger: 00772006 Segment: 000
BAT Trigger Time: 526872876.608 [s; MET]
Trigger Stop: 526872880.704 [s; MET]
UTC: 2017-09-12T01:34:16.935740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 167.372184088217 Dec: -54.3596433863869 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.13
Image Trigger?: NO
Rate S/N Ratio: 13.7477270848675 [ if not an image trigger ]
Image S/N Ratio: 10.13
Analysis Position: [ source = BAT ]
RA: 167.372184088217 Dec: -54.3596433863869 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 167.38540773673 Dec: -54.3436488012755 [deg; J2000]
{ 11h 09m 32.5s , -54d 20' 37.1" }
+/- 2.02751875572444 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03514925446332 [arcmin] (formal 1-sigma fit error)
SNR: 11.0814635506224
Angular difference between the analysis and refined position is 1.065270 arcmin
Partial Coding Fraction: 0.3476562 [ including projection effects ]
Duration
T90: 21.1840000152588 +/- 5.43548050044814
Measured from: -0.120000004768372
to: 21.0640000104904 [s; relative to TRIGTIME]
T50: 8.89600002765656 +/- 3.83533050225048
Measured from: 2.12000000476837
to: 11.0160000324249 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.48400002717972
to: 3.48400002717972 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.20800000429153
to: 26.3120000362396 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.698288 0.691404 0.416102 0.086586
0.078741 0.072286 0.058080 0.050948 [error]
Peak 0.096947 0.076263 0.037659 0.014350
0.015877 0.014470 0.011682 0.010129 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 27.520 -1.208 26.312
T90 21.184 -0.120 21.064
T50 8.896 2.120 11.016
Peak 1.000 2.484 3.484
====== 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 -2.010 -0.218 0.208 - - - 4.35e-03 -5.72e-04 5.58e-04 40.320 57
CPL -1.986 -0.107 0.875 26.994 -24.757 -26.994 4.49e-03 N/A N/A 40.320 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 -2.253 -0.449 0.393 - - - 1.19e-02 -3.35e-03 3.14e-03 45.500 57
CPL -2.489 -0.263 1.546 189.912 N/A N/A 8.95e-03 N/A N/A 45.350 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 2.47e-07 3.34e-07 3.32e-07 5.94e-07 1.11e-06 1.51e-06 erg/cm2
90%_error_low -4.20e-08 -3.70e-08 -5.91e-08 -1.91e-07 -1.36e-07 -2.57e-07 erg/cm2
90%_error_hi 4.36e-08 3.69e-08 5.94e-08 2.44e-07 1.38e-07 2.93e-07 erg/cm2
Peak flux PL 1.01e+00 6.57e-01 2.75e-01 1.58e-01 2.03e+00 2.10e+00 ph/cm2/s
90%_error_low -2.86e-01 -1.31e-01 -9.86e-02 -8.71e-02 -4.06e-01 -4.16e-01 ph/cm2/s
90%_error_hi 3.03e-01 1.31e-01 1.02e-01 1.35e-01 4.08e-01 4.16e-01 ph/cm2/s
Fluence CPL 2.47e-07 3.35e-07 3.32e-07 5.68e-07 1.10e-06 1.48e-06 erg/cm2
90%_error_low N/A N/A N/A -4.15e-07 N/A -4.57e-07 erg/cm2
90%_error_hi N/A N/A N/A 5.89e-07 N/A 3.39e-07 erg/cm2
Peak flux CPL 9.76e-01 6.73e-01 2.79e-01 N/A 1.99e+00 2.05e+00 ph/cm2/s
90%_error_low -2.54e-01 -1.33e-01 N/A -8.71e-02 -3.96e-01 N/A ph/cm2/s
90%_error_hi 2.67e-01 1.34e-01 N/A 1.35e-01 3.98e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 167.3854 -54.3436 0.0173 40.6395 -139.7028 1.7896122 11.081 TRIG_00772006 Foreground time interval of the image: -1.208 26.312 (delta_t = 27.520 [sec]) Background time interval of the image: -77.907 -1.208 (delta_t = 76.699 [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 -1.208 sec. to 26.312 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.0096 ( -0.217587 0.208216 ) Norm@50keV : 4.35423E-03 ( -0.000572253 0.00055815 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.32 using 59 PHA bins. # Reduced chi-squared = 0.7075 for 57 degrees of freedom # Null hypothesis probability = 9.537863e-01 Photon flux (15-150 keV) in 27.52 sec: 0.656082 ( -0.075132 0.075411 ) ph/cm2/s Energy fluence (15-150 keV) : 1.10581e-06 ( -1.35992e-07 1.3753e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.208 sec. to 26.312 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.98578 ( -0.107244 0.875378 ) Epeak [keV] : 26.9937 ( -24.7657 -27.0027 ) Norm@50keV : 4.48744E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.32 using 59 PHA bins. # Reduced chi-squared = 0.7200 for 56 degrees of freedom # Null hypothesis probability = 9.433133e-01 Photon flux (15-150 keV) in 27.52 sec: 0.655345 ( -0.078908 0.073835 ) ph/cm2/s Energy fluence (15-150 keV) : 1.10354e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.484 sec. to 3.484 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.25334 ( -0.449191 0.393492 ) Norm@50keV : 1.18941E-02 ( -0.00334767 0.00314462 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.50 using 59 PHA bins. # Reduced chi-squared = 0.7983 for 57 degrees of freedom # Null hypothesis probability = 8.633860e-01 Photon flux (15-150 keV) in 1 sec: 2.02622 ( -0.40635 0.40765 ) ph/cm2/s Energy fluence (15-150 keV) : 1.12766e-07 ( -2.56456e-08 2.63445e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.484 sec. to 3.484 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.48865 ( -0.254834 1.55376 ) Epeak [keV] : 189.912 ( ) Norm@50keV : 8.94737E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.34 using 59 PHA bins. # Reduced chi-squared = 0.8097 for 56 degrees of freedom # Null hypothesis probability = 8.449202e-01 Photon flux (15-150 keV) in 1 sec: 1.99450 ( -0.3957 0.39777 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 21.184 sec. Hardness ratio (energy fluence ratio) = 0.993413005569
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.812599e-07 S(50-150 keV) = 5.245621e-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 = -6.546266131044436E-01, IMY = 5.551078567736205E-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: -77.907400 -1.208000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2125 -60.5619 3.4 37.6 -148.6 0.8023 3.4 4.8 Cen X-3 186.6347 -62.7489 3.2 29.8 -152.2 0.6159 3.6 1.4 GX 301-2 244.9894 -15.6343 0.5 33.6 4.7 4.0770 22.4 0.7 Sco X-1 256.1211 -37.8704 2.9 19.0 51.3 0.6345 3.9 6.6 4U 1700-377 256.3022 -36.4354 7.1 20.1 48.4 0.2673 1.6 6.5 GX 349+2 262.9958 -24.7324 5.3 32.6 40.1 0.4759 2.2 1.1 GX 1+4 264.7178 -44.5932 15.8 21.4 77.7 0.1370 0.7 8.7 4U 1735-44 270.4244 -25.2065 3.6 36.5 49.8 0.8730 3.2 10.8 GX 5-1 270.1312 -25.6959 3.3 36.0 50.0 0.9383 3.5 9.7 GRS 1758-258 273.9123 -13.9010 5.7 47.4 43.0 -1.1243 -2.0 9.8 GX 17+2 275.8491 -30.2464 4.4 36.4 61.5 0.8824 2.6 8.2 H1820-303 263.0288 -33.7518 4.8 26.0 52.7 0.4456 2.4 5.4 GX 354-0 312.5510 -62.9198 2.0 43.8 125.0 3.4875 5.8 ------ UNKNOWN 233.8387 -57.2242 0.3 9.3 165.4 4.6424 34.0 ------ UNKNOWN 195.9670 -60.0142 2.8 24.9 -148.0 0.6434 4.2 ------ UNKNOWN 133.8450 -58.7083 2.7 55.0 -156.2 2.9518 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.208000 26.312000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4459 -60.6914 209.2 37.4 -148.8 0.0070 0.1 5.6 Cen X-3 186.8658 -62.8665 38.4 29.7 -152.5 -0.0291 -0.3 8.1 GX 301-2 245.1085 -15.5920 45.9 33.6 4.8 0.0249 0.3 8.0 Sco X-1 255.9466 -37.9886 7.0 18.8 51.4 0.1464 1.7 8.9 4U 1700-377 256.2734 -36.5648 4.9 20.0 48.6 0.2175 2.4 11.6 GX 349+2 263.1124 -24.8737 4.4 32.6 40.4 -0.3103 -2.6 9.5 GX 1+4 264.6069 -44.3203 5.8 21.4 76.9 0.2026 2.0 9.7 4U 1735-44 270.4745 -25.2083 4.9 36.6 49.9 -0.3866 -2.3 12.9 GX 5-1 270.1805 -25.8803 0.0 35.9 50.3 0.1650 1.0 10.5 GRS 1758-258 274.1368 -14.0171 6.8 47.5 43.4 -0.5715 -1.7 7.7 GX 17+2 275.8365 -30.4327 6.2 36.3 61.7 0.3259 1.9 6.0 H1820-303 263.1273 -33.6909 3.3 26.1 52.7 -0.3610 -3.5 11.0 GX 354-0 237.8222 10.9159 2.4 59.0 -10.4 2.3773 4.8 ------ UNKNOWN 167.3854 -54.3437 1.0 40.6 -139.7 1.7895 11.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 102.692600 962.455000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5076 -40.6254 2.6 25.2 -163.4 3.6050 4.5 4.3 Vela X-1 170.4014 -60.6547 1.8 6.5 73.6 4.8882 6.3 3.2 Cen X-3 186.6983 -62.7804 0.7 13.0 44.6 12.5218 15.7 1.3 GX 301-2 233.8316 -57.2191 0.3 35.9 29.0 48.2446 41.6 ------ UNKNOWN 200.0574 -61.4331 3.5 18.5 32.3 2.3691 3.3 ------ UNKNOWN 113.7126 -22.9231 3.2 50.6 -167.0 8.6147 3.6 ------ UNKNOWN