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 Aug 2 14:57:46 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger761119
======================================================================
Trigger: 00761119 Segment: 000
BAT Trigger Time: 521340363.968 [s; MET]
Trigger Stop: 521340368.064 [s; MET]
UTC: 2017-07-10T00:45:44.623200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.81245248794 Dec: -38.5470762478186 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.88
Image Trigger?: NO
Rate S/N Ratio: 7.87400787401181 [ if not an image trigger ]
Image S/N Ratio: 6.88
Analysis Position: [ source = BAT ]
RA: 231.81245248794 Dec: -38.5470762478186 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 231.849844108435 Dec: -38.5227185855827 [deg; J2000]
{ 15h 27m 24.0s , -38d 31' 21.8" }
+/- 2.51906033302231 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31900280964353 [arcmin] (formal 1-sigma fit error)
SNR: 8.12681594328101
Angular difference between the analysis and refined position is 2.283777 arcmin
Partial Coding Fraction: 0.2285156 [ including projection effects ]
Duration
T90: 33.1200000047684 +/- 10.8611601354231
Measured from: 0.568000018596649
to: 33.688000023365 [s; relative to TRIGTIME]
T50: 15.9679999947548 +/- 7.83892645512002
Measured from: 3.19200003147125
to: 19.160000026226 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.491999983787537
to: 1.49199998378754 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.167999982833862
to: 36.7919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.419266 0.497776 0.326038 0.055708
0.085266 0.084466 0.074213 0.067624 [error]
Peak 0.016995 0.029650 0.047331 0.034167
0.014286 0.013706 0.013653 0.011141 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 36.624 0.168 36.792
T90 33.120 0.568 33.688
T50 15.968 3.192 19.160
Peak 1.000 0.492 1.492
====== 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 -1.892 -0.374 0.344 - - - 2.27e-03 -5.23e-04 4.99e-04 48.730 57
CPL -1.892 N/A N/A 9999.160 N/A N/A 2.27e-03 N/A N/A 48.730 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 -0.894 -0.601 0.686 - - - 8.43e-03 -3.08e-03 2.85e-03 43.260 57
CPL -0.896 -0.596 0.703 9999.350 -9999.350 -9999.350 8.50e-03 -2.83e-03 6.63e-02 43.260 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 1.54e-07 2.23e-07 2.40e-07 4.82e-07 7.65e-07 1.10e-06 erg/cm2
90%_error_low -4.12e-08 -4.09e-08 -7.35e-08 -2.43e-07 -1.67e-07 -3.32e-07 erg/cm2
90%_error_hi 4.31e-08 4.09e-08 7.51e-08 3.71e-07 1.73e-07 4.31e-07 erg/cm2
Peak flux PL 1.95e-01 2.82e-01 3.03e-01 6.08e-01 9.68e-01 1.39e+00 ph/cm2/s
90%_error_low -1.25e-01 -1.33e-01 -9.80e-02 -3.50e-01 -3.31e-01 -4.52e-01 ph/cm2/s
90%_error_hi 1.78e-01 1.31e-01 9.63e-02 5.89e-01 3.39e-01 5.06e-01 ph/cm2/s
Fluence CPL 1.55e-07 2.20e-07 2.40e-07 5.29e-07 7.70e-07 1.09e-06 erg/cm2
90%_error_low -4.38e-08 -3.95e-08 -8.02e-08 -4.07e-07 -1.78e-07 -4.84e-07 erg/cm2
90%_error_hi 4.47e-08 5.56e-08 8.21e-08 1.53e-07 1.29e-07 2.16e-07 erg/cm2
Peak flux CPL 2.10e-01 2.82e-01 3.02e-01 6.35e-01 9.73e-01 1.41e+00 ph/cm2/s
90%_error_low N/A -1.42e-01 -9.67e-02 N/A -3.44e-01 -6.79e-01 ph/cm2/s
90%_error_hi N/A 1.31e-01 1.28e-01 N/A 3.38e-01 4.80e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 231.8498 -38.5227 0.0235 35.3359 125.6589 1.2712620 8.127 TRIG_00761119 Foreground time interval of the image: 0.168 36.792 (delta_t = 36.624 [sec]) Background time interval of the image: -606.567 -589.275 (delta_t = 17.292 [sec]) -239.968 0.168 (delta_t = 240.136 [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 0.168 sec. to 36.792 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89223 ( -0.374249 0.344352 ) Norm@50keV : 2.27124E-03 ( -0.000522515 0.000498601 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.73 using 59 PHA bins. # Reduced chi-squared = 0.8549 for 57 degrees of freedom # Null hypothesis probability = 7.740993e-01 Photon flux (15-150 keV) in 36.62 sec: 0.324897 ( -0.06001 0.060058 ) ph/cm2/s Energy fluence (15-150 keV) : 7.64765e-07 ( -1.67443e-07 1.72707e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 36.792 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89247 ( ) Epeak [keV] : 9999.16 ( ) Norm@50keV : 2.27217E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.73 using 59 PHA bins. # Reduced chi-squared = 0.8702 for 56 degrees of freedom # Null hypothesis probability = 7.439363e-01 Photon flux (15-150 keV) in 36.62 sec: 0.325938 ( -0.063032 0.060564 ) ph/cm2/s Energy fluence (15-150 keV) : 7.70049e-07 ( -1.78081e-07 1.28824e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.492 sec. to 1.492 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.893892 ( -0.601316 0.686477 ) Norm@50keV : 8.43425E-03 ( -0.0030785 0.00285363 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.26 using 59 PHA bins. # Reduced chi-squared = 0.7590 for 57 degrees of freedom # Null hypothesis probability = 9.105124e-01 Photon flux (15-150 keV) in 1 sec: 0.968013 ( -0.330753 0.339177 ) ph/cm2/s Energy fluence (15-150 keV) : 9.48899e-08 ( -3.07187e-08 3.0852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.492 sec. to 1.492 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.896011 ( -0.599183 0.700208 ) Epeak [keV] : 9999.35 ( -9999.36 -9999.36 ) Norm@50keV : 8.50147E-03 ( -0.00282104 0.0663482 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.26 using 59 PHA bins. # Reduced chi-squared = 0.7725 for 56 degrees of freedom # Null hypothesis probability = 8.934256e-01 Photon flux (15-150 keV) in 1 sec: 0.972524 ( -0.343549 0.338016 ) ph/cm2/s Energy fluence (15-150 keV) : 9.49883e-08 ( -3.12926e-08 3.11683e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 33.12 sec. Hardness ratio (energy fluence ratio) = 1.07760615956
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.761862e-07 S(50-150 keV) = 3.885622e-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 = -4.133066594442243E-01, IMY = -5.760480846399125E-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: -606.567400 -589.275000 -239.968000 0.168000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9882 -15.6674 0.9 35.3 80.6 8.2998 12.5 1.7 Sco X-1 213.9751 -34.1794 3.7 25.0 147.7 0.8152 3.2 ------ UNKNOWN 215.9474 46.8908 4.1 56.7 -17.7 2.8655 2.8 ------ UNKNOWN 168.8013 -6.0153 2.5 40.3 -111.2 3.1666 4.6 ------ UNKNOWN 169.9136 2.2390 3.5 41.0 -98.4 3.4398 3.3 ------ UNKNOWN 160.5223 -18.1715 2.5 48.0 -129.1 5.3371 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.168000 36.792000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9864 -15.6760 411.0 35.3 80.6 -0.0054 -0.0 2.2 Sco X-1 231.8498 -38.5227 1.4 35.3 125.7 1.2711 8.1 ------ UNKNOWN 169.7641 -10.6872 2.4 38.9 -118.4 0.7451 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 112.532590 662.312000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4060 -60.7702 4.9 43.4 -140.3 -6.0024 -2.3 9.2 Cen X-3 186.9684 -62.7837 26.9 36.1 -145.7 -0.7328 -0.4 8.6 GX 301-2 244.9835 -15.6094 1.3 25.7 31.6 14.9639 9.2 1.9 Sco X-1 255.9906 -37.8151 1.5 19.0 96.5 12.7819 7.7 1.8 4U 1700-377 256.4214 -36.5592 5.5 19.6 93.0 3.4271 2.1 8.2 GX 349+2 262.8326 -24.7068 6.4 29.6 72.5 4.4921 1.8 9.9 GX 1+4 264.7328 -44.6006 19.8 25.2 115.7 -1.0887 -0.6 9.0 4U 1735-44 270.2837 -25.0787 10.0 35.1 80.1 4.0566 1.2 0.0 GX 5-1 270.3598 -25.8555 2591.3 34.7 81.3 -0.0127 -0.0 7.4 GRS 1758-258 276.1008 -30.3349 6.1 37.1 92.1 -7.8289 -1.9 9.3 H1820-303 263.0762 -33.7968 4.1 25.6 90.2 5.9022 2.9 4.9 GX 354-0 207.5189 -58.2888 3.2 25.2 -148.4 5.1359 3.6 ------ UNKNOWN 215.4495 16.0927 4.0 56.7 -17.7 20.5571 2.9 ------ UNKNOWN 136.6005 -67.4833 2.4 56.7 -151.8 39.4523 4.9 ------ UNKNOWN 163.3957 -52.3266 3.0 48.0 -129.0 26.9153 3.9 ------ UNKNOWN