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 May 31 13:17:44 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger832119
======================================================================
Trigger: 00832119 Segment: 000
BAT Trigger Time: 547855328 [s; MET]
Trigger Stop: 547855448 [s; MET]
UTC: 2018-05-12T22:01:47.066860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 201.953361498894 Dec: 21.4063155534925 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.5
Analysis Position: [ source = BAT ]
RA: 201.953361498894 Dec: 21.4063155534925 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 201.939625778852 Dec: 21.4043273482844 [deg; J2000]
{ 13h 27m 45.5s , +21d 24' 15.6" }
+/- 1.92967210949105 [arcmin] (estimated 90% radius based on SNR)
+/- 0.849188788236229 [arcmin] (formal 1-sigma fit error)
SNR: 11.8928182046884
Angular difference between the analysis and refined position is 0.776513 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 24 +/- 7.07106781186548
Measured from: 30
to: 54 [s; relative to TRIGTIME]
T50: 9 +/- 3.60555127546399
Measured from: 37
to: 46 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 54
to: 55 [s; relative to TRIGTIME]
Total Fluence
Measured from: 29
to: 55 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.293632 0.354002 0.123736 0.066533
0.039229 0.040507 0.035347 0.031572 [error]
Peak 0.038025 0.019005 0.016556 -0.003165
0.008550 0.007937 0.006863 0.006270 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 26.000 29.000 55.000
T90 24.000 30.000 54.000
T50 9.000 37.000 46.000
Peak 1.000 54.000 55.000
====== 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 -2.101 -0.284 0.262 - - - 1.76e-03 -3.45e-04 3.35e-04 54.880 57
CPL -1.367 -0.707 2.291 31.655 N/A N/A 5.08e-03 N/A N/A 54.020 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 -2.802 -1.330 0.823 - - - 2.69e-03 -2.69e-03 2.01e-03 77.840 57
CPL -1.983 -0.032 1.385 0.976 317.883 -0.976 7.55e-03 -7.55e-03 -3.09e-03 78.690 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 1.03e-07 1.31e-07 1.22e-07 2.01e-07 4.24e-07 5.58e-07 erg/cm2
90%_error_low -1.91e-08 -1.93e-08 -3.16e-08 -8.52e-08 -7.36e-08 -1.29e-07 erg/cm2
90%_error_hi 1.95e-08 1.91e-08 3.32e-08 1.20e-07 7.62e-08 1.56e-07 erg/cm2
Peak flux PL 3.93e-01 1.86e-01 5.32e-02 1.91e-02 6.43e-01 6.51e-01 ph/cm2/s
90%_error_low -1.55e-01 -9.26e-02 -4.22e-02 -1.91e-02 -2.05e-01 -2.09e-01 ph/cm2/s
90%_error_hi 1.58e-01 7.58e-02 6.02e-02 5.95e-02 2.05e-01 2.11e-01 ph/cm2/s
Fluence CPL 1.00e-07 1.43e-07 1.09e-07 4.84e-08 3.85e-07 4.01e-07 erg/cm2
90%_error_low N/A -2.66e-08 -5.92e-08 N/A -9.17e-08 -1.07e-07 erg/cm2
90%_error_hi N/A 3.08e-08 4.20e-08 N/A 1.02e-07 3.01e-07 erg/cm2
Peak flux CPL 3.90e-01 1.35e-01 2.78e-02 1.02e-02 N/A 6.56e-01 ph/cm2/s
90%_error_low -1.56e-01 -1.35e-01 -2.78e-02 -1.02e-02 -2.05e-01 -2.11e-01 ph/cm2/s
90%_error_hi 1.57e-01 1.22e-01 8.26e-02 1.07e-01 2.05e-01 2.14e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 201.9396 21.4043 0.0162 34.1447 10.3286 0.9422493 11.893 TRIG_00832119 Foreground time interval of the image: 29.000 55.000 (delta_t = 26.000 [sec]) Background time interval of the image: -239.000 29.000 (delta_t = 268.000 [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 29.000 sec. to 55.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.10065 ( -0.283929 0.261723 ) Norm@50keV : 1.75668E-03 ( -0.00034457 0.000335489 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.88 using 59 PHA bins. # Reduced chi-squared = 0.9628 for 57 degrees of freedom # Null hypothesis probability = 5.551419e-01 Photon flux (15-150 keV) in 26 sec: 0.276483 ( -0.038983 0.038983 ) ph/cm2/s Energy fluence (15-150 keV) : 4.24466e-07 ( -7.35899e-08 7.61602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.000 sec. to 55.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36653 ( -0.709577 2.28795 ) Epeak [keV] : 31.6550 ( ) Norm@50keV : 5.08059E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.02 using 59 PHA bins. # Reduced chi-squared = 0.9646 for 56 degrees of freedom # Null hypothesis probability = 5.503599e-01 Photon flux (15-150 keV) in 26 sec: 0.276930 ( -0.039485 0.038562 ) ph/cm2/s Energy fluence (15-150 keV) : 3.85003e-07 ( -9.17426e-08 1.02294e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 54.000 sec. to 55.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.80234 ( -1.33003 0.823817 ) Norm@50keV : 2.68782E-03 ( -0.00268692 0.00201436 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 77.84 using 59 PHA bins. # Reduced chi-squared = 1.366 for 57 degrees of freedom # Null hypothesis probability = 3.475302e-02 Photon flux (15-150 keV) in 1 sec: 0.642855 ( -0.204729 0.204721 ) ph/cm2/s Energy fluence (15-150 keV) : 2.96982e-08 ( -1.25148e-08 1.447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 54.000 sec. to 55.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.43502 ( -0.0321507 1.38463 ) Epeak [keV] : 411.272 ( -93.2369 -412.095 ) Norm@50keV : 1.33210E-03 ( -0.00132215 0.00313651 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 77.53 using 59 PHA bins. # Reduced chi-squared = 1.384 for 56 degrees of freedom # Null hypothesis probability = 2.998592e-02 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 24.0 sec. Hardness ratio (energy fluence ratio) = 0.932674173455
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.341792e-07 S(50-150 keV) = 1.902876e-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 = 6.671994961526532E-01, IMY = -1.215945848633981E-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: -239.000000 29.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4833 -40.5410 10.7 55.0 -148.4 2.0475 1.1 2.2 Vela X-1 170.3697 -60.5679 8.3 52.6 175.2 1.2692 1.4 3.7 Cen X-3 186.6104 -62.7474 7.7 53.3 165.2 1.8696 1.5 1.9 GX 301-2 216.6622 32.1777 2.2 50.3 18.0 3.3723 5.3 ------ UNKNOWN 195.2707 13.2413 3.1 24.1 5.1 0.9938 3.7 ------ UNKNOWN 138.9448 -24.0844 3.0 48.0 -129.0 4.9432 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 29.000000 55.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5470 -40.5226 6.5 55.0 -148.4 0.6044 1.8 2.1 Vela X-1 170.4517 -60.6406 4.0 52.7 175.1 0.6452 2.9 4.1 Cen X-3 186.4649 -62.7346 10.2 53.3 165.3 0.3266 1.1 5.7 GX 301-2 190.0561 -44.1808 2.6 34.9 161.2 0.3818 4.4 ------ UNKNOWN 201.9396 21.4045 1.0 34.1 10.3 0.9417 11.9 ------ UNKNOWN 192.9440 26.8005 2.9 36.7 -6.1 0.3159 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 196.300590 383.700610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4403 35.2339 14.4 47.7 7.8 -0.2833 -0.8 6.6 Her X-1 204.5790 -10.3928 2.5 31.9 121.7 1.4150 4.6 ------ UNKNOWN 237.0891 12.7835 2.6 34.6 45.2 1.4547 4.5 ------ UNKNOWN 161.0449 -4.9617 2.6 48.0 -172.0 1.8514 4.5 ------ UNKNOWN 254.0456 53.8988 2.6 50.8 -16.5 1.7962 4.5 ------ UNKNOWN