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: Sat Mar 19 20:54:19 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger668543
======================================================================
Trigger: 00668543 Segment: 000
BAT Trigger Time: 472964728 [s; MET]
Trigger Stop: 472964728.256 [s; MET]
UTC: 2015-12-28T03:05:12.384680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 214.003951052387 Dec: -17.6890004436844 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 36.8510515453766 [ if not an image trigger ]
Image S/N Ratio: 6.53
Analysis Position: [ source = BAT ]
RA: 214.003951052387 Dec: -17.6890004436844 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 214.019846236906 Dec: -17.6664070977249 [deg; J2000]
{ 14h 16m 04.8s , -17d 39' 59.1" }
+/- 1.7825050825542 [arcmin] (estimated 90% radius based on SNR)
+/- 0.670078010584032 [arcmin] (formal 1-sigma fit error)
SNR: 13.3199619579118
Angular difference between the analysis and refined position is 1.631976 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.275999963283539 +/- 0.039999997615816
Measured from: -0.0279999971389771
to: 0.247999966144562 [s; relative to TRIGTIME]
T50: 0.167999982833862 +/- 0.0432666533938203
Measured from: 0.0199999809265137
to: 0.187999963760376 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.378000020980835
to: 0.621999979019165 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 0.276000022888184 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.012773 0.042010 0.045040 0.009667
0.003802 0.004469 0.004718 0.004119 [error]
Peak 0.016989 0.041701 0.041932 0.013461
0.006355 0.006844 0.006473 0.005673 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.312 -0.036 0.276
T90 0.276 -0.028 0.248
T50 0.168 0.020 0.188
Peak 1.000 -0.378 0.622
====== 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: CPL)
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 -0.824 -0.197 0.203 - - - 2.31e-02 -2.85e-03 2.84e-03 54.960 57
CPL 0.584 -0.969 1.233 101.966 -25.087 99.382 1.01e-01 -6.37e-02 2.51e-01 48.270 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 -0.927 -0.304 0.322 - - - 7.31e-03 -1.32e-03 1.31e-03 58.090 57
CPL -0.323 -0.848 1.510 159.557 -159.557 -159.557 1.35e-02 -7.27e-03 4.31e-02 57.340 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 4.91e-09 1.37e-08 3.09e-08 1.87e-07 8.34e-08 2.36e-07 erg/cm2
90%_error_low -1.12e-09 -2.01e-09 -4.13e-09 -4.97e-08 -1.12e-08 -5.26e-08 erg/cm2
90%_error_hi 1.21e-09 1.98e-09 4.11e-09 6.13e-08 1.13e-08 6.30e-08 erg/cm2
Peak flux PL 1.74e-01 2.47e-01 2.60e-01 5.04e-01 8.39e-01 1.19e+00 ph/cm2/s
90%_error_low -6.06e-02 -5.69e-02 -4.95e-02 -1.80e-01 -1.52e-01 -2.29e-01 ph/cm2/s
90%_error_hi 6.91e-02 5.56e-02 4.89e-02 2.40e-01 1.53e-01 2.47e-01 ph/cm2/s
Fluence CPL 3.56e-09 1.52e-08 3.50e-08 4.13e-08 7.66e-08 9.50e-08 erg/cm2
90%_error_low -1.30e-09 -2.45e-09 -5.10e-09 -2.38e-08 -1.26e-08 -2.59e-08 erg/cm2
90%_error_hi 1.45e-09 2.53e-09 5.24e-09 6.41e-08 1.26e-08 6.29e-08 erg/cm2
Peak flux CPL 1.48e-01 2.54e-01 2.78e-01 2.85e-01 8.19e-01 9.66e-01 ph/cm2/s
90%_error_low -7.34e-02 -6.20e-02 -6.02e-02 -2.85e-01 -1.57e-01 -2.53e-01 ph/cm2/s
90%_error_hi 8.36e-02 6.28e-02 6.27e-02 2.92e-01 1.58e-01 3.52e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 214.0198 -17.6664 0.0145 14.2243 -167.1569 0.1175101 13.320 TRIG_00668543 Foreground time interval of the image: -0.036 0.276 (delta_t = 0.312 [sec]) Background time interval of the image: -67.499 -0.036 (delta_t = 67.463 [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 -0.036 sec. to 0.276 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.824371 ( -0.196566 0.203026 ) Norm@50keV : 2.31150E-02 ( -0.00284636 0.00283681 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.96 using 59 PHA bins. # Reduced chi-squared = 0.9642 for 57 degrees of freedom # Null hypothesis probability = 5.519268e-01 Photon flux (15-150 keV) in 0.312 sec: 2.65468 ( -0.32399 0.3243 ) ph/cm2/s Energy fluence (15-150 keV) : 8.34363e-08 ( -1.11935e-08 1.12931e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.276 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.583979 ( -0.968552 1.23273 ) Epeak [keV] : 101.966 ( -25.0876 99.3817 ) Norm@50keV : 0.101308 ( -0.0637016 0.250547 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.27 using 59 PHA bins. # Reduced chi-squared = 0.8619 for 56 degrees of freedom # Null hypothesis probability = 7.591867e-01 Photon flux (15-150 keV) in 0.312 sec: 2.53317 ( -0.33594 0.33578 ) ph/cm2/s Energy fluence (15-150 keV) : 7.65729e-08 ( -1.26091e-08 1.26085e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.378 sec. to 0.622 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.9271 ( -0.303625 0.322195 ) Norm@50keV : 7.30736E-03 ( -0.00132434 0.0013133 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.09 using 59 PHA bins. # Reduced chi-squared = 1.019 for 57 degrees of freedom # Null hypothesis probability = 4.348806e-01 Photon flux (15-150 keV) in 1 sec: 0.839045 ( -0.152114 0.152736 ) ph/cm2/s Energy fluence (15-150 keV) : 8.1169e-08 ( -1.55409e-08 1.57012e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.378 sec. to 0.622 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.322614 ( -0.848305 1.50958 ) Epeak [keV] : 159.557 ( -159.558 -159.558 ) Norm@50keV : 1.35369E-02 ( -0.00727411 0.0430815 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.34 using 59 PHA bins. # Reduced chi-squared = 1.024 for 56 degrees of freedom # Null hypothesis probability = 4.251674e-01 Photon flux (15-150 keV) in 1 sec: 0.818779 ( -0.157238 0.1577 ) ph/cm2/s Energy fluence (15-150 keV) : 7.86466e-08 ( -1.67182e-08 1.65848e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.276 sec. Hardness ratio (energy fluence ratio) = 2.30260724073
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8738299e-08 S(50-150 keV) = 5.783482e-08
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 = -2.471490745748556E-01, IMY = 5.634636703088051E-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: -67.499400 -0.036000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3029 -60.6036 2.7 38.8 17.4 0.7207 4.3 1.2 Cen X-3 186.6402 -62.7296 3.6 34.8 5.8 0.4339 3.2 2.5 GX 301-2 244.9837 -15.6536 1.1 37.0 -116.8 2.1989 11.0 0.8 Sco X-1 255.9403 -37.8528 2.8 39.8 -77.6 1.6206 4.1 2.3 4U 1700-377 256.4871 -36.4958 64.3 40.4 -79.7 0.0728 0.2 5.0 GX 349+2 127.5362 -84.6796 2.7 58.5 -5.1 2.8525 4.3 ------ UNKNOWN 245.4680 -7.6297 2.5 42.0 -126.8 1.1349 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.036000 0.276000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3492 -60.8083 6.5 38.9 17.1 0.0253 1.8 11.2 Cen X-3 186.3370 -62.7874 13.1 34.9 5.9 0.0103 0.9 8.8 GX 301-2 245.0687 -15.5783 9.5 37.1 -116.9 0.0222 1.2 6.4 Sco X-1 255.9342 -37.7347 7.6 39.8 -77.8 0.0525 1.5 7.0 4U 1700-377 256.4194 -36.5033 7.5 40.3 -79.7 -0.0586 -1.5 4.9 GX 349+2 213.0662 11.1716 2.3 42.2 176.2 0.0752 4.9 ------ UNKNOWN 214.0198 -17.6664 0.9 14.2 -167.2 0.1175 13.3 ------ UNKNOWN 232.9542 7.5313 2.2 45.2 -155.1 0.0828 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.700600 201.100600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4564 -60.6016 3.6 39.1 16.8 0.7298 3.2 4.3 Cen X-3 186.5787 -62.7509 1.9 35.2 5.3 1.1885 6.0 2.4 GX 301-2 244.9642 -15.6200 0.7 37.2 -115.8 4.5009 15.8 1.5 Sco X-1 255.9791 -37.8289 1.5 40.4 -76.9 4.5343 7.8 1.0 4U 1700-377 256.4380 -36.3765 4.1 40.9 -79.1 1.8266 2.9 2.8 GX 349+2 201.5287 12.8337 2.7 43.4 160.2 1.4430 4.3 ------ UNKNOWN 155.2941 -82.7835 2.7 55.6 -4.3 2.3078 4.3 ------ UNKNOWN 241.9469 -56.8839 2.5 35.8 -43.0 1.0169 4.6 ------ UNKNOWN