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: Fri Feb 10 13:47:26 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger729293
======================================================================
Trigger: 00729293 Segment: 000
BAT Trigger Time: 504930379.344 [s; MET]
Trigger Stop: 504930379.408 [s; MET]
UTC: 2017-01-01T02:26:00.951240 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 267.102656576912 Dec: 11.6542661795857 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.24
Image Trigger?: NO
Rate S/N Ratio: 98.9595877113481 [ if not an image trigger ]
Image S/N Ratio: 14.24
Analysis Position: [ source = BAT ]
RA: 267.102656576912 Dec: 11.6542661795857 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 267.089049977496 Dec: 11.6414954233128 [deg; J2000]
{ 17h 48m 21.4s , +11d 38' 29.4" }
+/- 1.09799239135421 [arcmin] (estimated 90% radius based on SNR)
+/- 0.389226605384475 [arcmin] (formal 1-sigma fit error)
SNR: 26.6145627906668
Angular difference between the analysis and refined position is 1.107459 arcmin
Partial Coding Fraction: 0.1464844 [ including projection effects ]
Duration
T90: 3.10400003194809 +/- 0.847999980989493
Measured from: -0.271999955177307
to: 2.83200007677078 [s; relative to TRIGTIME]
T50: 0.976000010967255 +/- 0.0715541870086366
Measured from: 0.0640000104904175
to: 1.04000002145767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.219999969005585
to: 0.780000030994415 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.63199996948242
to: 8.5120000243187 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.218976 4.046090 2.679502 0.508671
0.090968 0.099976 0.085390 0.055933 [error]
Peak 1.609857 2.413747 1.858522 0.453463
0.054512 0.068351 0.061896 0.036308 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 10.144 -1.632 8.512
T90 3.104 -0.272 2.832
T50 0.976 0.064 1.040
Peak 1.000 -0.220 0.780
====== 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 -1.798 -0.059 0.059 - - - 6.72e-02 -2.16e-03 2.15e-03 52.620 57
CPL -1.690 -0.183 0.226 150.793 N/A N/A 7.58e-02 N/A N/A 51.900 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 -1.519 -0.059 0.059 - - - 4.33e-01 -1.45e-02 1.45e-02 53.270 57
CPL -1.331 -0.207 0.232 195.029 -78.525 -195.029 5.30e-01 -1.03e-01 1.47e-01 51.190 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 1.15e-06 1.77e-06 2.03e-06 4.48e-06 6.28e-06 9.43e-06 erg/cm2
90%_error_low -6.59e-08 -5.97e-08 -8.56e-08 -4.01e-07 -2.05e-07 -4.62e-07 erg/cm2
90%_error_hi 6.73e-08 5.96e-08 8.53e-08 4.26e-07 2.05e-07 4.80e-07 erg/cm2
Peak flux PL 1.81e+01 1.81e+01 1.26e+01 1.39e+01 5.43e+01 6.27e+01 ph/cm2/s
90%_error_low -1.13e+00 -6.91e-01 -5.07e-01 -1.13e+00 -1.95e+00 -2.10e+00 ph/cm2/s
90%_error_hi 1.15e+00 6.89e-01 5.05e-01 1.19e+00 1.95e+00 2.10e+00 ph/cm2/s
Fluence CPL 1.13e-06 1.78e-06 2.05e-06 3.85e-06 6.23e-06 8.81e-06 erg/cm2
90%_error_low -8.27e-08 -6.59e-08 -9.19e-08 -9.87e-07 -2.23e-07 -1.01e-06 erg/cm2
90%_error_hi 7.96e-08 6.65e-08 9.28e-08 7.45e-07 2.22e-07 6.13e-07 erg/cm2
Peak flux CPL 1.74e+01 1.83e+01 1.29e+01 1.15e+01 5.38e+01 6.01e+01 ph/cm2/s
90%_error_low -1.41e+00 -7.47e-01 -6.00e-01 -2.30e+00 -2.04e+00 -3.21e+00 ph/cm2/s
90%_error_hi 1.44e+00 7.53e-01 6.06e-01 2.52e+00 2.04e+00 3.62e+00 ph/cm2/s
======================================================================
Image
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 -1.632 sec. to 8.512 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79814 ( -0.0593986 0.0589687 ) Norm@50keV : 6.72284E-02 ( -0.00216022 0.0021545 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.62 using 59 PHA bins. # Reduced chi-squared = 0.9232 for 57 degrees of freedom # Null hypothesis probability = 6.399405e-01 Photon flux (15-150 keV) in 10.14 sec: 9.25775 ( -0.32305 0.32423 ) ph/cm2/s Energy fluence (15-150 keV) : 6.27709e-06 ( -2.0458e-07 2.04898e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.632 sec. to 8.512 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69018 ( -0.183057 0.225878 ) Epeak [keV] : 150.793 ( ) Norm@50keV : 7.57532E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.90 using 59 PHA bins. # Reduced chi-squared = 0.9268 for 56 degrees of freedom # Null hypothesis probability = 6.307199e-01 Photon flux (15-150 keV) in 10.14 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 6.23316e-06 ( -2.23111e-07 2.22014e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.220 sec. to 0.780 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51895 ( -0.0588431 0.0586277 ) Norm@50keV : 0.432918 ( -0.0145364 0.0145295 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.27 using 59 PHA bins. # Reduced chi-squared = 0.9346 for 57 degrees of freedom # Null hypothesis probability = 6.156731e-01 Photon flux (15-150 keV) in 1 sec: 54.3267 ( -1.95 1.9535 ) ph/cm2/s Energy fluence (15-150 keV) : 4.09496e-06 ( -1.4557e-07 1.45862e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 0.780 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33136 ( -0.206989 0.231958 ) Epeak [keV] : 195.029 ( -78.5271 -195.031 ) Norm@50keV : 0.530316 ( -0.102683 0.146671 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.19 using 59 PHA bins. # Reduced chi-squared = 0.9141 for 56 degrees of freedom # Null hypothesis probability = 6.572656e-01 Photon flux (15-150 keV) in 1 sec: 53.8004 ( -2.0369 2.042 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37219e-06 ( -1.87046e-07 1.83217e-07 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.104 sec. Hardness ratio (energy fluence ratio) = 1.15021744017
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.918619e-06 S(50-150 keV) = 3.358512e-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.
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: -82.043400 -1.632000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4758 35.2266 8.7 14.5 -126.5 0.1368 1.3 7.0 Her X-1 299.5931 35.1952 1.0 50.0 -145.5 4.3379 11.2 0.4 Cyg X-1 308.1804 40.9239 4.7 54.3 -155.3 1.1741 2.5 3.6 Cyg X-3 243.7944 -0.9615 2.6 38.3 -48.9 0.9179 4.5 ------ UNKNOWN 277.1169 15.6960 2.7 41.5 -107.8 1.9480 4.3 ------ UNKNOWN 247.2592 -9.9795 2.3 47.8 -51.5 2.5712 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.632000 8.512000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5588 35.2167 6.2 14.6 -126.6 0.1558 1.9 9.0 Her X-1 299.6564 35.0985 6.7 50.1 -145.4 -0.6764 -1.7 7.0 Cyg X-1 308.3031 40.9898 8.5 54.3 -155.5 -0.6900 -1.4 9.0 Cyg X-3 184.9314 49.6222 2.5 39.0 88.7 0.8971 4.6 ------ UNKNOWN 212.4427 56.8176 3.0 25.7 111.6 0.2816 3.9 ------ UNKNOWN 215.9288 52.8504 2.2 21.6 107.3 0.3525 5.1 ------ UNKNOWN 203.8721 -7.6654 2.8 54.0 4.2 0.7784 4.2 ------ UNKNOWN 322.1884 58.5484 2.5 57.1 -179.0 1.6710 4.6 ------ UNKNOWN 277.2369 56.1394 2.8 33.3 -176.0 0.4048 4.2 ------ UNKNOWN 309.4282 54.6941 2.7 51.3 -172.3 0.8680 4.3 ------ UNKNOWN 305.4008 49.5185 3.4 49.9 -165.1 0.7035 3.4 ------ UNKNOWN 267.0890 11.6415 0.4 37.1 -92.6 11.3311 26.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 719.156600 782.796000 840.656000 962.775200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4651 35.3584 57.0 40.1 -50.7 0.0861 0.2 1.0 Her X-1 299.5854 35.2076 0.4 30.0 -114.7 8.8728 28.4 0.4 Cyg X-1 308.0085 40.9647 1.8 24.7 -130.0 1.4854 6.5 4.7 Cyg X-3 326.0838 38.2422 4.9 30.9 -157.6 0.5398 2.4 6.3 Cyg X-2 3.5919 48.0621 2.6 36.9 150.6 1.4293 4.4 ------ UNKNOWN 273.2533 27.3657 2.2 41.4 -78.2 4.1198 5.2 ------ UNKNOWN