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 Jun 24 18:36:01 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger208169
======================================================================
Trigger: 00208169 Segment: 000
BAT Trigger Time: 168231813.312 [s; MET]
Trigger Stop: 168231814.336 [s; MET]
UTC: 2006-05-02T03:03:32.144320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 240.857822844256 Dec: 66.5949806915925 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.69
Image Trigger?: NO
Rate S/N Ratio: 24.5560583156173 [ if not an image trigger ]
Image S/N Ratio: 12.69
Analysis Position: [ source = BAT ]
RA: 240.857822844256 Dec: 66.5949806915925 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 240.922839797869 Dec: 66.6032508130917 [deg; J2000]
{ 16h 03m 41.5s , +66d 36' 11.7" }
+/- 0.83881679747428 [arcmin] (estimated 90% radius based on SNR)
+/- 0.287361807740006 [arcmin] (formal 1-sigma fit error)
SNR: 39.0989732861164
Angular difference between the analysis and refined position is 1.626857 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 28.4480000138283 +/- 9.86122264373695
Measured from: -3.71999999880791
to: 24.7280000150204 [s; relative to TRIGTIME]
T50: 10.660000026226 +/- 0.874720530519142
Measured from: 0.77199998497963
to: 11.4320000112057 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.120000004768372
to: 0.879999995231628 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.64399999380112
to: 38.9839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.818862 1.283236 1.058050 0.284004
0.046184 0.048230 0.041648 0.032582 [error]
Peak 0.031018 0.066998 0.087655 0.034737
0.007791 0.008302 0.008216 0.006213 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 44.628 -5.644 38.984
T90 28.448 -3.720 24.728
T50 10.660 0.772 11.432
Peak 1.000 -0.120 0.880
====== 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 -1.430 -0.073 0.073 - - - 5.44e-03 -2.26e-04 2.26e-04 43.910 57
CPL -1.119 -0.287 0.308 151.533 -50.062 800.880 7.65e-03 -2.02e-03 2.97e-03 40.460 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 -0.937 -0.198 0.206 - - - 1.51e-02 -1.79e-03 1.77e-03 52.110 57
CPL -0.846 -0.273 0.876 761.989 -761.989 -761.989 1.65e-02 -2.78e-03 2.09e-02 52.070 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 2.90e-07 5.57e-07 8.27e-07 2.64e-06 2.33e-06 4.32e-06 erg/cm2
90%_error_low -2.27e-08 -2.63e-08 -4.15e-08 -2.83e-07 -1.03e-07 -3.10e-07 erg/cm2
90%_error_hi 2.33e-08 2.62e-08 4.14e-08 3.05e-07 1.03e-07 3.28e-07 erg/cm2
Peak flux PL 3.63e-01 5.12e-01 5.35e-01 1.03e+00 1.73e+00 2.44e+00 ph/cm2/s
90%_error_low -8.74e-02 -7.93e-02 -6.31e-02 -2.43e-01 -2.07e-01 -2.95e-01 ph/cm2/s
90%_error_hi 9.57e-02 7.80e-02 6.27e-02 2.89e-01 2.08e-01 3.04e-01 ph/cm2/s
Fluence CPL 2.72e-07 5.72e-07 8.50e-07 1.73e-06 2.29e-06 3.42e-06 erg/cm2
90%_error_low -2.78e-08 -2.98e-08 -4.67e-08 -5.32e-07 -1.12e-07 -5.36e-07 erg/cm2
90%_error_hi 2.83e-08 3.02e-08 4.73e-08 8.25e-07 1.11e-07 8.16e-07 erg/cm2
Peak flux CPL 3.54e-01 5.14e-01 5.42e-01 9.39e-01 1.73e+00 2.35e+00 ph/cm2/s
90%_error_low -1.15e-01 -8.07e-02 -6.81e-02 -4.82e-01 -2.12e-01 -5.42e-01 ph/cm2/s
90%_error_hi 8.43e-02 8.14e-02 8.46e-02 1.84e-01 2.03e-01 3.67e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 240.9228 66.6033 0.0049 34.9036 -131.7864 2.7730124 39.099 TRIG_00208169 Foreground time interval of the image: -5.644 11.389 (delta_t = 17.033 [sec]) Background time interval of the image: -214.411 -5.644 (delta_t = 208.767 [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 -5.644 sec. to 38.984 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4296 ( -0.0732114 0.0734501 ) Norm@50keV : 5.44215E-03 ( -0.000225624 0.000225615 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.91 using 59 PHA bins. # Reduced chi-squared = 0.7703 for 57 degrees of freedom # Null hypothesis probability = 8.982361e-01 Photon flux (15-150 keV) in 44.63 sec: 0.667356 ( -0.0297 0.029768 ) ph/cm2/s Energy fluence (15-150 keV) : 2.33344e-06 ( -1.02915e-07 1.03176e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.644 sec. to 38.984 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11875 ( -0.286698 0.307635 ) Epeak [keV] : 151.533 ( -50.0628 800.88 ) Norm@50keV : 7.65234E-03 ( -0.00201859 0.00296819 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.46 using 59 PHA bins. # Reduced chi-squared = 0.7225 for 56 degrees of freedom # Null hypothesis probability = 9.414073e-01 Photon flux (15-150 keV) in 44.63 sec: 0.656525 ( -0.031273 0.031313 ) ph/cm2/s Energy fluence (15-150 keV) : 2.28953e-06 ( -1.11637e-07 1.11107e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.120 sec. to 0.880 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.937086 ( -0.198062 0.206425 ) Norm@50keV : 1.51053E-02 ( -0.00179157 0.00177134 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.11 using 59 PHA bins. # Reduced chi-squared = 0.9142 for 57 degrees of freedom # Null hypothesis probability = 6.587642e-01 Photon flux (15-150 keV) in 1 sec: 1.73480 ( -0.20673 0.20782 ) ph/cm2/s Energy fluence (15-150 keV) : 1.67155e-07 ( -1.98898e-08 1.99434e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 0.880 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.845562 ( -0.273251 0.87617 ) Epeak [keV] : 761.989 ( -762.245 -762.245 ) Norm@50keV : 1.65292E-02 ( -0.00278303 0.0209332 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.07 using 59 PHA bins. # Reduced chi-squared = 0.9298 for 56 degrees of freedom # Null hypothesis probability = 6.245034e-01 Photon flux (15-150 keV) in 1 sec: 1.72928 ( -0.21177 0.20263 ) ph/cm2/s Energy fluence (15-150 keV) : 1.6674e-07 ( -2.03943e-08 2.00699e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 28.448 sec. Hardness ratio (energy fluence ratio) = 1.48497790353
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.473295e-07 S(50-150 keV) = 1.4861344e-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.
Mask shadow pattern
IMX = -4.649187605341465E-01, IMY = 5.202310314464613E-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: -214.411400 -5.644000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4531 35.3365 0.8 2.7 -131.7 2.0461 13.7 0.4 Her X-1 268.4312 -1.5394 8.2 36.5 35.0 0.3786 1.4 6.4 SW J1753.5-0127 288.8058 10.9268 0.9 37.9 -4.8 2.7933 12.3 1.2 GRS 1915+105 299.5967 35.2001 0.3 36.8 -48.6 8.5765 34.7 0.3 Cyg X-1 308.0142 40.7732 6.8 42.6 -58.7 -0.8280 -1.7 11.6 Cyg X-3 180.8074 51.8358 2.7 55.5 -168.3 2.2940 4.3 ------ UNKNOWN 227.8944 62.4154 2.6 34.3 -144.0 0.9266 4.5 ------ UNKNOWN 295.8252 65.8005 3.5 41.1 -98.0 2.4990 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.644000 11.388600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.7100 35.3896 7.8 2.7 -127.1 0.0590 1.5 12.7 Her X-1 268.3293 -1.5814 7.8 36.5 35.1 -0.1093 -1.5 8.1 SW J1753.5-0127 288.8042 10.9510 59.6 37.9 -4.8 -0.0116 -0.2 0.5 GRS 1915+105 299.5033 35.2510 77.7 36.7 -48.7 0.0103 0.1 5.2 Cyg X-1 308.2260 40.8637 8.2 42.7 -58.9 -0.2079 -1.4 7.5 Cyg X-3 271.1077 5.5079 2.4 31.1 25.6 0.2776 4.8 ------ UNKNOWN 186.7048 45.3496 2.1 52.9 -177.0 0.6435 5.4 ------ UNKNOWN 299.7808 2.9171 2.2 51.4 -6.3 0.5512 5.3 ------ UNKNOWN 240.9229 66.6032 0.3 34.9 -131.8 2.7729 39.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.188600 535.988600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4355 35.3577 1.0 32.2 48.0 4.9536 11.8 1.4 Her X-1 299.5985 35.2044 0.3 45.8 -8.1 16.9574 35.4 0.4 Cyg X-1 308.1543 41.1145 7.4 44.0 -20.5 -0.7067 -1.6 9.9 Cyg X-3 326.1550 38.3479 6.8 53.5 -34.5 2.1003 1.7 1.8 Cyg X-2 131.6316 41.8038 3.1 59.1 -166.2 9.3776 3.7 ------ UNKNOWN 343.2379 74.7274 4.2 30.4 -80.4 1.1816 2.8 ------ UNKNOWN 318.8689 28.9381 2.8 58.9 -22.7 7.0234 4.1 ------ UNKNOWN 99.8254 59.1959 3.7 51.0 -135.5 5.5426 3.2 ------ UNKNOWN