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 May 9 20:00:03 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger106442
======================================================================
Trigger: 00106442 Segment: 000
BAT Trigger Time: 130539950.656 [s; MET]
Trigger Stop: 130539951.68 [s; MET]
UTC: 2005-02-19T21:05:51.256640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.2744828107666 Dec: -57.7615005591533 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17
Image Trigger?: NO
Rate S/N Ratio: 88.6284378740819 [ if not an image trigger ]
Image S/N Ratio: 17
Analysis Position: [ source = BAT ]
RA: 81.2744828107666 Dec: -57.7615005591533 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 81.2999190539987 Dec: -57.7587260653094 [deg; J2000]
{ 05h 25m 12.0s , -57d 45' 31.4" }
+/- 0.991614765792132 [arcmin] (estimated 90% radius based on SNR)
+/- 0.530173328050551 [arcmin] (formal 1-sigma fit error)
SNR: 30.7852501614301
Angular difference between the analysis and refined position is 0.831006 arcmin
Partial Coding Fraction: 0.07226562 [ including projection effects ]
Duration
T90: 28.7199999988079 +/- 7.12028763106389
Measured from: -14.3760000020266
to: 14.3439999967813 [s; relative to TRIGTIME]
T50: 6.91200000047684 +/- 0.301887392005334
Measured from: 0.631999999284744
to: 7.54399999976158 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.84399999678135
to: 3.84399999678135 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.5920000076294
to: 38.5680000036955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.661803 7.583146 7.475786 2.214052
0.190190 0.206588 0.181763 0.135818 [error]
Peak 0.550536 0.958809 0.891323 0.215203
0.036439 0.046450 0.043734 0.025468 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 74.160 -35.592 38.568
T90 28.720 -14.376 14.344
T50 6.912 0.632 7.544
Peak 1.000 2.844 3.844
====== 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 -1.508 -0.050 0.050 - - - 2.30e-02 -6.76e-04 6.76e-04 79.410 57
CPL -0.918 -0.224 0.236 107.860 -15.095 30.233 4.14e-02 -8.12e-03 1.06e-02 57.870 56
=== 1-s peak 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 -1.571 -0.083 0.083 - - - 1.98e-01 -1.04e-02 1.04e-02 75.140 57
CPL -0.866 -0.359 0.387 89.757 -14.502 36.263 4.22e-01 -1.32e-01 2.10e-01 63.260 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 2.19e-06 4.01e-06 5.64e-06 1.66e-05 1.61e-05 2.85e-05 erg/cm2
90%_error_low -1.27e-07 -1.42e-07 -1.85e-07 -1.17e-06 -4.77e-07 -1.27e-06 erg/cm2
90%_error_hi 1.30e-07 1.42e-07 1.84e-07 1.23e-06 4.76e-07 1.31e-06 erg/cm2
Peak flux PL 8.71e+00 8.41e+00 5.66e+00 5.96e+00 2.52e+01 2.87e+01 ph/cm2/s
90%_error_low -7.84e-01 -4.91e-01 -3.46e-01 -6.92e-01 -1.41e+00 -1.50e+00 ph/cm2/s
90%_error_hi 8.07e-01 4.89e-01 3.44e-01 7.37e-01 1.41e+00 1.50e+00 ph/cm2/s
Fluence CPL 1.87e-06 4.12e-06 6.03e-06 9.13e-06 1.58e-05 2.11e-05 erg/cm2
90%_error_low -1.65e-07 -1.55e-07 -2.36e-07 -1.69e-06 -4.96e-07 -1.72e-06 erg/cm2
90%_error_hi 1.70e-07 1.55e-07 2.38e-07 2.18e-06 4.94e-07 2.17e-06 erg/cm2
Peak flux CPL 7.41e+00 8.87e+00 6.23e+00 3.44e+00 2.46e+01 2.59e+01 ph/cm2/s
90%_error_low -9.72e-01 -5.60e-01 -4.51e-01 -8.22e-01 -1.43e+00 -1.70e+00 ph/cm2/s
90%_error_hi 1.00e+00 5.66e-01 4.58e-01 1.10e+00 1.44e+00 1.80e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 81.2999 -57.7587 0.0062 54.1344 -32.6376 24.0197680 30.785 TRIG_00106442 Foreground time interval of the image: -35.592 38.568 (delta_t = 74.160 [sec]) Background time interval of the image: -299.656 -35.592 (delta_t = 264.064 [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 -35.592 sec. to 38.568 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50801 ( -0.0502839 0.0503775 ) Norm@50keV : 2.29779E-02 ( -0.000676177 0.000675882 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 79.41 using 59 PHA bins. # Reduced chi-squared = 1.393 for 57 degrees of freedom # Null hypothesis probability = 2.656274e-02 Photon flux (15-150 keV) in 74.16 sec: 2.87483 ( -0.09747 0.09786 ) ph/cm2/s Energy fluence (15-150 keV) : 1.61466e-05 ( -4.76534e-07 4.76452e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.592 sec. to 38.568 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.918029 ( -0.224444 0.235741 ) Epeak [keV] : 107.860 ( -15.0945 30.2332 ) Norm@50keV : 4.14123E-02 ( -0.00812376 0.0106249 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.87 using 59 PHA bins. # Reduced chi-squared = 1.033 for 56 degrees of freedom # Null hypothesis probability = 4.059729e-01 Photon flux (15-150 keV) in 74.16 sec: 2.76374 ( -0.10397 0.10464 ) ph/cm2/s Energy fluence (15-150 keV) : 1.58395e-05 ( -4.95777e-07 4.9443e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.844 sec. to 3.844 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57056 ( -0.0833532 0.0826836 ) Norm@50keV : 0.197801 ( -0.0103594 0.0103554 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.14 using 59 PHA bins. # Reduced chi-squared = 1.318 for 57 degrees of freedom # Null hypothesis probability = 5.401131e-02 Photon flux (15-150 keV) in 1 sec: 25.1928 ( -1.4062 1.4091 ) ph/cm2/s Energy fluence (15-150 keV) : 1.85708e-06 ( -1.01058e-07 1.01223e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.844 sec. to 3.844 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.86645 ( -0.359258 0.387248 ) Epeak [keV] : 89.7569 ( -14.502 36.2626 ) Norm@50keV : 0.421750 ( -0.132345 0.209822 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.26 using 59 PHA bins. # Reduced chi-squared = 1.130 for 56 degrees of freedom # Null hypothesis probability = 2.354337e-01 Photon flux (15-150 keV) in 1 sec: 24.5671 ( -1.4321 1.4401 ) ph/cm2/s Energy fluence (15-150 keV) : 1.83493e-06 ( -1.03599e-07 1.03455e-07 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 28.72 sec. Hardness ratio (energy fluence ratio) = 1.46298552886
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.98976e-06 S(50-150 keV) = 9.849665e-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 = 1.164784773247364E+00, IMY = 7.459877691451905E-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: -299.656000 -35.592000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5170 -40.5458 0.6 23.3 6.5 3.2639 19.9 0.7 Vela X-1 170.1994 -60.6327 2.7 20.1 -79.0 0.7889 4.2 3.5 Cen X-3 186.4671 -62.7311 3.5 25.1 -95.4 0.7453 3.3 5.7 GX 301-2 207.2052 -54.8440 2.6 30.3 -121.9 0.9206 4.4 ------ UNKNOWN 119.2734 -81.0433 3.8 43.6 -64.1 2.6760 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -35.592000 38.568000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5087 -40.5363 1.8 23.3 6.5 0.7337 6.4 1.4 Vela X-1 170.0745 -60.6577 7.6 20.1 -78.9 -0.1989 -1.5 7.4 Cen X-3 187.0786 -62.8216 9.0 25.3 -95.8 0.1770 1.3 12.0 GX 301-2 223.0859 -21.1980 2.7 51.4 -168.0 0.8763 4.3 ------ UNKNOWN 81.2999 -57.7587 0.4 54.1 -32.6 24.0178 29.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: