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 GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script: hand-made scripts that follow steps in batgrbproduct
but without using TDRSS info
Process Start Time: Tue Sep 30 00:00:01 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
BAT Trigger Time: 286914670.4
UTC: 2010-02-03T18:31:04.903 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Refined Position: [ source = BAT pre-slew image ]
RA: 96.2445957655 Dec: 4.7885044376 [deg; J2000]
{ 06h 24m 58.7s , +04d 47' 18.6" }
+/- 2.34517639008 [arcmin] (estimated 90% radius based on SNR)
SNR: 9.00229075884
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: 3.984375e-01 [ including projection effects ]
Duration
T90: 11.2000000476837 +/- 1.6
Measured from: 0
to: 11.2 [s; relative to TRIGTIME]
T50: 6.40000003576279 +/- 1.6
Measured from: 1.6
to: 8 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 11.200 0.000 11.200
T90 11.200 0.000 11.200
T50 6.400 1.600 8.000
Peak 1.000 3.500 4.500
====== 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 -1.592 -0.364 0.349 - - - 2.67e-03 -5.74e-04 5.54e-04 35.300 57
CPL -1.587 -0.368 1.199 9998.870 -9998.870 -9998.870 2.68e-03 -5.79e-04 9.11e-03 35.300 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 -1.541 -0.594 0.558 - - - 4.77e-03 -1.77e-03 1.73e-03 61.280 57
CPL 0.625 -2.481 5.541 53.115 -17.593 -53.115 7.50e-02 -7.50e-02 1.71e+02 59.420 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 3.60e-08 6.25e-08 8.30e-08 2.25e-07 2.42e-07 4.06e-07 erg/cm2
90%_error_low -1.05e-08 -1.19e-08 -2.38e-08 -1.10e-07 -5.53e-08 -1.36e-07 erg/cm2
90%_error_hi 1.11e-08 1.19e-08 2.39e-08 1.67e-07 5.71e-08 1.83e-07 erg/cm2
Peak flux PL 2.04e-01 2.01e-01 1.38e-01 1.49e-01 6.02e-01 6.92e-01 ph/cm2/s
90%_error_low -9.92e-02 -7.06e-02 -6.22e-02 -9.85e-02 -2.07e-01 -2.41e-01 ph/cm2/s
90%_error_hi 1.12e-01 7.00e-02 6.31e-02 1.72e-01 2.07e-01 2.50e-01 ph/cm2/s
Fluence CPL 3.62e-08 6.20e-08 8.28e-08 2.35e-07 2.45e-07 4.09e-07 erg/cm2
90%_error_low N/A N/A N/A N/A -7.33e-08 -2.10e-07 erg/cm2
90%_error_hi N/A N/A N/A N/A 6.38e-08 1.10e-07 erg/cm2
Peak flux CPL 1.53e-01 2.53e-01 1.38e-01 1.62e-02 5.59e-01 5.60e-01 ph/cm2/s
90%_error_low -1.06e-01 -9.64e-02 -1.38e-01 -1.62e-02 -2.01e-01 -2.03e-01 ph/cm2/s
90%_error_hi 1.29e-01 1.06e-01 8.13e-02 1.80e-01 2.11e-01 2.64e-01 ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 96.245 4.789 0.021 28.430 88.557 0.496 9.002 TRIG_00411011 Image time interval: -0.400 to 9.670 [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.
Best duration plot
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 0.000 sec. to 9.670 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.59163 ( -0.363719 0.348936 ) Norm@50keV : 2.67327E-03 ( -0.000573817 0.00055428 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.30 using 59 PHA bins. # Reduced chi-squared = 0.6192 for 57 degrees of freedom # Null hypothesis probability = 9.894118e-01 Photon flux (15-150 keV) in 9.67 sec: 0.342655 ( -0.064913 0.064936 ) ph/cm2/s Energy fluence (15-150 keV) : 2.4204e-07 ( -5.52575e-08 5.70806e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 9.670 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58734 ( -0.366465 1.20099 ) Epeak [keV] : 9998.87 ( -9999.32 -9999.32 ) Norm@50keV : 2.68011E-03 ( -0.000578977 0.00910934 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.30 using 59 PHA bins. # Reduced chi-squared = 0.6303 for 56 degrees of freedom # Null hypothesis probability = 9.861919e-01 Photon flux (15-150 keV) in 9.67 sec: 0.343664 ( -0.066946 0.065092 ) ph/cm2/s Energy fluence (15-150 keV) : 2.45203e-07 ( -7.32831e-08 6.37598e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54135 ( -0.593533 0.558088 ) Norm@50keV : 4.77067E-03 ( -0.00177313 0.00172766 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.28 using 59 PHA bins. # Reduced chi-squared = 1.075 for 57 degrees of freedom # Null hypothesis probability = 3.252034e-01 Photon flux (15-150 keV) in 1 sec: 0.602462 ( -0.206721 0.206963 ) ph/cm2/s Energy fluence (15-150 keV) : 4.49697e-08 ( -1.74325e-08 1.8375e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.625287 ( -2.53228 5.48988 ) Epeak [keV] : 53.1150 ( -16.7357 -52.2581 ) Norm@50keV : 7.49946E-02 ( -0.0958584 171.094 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.42 using 59 PHA bins. # Reduced chi-squared = 1.061 for 56 degrees of freedom # Null hypothesis probability = 3.520756e-01 Photon flux (15-150 keV) in 1 sec: 0.558902 ( -0.201463 0.2112 ) ph/cm2/s Energy fluence (15-150 keV) : 3.69114e-08 ( -1.50876e-08 2.01431e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.2 sec. Hardness ratio (energy fluence ratio) = 1.32721087641
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.848194e-08 S(50-150 keV) = 1.4355922e-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 = 0.0136352489269, IMY = -0.54120417802
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: -0.400000 9.670000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6363 22.0402 2.0 34.2 48.7 0.3469 5.8 1.6 Crab 96.2445 4.7884 1.3 28.4 88.6 0.4954 9.0 ------ UNKNOWN 84.3482 -42.9769 2.1 34.5 -166.9 0.2078 5.6 ------ UNKNOWN
Webpage updated on: Sun Jun 21 01:15:41 EDT 2015