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 00:05:28 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
BAT Trigger Time: 153634289.0
UTC: 2005-11-14T04:11:29.161 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 226.273 Dec: 60.157 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 226.273 Dec: 60.157 [deg; J2000]
{ 15h 05m 05.5s , +60d 09' 25.2" }
+/- 2.14372183208 [arcmin] (estimated 90% radius based on SNR)
SNR: 10.2347547233
Angular difference between the analysis and refined position is 0.000000 arcmin
Partial Coding Fraction: 6.875000e-01 [ including projection effects ]
Duration
T90: 2. +/- 2.23606797749979
Measured from: 0
to: 2 [s; relative to TRIGTIME]
T50: 2. +/- 1.
Measured from: 0
to: 2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 3.000 0.000 3.000
T90 2.000 0.000 2.000
T50 2.000 0.000 2.000
Peak 1.000 0.000 1.000
====== 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 -1.250 -0.278 0.280 - - - 4.12e-03 -6.92e-04 6.91e-04 59.230 57
CPL 0.203 -1.320 1.942 76.775 -20.420 208.918 2.14e-02 -2.14e-02 1.63e-01 55.620 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 -1.162 -0.566 0.580 - - - 4.41e-03 -1.24e-03 1.24e-03 48.810 57
CPL -1.152 -0.575 0.580 9999.360 -9999.360 -9999.360 4.43e-03 -1.25e-03 2.39e-02 48.810 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 1.25e-08 2.67e-08 4.50e-08 1.73e-07 1.24e-07 2.57e-07 erg/cm2
90%_error_low -3.49e-09 -4.89e-09 -9.28e-09 -6.53e-08 -2.32e-08 -7.38e-08 erg/cm2
90%_error_hi 3.79e-09 4.82e-09 9.21e-09 8.87e-08 2.36e-08 9.37e-08 erg/cm2
Peak flux PL 1.31e-01 1.62e-01 1.45e-01 2.24e-01 5.15e-01 6.61e-01 ph/cm2/s
90%_error_low -6.83e-02 -5.64e-02 -5.09e-02 -1.34e-01 -1.47e-01 -1.98e-01 ph/cm2/s
90%_error_hi 8.28e-02 5.29e-02 4.82e-02 2.27e-01 1.48e-01 2.20e-01 ph/cm2/s
Fluence CPL 9.55e-09 3.04e-08 4.84e-08 3.37e-08 1.10e-07 1.22e-07 erg/cm2
90%_error_low -4.24e-09 -6.13e-09 -1.12e-08 -2.57e-08 -2.52e-08 -3.54e-08 erg/cm2
90%_error_hi 4.59e-09 6.52e-09 1.11e-08 1.08e-07 2.66e-08 1.07e-07 erg/cm2
Peak flux CPL 1.31e-01 1.62e-01 1.45e-01 2.22e-01 5.15e-01 6.94e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 226.273 60.157 0.000 26.708 151.532 0.190 10.235 TRIG_00163844 Image time interval: 0.000 to 3.000 [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 3.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25035 ( -0.277614 0.280287 ) Norm@50keV : 4.11638E-03 ( -0.000692123 0.000691141 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.23 using 59 PHA bins. # Reduced chi-squared = 1.039 for 57 degrees of freedom # Null hypothesis probability = 3.942777e-01 Photon flux (15-150 keV) in 3 sec: 0.486890 ( -0.08245 0.082614 ) ph/cm2/s Energy fluence (15-150 keV) : 1.23589e-07 ( -2.31739e-08 2.35879e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 3.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.203292 ( -1.3199 1.94204 ) Epeak [keV] : 76.7749 ( -20.4199 208.918 ) Norm@50keV : 2.14279E-02 ( -0.021428 0.162628 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.62 using 59 PHA bins. # Reduced chi-squared = 0.9931 for 56 degrees of freedom # Null hypothesis probability = 4.893438e-01 Photon flux (15-150 keV) in 3 sec: 0.456790 ( -0.087585 0.087447 ) ph/cm2/s Energy fluence (15-150 keV) : 1.1037e-07 ( -2.52266e-08 2.65577e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16163 ( -0.566233 0.580028 ) Norm@50keV : 4.41010E-03 ( -0.00123696 0.00123617 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.81 using 59 PHA bins. # Reduced chi-squared = 0.8563 for 57 degrees of freedom # Null hypothesis probability = 7.715375e-01 Photon flux (15-150 keV) in 1 sec: 0.515035 ( -0.147244 0.147679 ) ph/cm2/s Energy fluence (15-150 keV) : 4.5247e-08 ( -1.46274e-08 1.50048e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15237 ( -0.57413 0.580327 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 4.43210E-03 ( -0.00124577 0.0239026 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.81 using 59 PHA bins. # Reduced chi-squared = 0.8717 for 56 degrees of freedom # Null hypothesis probability = 7.410584e-01 Photon flux (15-150 keV) in 1 sec: 0.514982 ( ) ph/cm2/s Energy fluence (15-150 keV) : 4.53545e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -0.442289680644, IMY = -0.239824209065
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: -4.000000 16.022500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4573 35.3183 254.9 40.9 -157.2 -0.0030 -0.0 1.5 Her X-1 154.0188 14.1762 3.2 49.2 20.5 0.5795 3.6 ------ UNKNOWN 243.3434 36.2985 2.2 32.0 -154.2 0.2519 5.2 ------ UNKNOWN 255.5769 28.1314 2.2 44.6 -148.0 0.4165 5.3 ------ UNKNOWN 199.5556 -10.4217 1.9 48.4 -49.9 1.0871 6.0 ------ UNKNOWN 225.6570 2.7438 2.4 40.8 -90.5 0.7328 4.8 ------ UNKNOWN
Webpage updated on: Wed Oct 7 17:33:05 EDT 2015