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: Thu Jun 25 15:40:34 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger100815
======================================================================
Trigger: 00100815 Segment: 000
BAT Trigger Time: 125786058.304 [s; MET]
Trigger Stop: 125786062.4 [s; MET]
UTC: 2004-12-26T20:34:18.976400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.7656401246817 Dec: 73.3212972392719 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 13.5646599662505 [ if not an image trigger ]
Image S/N Ratio: 6
Analysis Position: [ source = BAT ]
RA: 79.7656401246817 Dec: 73.3212972392719 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 79.550620384331 Dec: 73.3342688781834 [deg; J2000]
{ 05h 18m 12.1s , +73d 20' 03.4" }
+/- 2.14109328635309 [arcmin] (estimated 90% radius based on SNR)
+/- 0.944008895075323 [arcmin] (formal 1-sigma fit error)
SNR: 10.2513679841067
Angular difference between the analysis and refined position is 3.782240 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 8.2960000038147 +/- 1.87637204199079
Measured from: -0.972000002861023
to: 7.32400000095367 [s; relative to TRIGTIME]
T50: 3.97599999606609 +/- 1.6471223420031
Measured from: 1.59600000083447
to: 5.57199999690056 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.29999999701977
to: 4.29999999701977 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.59200000762939
to: 7.60799999535084 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.055887 0.102171 0.044500 0.041941
0.013040 0.013119 0.011309 0.009446 [error]
Peak 0.008452 0.016511 0.015540 0.005471
0.004322 0.004431 0.003938 0.003297 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 9.200 -1.592 7.608
T90 8.296 -0.972 7.324
T50 3.976 1.596 5.572
Peak 1.000 3.300 4.300
====== 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: N/A)
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 -1.272 -0.286 0.298 - - - 1.58e-03 -2.61e-04 2.60e-04 84.830 57
CPL -1.274 -0.282 0.305 9999.360 -9999.360 -9999.360 1.59e-03 -2.59e-04 4.70e-03 84.830 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.230 -0.461 0.478 - - - 2.93e-03 -8.12e-04 8.10e-04 74.470 57
CPL -0.073 -1.511 3.363 81.950 N/A N/A 1.14e-02 N/A N/A 73.410 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 1.50e-08 3.18e-08 5.27e-08 1.98e-07 1.45e-07 2.97e-07 erg/cm2
90%_error_low -4.39e-09 -5.85e-09 -1.08e-08 -7.57e-08 -2.66e-08 -8.50e-08 erg/cm2
90%_error_hi 4.69e-09 5.71e-09 1.07e-08 1.06e-07 2.71e-08 1.11e-07 erg/cm2
Peak flux PL 9.31e-02 1.10e-01 9.39e-02 1.36e-01 3.45e-01 4.33e-01 ph/cm2/s
90%_error_low -4.25e-02 -3.47e-02 -3.06e-02 -7.24e-02 -9.68e-02 -1.24e-01 ph/cm2/s
90%_error_hi 4.92e-02 3.39e-02 3.03e-02 1.13e-01 9.72e-02 1.31e-01 ph/cm2/s
Fluence CPL 1.51e-08 3.18e-08 5.25e-08 1.98e-07 1.46e-07 2.95e-07 erg/cm2
90%_error_low -4.58e-09 -5.84e-09 -1.06e-08 -1.60e-07 -3.18e-08 -1.64e-07 erg/cm2
90%_error_hi 4.72e-09 6.98e-09 1.11e-08 1.04e-07 2.66e-08 5.26e-08 erg/cm2
Peak flux CPL 7.63e-02 1.22e-01 1.01e-01 4.27e-02 3.30e-01 3.42e-01 ph/cm2/s
90%_error_low -4.89e-02 -4.12e-02 N/A -4.27e-02 -1.01e-01 -1.12e-01 ph/cm2/s
90%_error_hi 5.61e-02 4.59e-02 N/A 1.30e-01 1.01e-01 1.67e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 79.5506 73.3343 0.0186 11.9447 144.2393 0.2446122 10.251 TRIG_00100815 Foreground time interval of the image: -1.592 7.608 (delta_t = 9.200 [sec]) Background time interval of the image: -299.304 -1.592 (delta_t = 297.712 [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 -1.592 sec. to 7.608 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27154 ( -0.285916 0.297753 ) Norm@50keV : 1.58473E-03 ( -0.00026055 0.000260241 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 84.83 using 59 PHA bins. # Reduced chi-squared = 1.488 for 57 degrees of freedom # Null hypothesis probability = 9.819137e-03 Photon flux (15-150 keV) in 9.2 sec: 0.188109 ( -0.031514 0.031582 ) ph/cm2/s Energy fluence (15-150 keV) : 1.45117e-07 ( -2.66173e-08 2.70689e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.592 sec. to 7.608 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27382 ( -0.283547 0.3037 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 1.58842E-03 ( -0.000261534 0.00469614 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 84.83 using 59 PHA bins. # Reduced chi-squared = 1.515 for 56 degrees of freedom # Null hypothesis probability = 7.723500e-03 Photon flux (15-150 keV) in 9.2 sec: 0.187945 ( -0.031352 0.031727 ) ph/cm2/s Energy fluence (15-150 keV) : 1.45696e-07 ( -3.18314e-08 2.65656e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.300 sec. to 4.300 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22973 ( -0.460646 0.477737 ) Norm@50keV : 2.93011E-03 ( -0.000811603 0.000810468 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.47 using 59 PHA bins. # Reduced chi-squared = 1.306 for 57 degrees of freedom # Null hypothesis probability = 6.001742e-02 Photon flux (15-150 keV) in 1 sec: 0.345451 ( -0.096807 0.097197 ) ph/cm2/s Energy fluence (15-150 keV) : 2.94856e-08 ( -8.98248e-09 9.26246e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.300 sec. to 4.300 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0733601 ( -1.51066 3.36366 ) Epeak [keV] : 81.9501 ( ) Norm@50keV : 1.13735E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.41 using 59 PHA bins. # Reduced chi-squared = 1.311 for 56 degrees of freedom # Null hypothesis probability = 5.918275e-02 Photon flux (15-150 keV) in 1 sec: 0.329516 ( -0.1006 0.100776 ) ph/cm2/s Energy fluence (15-150 keV) : 2.65797e-08 ( -9.81638e-09 1.04713e-08 ) 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 = -1.716635139722556E-01, IMY = -1.236286553707032E-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: -299.304000 -1.592000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 93.9767 41.0617 2.7 39.8 95.5 3.2081 4.3 ------ UNKNOWN 53.7211 53.1709 0.3 34.8 144.5 13.5811 41.3 ------ UNKNOWN 323.1935 56.2820 2.9 44.4 -136.5 1.5351 4.0 ------ UNKNOWN 236.3190 55.2253 3.6 39.9 -66.3 1.8225 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.592000 7.608000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 79.5505 73.3343 1.1 11.9 144.2 0.2445 10.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: