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 Jan 22 18:51:25 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger177533
======================================================================
Trigger: 00177533 Segment: 000
BAT Trigger Time: 159093448.192 [s; MET]
Trigger Stop: 159093464.576 [s; MET]
UTC: 2006-01-16T08:37:27.233480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.6992896947215 Dec: -5.4486871468953 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 10.4403065089106 [ if not an image trigger ]
Image S/N Ratio: 6.58
Analysis Position: [ source = BAT ]
RA: 84.6992896947215 Dec: -5.4486871468953 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 84.701028157119 Dec: -5.44075165544001 [deg; J2000]
{ 05h 38m 48.2s , -05d 26' 26.7" }
+/- 1.71143086121601 [arcmin] (estimated 90% radius based on SNR)
+/- 0.628663727296607 [arcmin] (formal 1-sigma fit error)
SNR: 14.117177230572
Angular difference between the analysis and refined position is 0.487321 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 104.831999987364 +/- 27.2568347520558
Measured from: -29.0480000078678
to: 75.783999979496 [s; relative to TRIGTIME]
T50: 31.055999994278 +/- 6.83722515012333
Measured from: 5.63999998569489
to: 36.6959999799728 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 36.3959999978542
to: 37.3959999978542 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.7360000014305
to: 78.6319999992847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.850017 1.214557 1.082156 0.432063
0.118445 0.122497 0.106289 0.089990 [error]
Peak 0.026129 0.060425 0.037927 0.017533
0.012039 0.012471 0.010513 0.008865 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 114.368 -35.736 78.632
T90 104.832 -29.048 75.784
T50 31.056 5.640 36.696
Peak 1.000 36.396 37.396
====== 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 -1.366 -0.171 0.173 - - - 2.15e-03 -2.15e-04 2.15e-04 59.050 57
CPL -0.934 -0.529 0.786 129.601 -53.691 -129.601 3.48e-03 -1.33e-03 4.69e-03 57.860 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 -1.454 -0.408 0.416 - - - 9.51e-03 -2.37e-03 2.37e-03 40.460 57
CPL -1.024 -1.394 2.042 117.025 -117.025 -117.025 1.56e-02 N/A N/A 40.230 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 2.77e-07 5.52e-07 8.57e-07 2.92e-06 2.39e-06 4.61e-06 erg/cm2
90%_error_low -4.99e-08 -6.25e-08 -1.04e-07 -7.04e-07 -2.58e-07 -7.84e-07 erg/cm2
90%_error_hi 5.26e-08 6.18e-08 1.03e-07 8.44e-07 2.60e-07 8.97e-07 erg/cm2
Peak flux PL 3.74e-01 3.87e-01 2.83e-01 3.32e-01 1.17e+00 1.38e+00 ph/cm2/s
90%_error_low -1.55e-01 -1.11e-01 -8.25e-02 -1.60e-01 -3.08e-01 -3.43e-01 ph/cm2/s
90%_error_hi 1.75e-01 1.08e-01 8.07e-02 2.26e-01 3.10e-01 3.44e-01 ph/cm2/s
Fluence CPL 2.55e-07 5.75e-07 8.88e-07 1.62e-06 2.33e-06 3.33e-06 erg/cm2
90%_error_low -6.00e-08 -7.23e-08 -1.16e-07 -9.19e-07 -2.82e-07 -9.52e-07 erg/cm2
90%_error_hi 6.18e-08 7.51e-08 1.19e-07 1.49e-06 2.79e-07 1.61e-06 erg/cm2
Peak flux CPL 3.47e-01 4.06e-01 2.97e-01 2.11e-01 1.16e+00 1.26e+00 ph/cm2/s
90%_error_low -1.78e-01 -1.24e-01 -9.25e-02 -2.11e-01 -3.10e-01 -3.76e-01 ph/cm2/s
90%_error_hi 1.93e-01 1.36e-01 1.00e-01 1.79e-01 3.12e-01 4.27e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 84.7010 -5.4408 0.0136 37.9331 127.9743 3.4115524 14.117 TRIG_00177533 Foreground time interval of the image: -35.736 66.509 (delta_t = 102.245 [sec]) Background time interval of the image: -299.192 -35.736 (delta_t = 263.456 [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 -35.736 sec. to 78.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36551 ( -0.170991 0.173006 ) Norm@50keV : 2.14768E-03 ( -0.000215434 0.000215371 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.05 using 59 PHA bins. # Reduced chi-squared = 1.036 for 57 degrees of freedom # Null hypothesis probability = 4.004280e-01 Photon flux (15-150 keV) in 114.4 sec: 0.259578 ( -0.027309 0.027395 ) ph/cm2/s Energy fluence (15-150 keV) : 2.39169e-06 ( -2.58274e-07 2.59651e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.736 sec. to 78.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.934283 ( -0.528769 0.785647 ) Epeak [keV] : 129.601 ( -53.6933 -129.603 ) Norm@50keV : 3.48331E-03 ( -0.00133253 0.0046907 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.86 using 59 PHA bins. # Reduced chi-squared = 1.033 for 56 degrees of freedom # Null hypothesis probability = 4.064454e-01 Photon flux (15-150 keV) in 114.4 sec: 0.254926 ( -0.028345 0.028339 ) ph/cm2/s Energy fluence (15-150 keV) : 2.32839e-06 ( -2.81544e-07 2.78696e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 36.396 sec. to 37.396 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45362 ( -0.408154 0.416391 ) Norm@50keV : 9.51113E-03 ( -0.00237426 0.00237201 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.46 using 59 PHA bins. # Reduced chi-squared = 0.7098 for 57 degrees of freedom # Null hypothesis probability = 9.522617e-01 Photon flux (15-150 keV) in 1 sec: 1.17320 ( -0.307831 0.3098 ) ph/cm2/s Energy fluence (15-150 keV) : 9.09662e-08 ( -2.38851e-08 2.40582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.396 sec. to 37.396 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02407 ( -1.39388 2.04189 ) Epeak [keV] : 117.025 ( -117.062 -117.062 ) Norm@50keV : 1.56449E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.23 using 59 PHA bins. # Reduced chi-squared = 0.7183 for 56 degrees of freedom # Null hypothesis probability = 9.445749e-01 Photon flux (15-150 keV) in 1 sec: 1.16164 ( -0.310204 0.31241 ) ph/cm2/s Energy fluence (15-150 keV) : 8.92421e-08 ( -2.54672e-08 2.48617e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 104.832 sec. Hardness ratio (energy fluence ratio) = 1.55242286247
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.285159e-07 S(50-150 keV) = 1.5632019e-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 = -4.795761723661797E-01, IMY = -6.143969452651807E-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: -299.192000 -35.736000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6358 22.0173 0.3 28.2 79.4 11.5839 40.3 0.2 Crab 68.2851 -7.1796 2.5 28.3 152.7 1.0351 4.7 ------ UNKNOWN 42.5425 -40.6336 4.6 59.0 -166.2 3.3180 2.5 ------ UNKNOWN 2.0507 42.9137 4.4 50.7 -44.5 2.9019 2.6 ------ UNKNOWN 12.9182 8.6580 4.4 40.9 -93.2 2.5777 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -35.736000 66.508590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7447 21.9106 7.8 28.3 79.6 -0.2498 -1.5 8.8 Crab 84.7010 -5.4408 0.8 37.9 128.0 3.4121 14.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 137.108620 302.879200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6308 22.0205 0.3 27.5 37.9 7.2393 41.3 0.4 Crab 63.9770 -46.5780 2.3 44.8 -119.9 3.1938 5.0 ------ UNKNOWN