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 12:45:32 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger232683
======================================================================
Trigger: 00232683 Segment: 000
BAT Trigger Time: 181908490.304 [s; MET]
Trigger Stop: 181908491.328 [s; MET]
UTC: 2006-10-07T10:08:08.812840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 46.3175910410402 Dec: -50.4878550139145 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.62
Image Trigger?: NO
Rate S/N Ratio: 73.1846978541279 [ if not an image trigger ]
Image S/N Ratio: 15.62
Analysis Position: [ source = BAT ]
RA: 46.3175910410402 Dec: -50.4878550139145 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 46.3058254064013 Dec: -50.4948031374968 [deg; J2000]
{ 03h 05m 13.4s , -50d 29' 41.3" }
+/- 0.901511405342841 [arcmin] (estimated 90% radius based on SNR)
+/- 0.268897257817658 [arcmin] (formal 1-sigma fit error)
SNR: 35.2732276025779
Angular difference between the analysis and refined position is 0.612780 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 75.7360000014305 +/- 2.48255352208967
Measured from: 3.62800002098083
to: 79.3640000224113 [s; relative to TRIGTIME]
T50: 23.0160000026226 +/- 0.198715875951865
Measured from: 31.5600000023842
to: 54.5760000050068 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 45.1440000236034
to: 46.1440000236034 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.05599999427795
to: 248.288000017405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.075275 20.561754 21.858439 8.008755
0.112736 0.129654 0.129900 0.108045 [error]
Peak 0.292306 0.587193 0.773372 0.327645
0.009468 0.012733 0.015156 0.012774 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 252.344 -4.056 248.288
T90 75.736 3.628 79.364
T50 23.016 31.560 54.576
Peak 1.000 45.144 46.144
====== 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 -1.020 -0.023 0.023 - - - 1.66e-02 -2.28e-04 2.28e-04 27.930 57
CPL -1.014 -0.023 0.047 9997.890 -9997.890 -9997.890 1.67e-02 -2.11e-04 6.52e-04 28.270 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 -0.684 -0.046 0.046 - - - 1.27e-01 -3.22e-03 3.21e-03 43.400 57
CPL -0.595 -0.104 0.096 993.487 -993.487 -993.487 1.38e-01 -1.30e-02 6.63e-03 44.800 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 3.42e-06 8.44e-06 1.66e-05 8.15e-05 4.50e-05 1.10e-04 erg/cm2
90%_error_low -1.05e-07 -1.56e-07 -1.99e-07 -2.35e-06 -5.32e-07 -2.35e-06 erg/cm2
90%_error_hi 1.07e-07 1.56e-07 1.99e-07 2.40e-06 5.31e-07 2.39e-06 erg/cm2
Peak flux PL 1.69e-03 2.10e-02 2.14e-01 2.07e+01 9.64e-01 2.07e+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
Fluence CPL 3.41e-06 8.44e-06 1.67e-05 8.09e-05 4.50e-05 1.09e-04 erg/cm2
90%_error_low N/A -1.56e-07 N/A N/A -5.31e-07 N/A erg/cm2
90%_error_hi N/A 1.56e-07 N/A N/A 5.30e-07 N/A erg/cm2
Peak flux CPL 2.43e+00 3.96e+00 4.93e+00 1.25e+01 1.47e+01 2.33e+01 ph/cm2/s
90%_error_low -1.64e-01 -1.25e-01 -1.22e-01 -1.25e+00 -4.01e-01 -8.12e-01 ph/cm2/s
90%_error_hi 1.12e-01 1.23e-01 1.40e-01 -7.22e-02 3.73e-01 6.84e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 46.3058 -50.4948 0.0054 36.0550 109.7556 8.4119131 35.273 TRIG_00232683 Foreground time interval of the image: -4.056 14.797 (delta_t = 18.853 [sec]) Background time interval of the image: -35.403 -4.056 (delta_t = 31.347 [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 -4.056 sec. to 248.288 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02025 ( -0.0232508 0.0233575 ) Norm@50keV : 1.66048E-02 ( -0.000228442 0.000227482 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 27.93 using 59 PHA bins. # Reduced chi-squared = 0.4899 for 57 degrees of freedom # Null hypothesis probability = 9.995803e-01 Photon flux (15-150 keV) in 252.3 sec: 1.91391 ( -0.0277 0.02784 ) ph/cm2/s Energy fluence (15-150 keV) : 4.49861e-05 ( -5.32467e-07 5.31281e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.056 sec. to 248.288 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.01355 ( -0.0234432 0.0473298 ) Epeak [keV] : 9997.89 ( -9998.2 -9998.2 ) Norm@50keV : 1.66998E-02 ( -0.000210801 0.000652384 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 28.27 using 59 PHA bins. # Reduced chi-squared = 0.5048 for 56 degrees of freedom # Null hypothesis probability = 9.992693e-01 Photon flux (15-150 keV) in 252.3 sec: 1.91293 ( ) ph/cm2/s Energy fluence (15-150 keV) : 4.49798e-05 ( -5.31278e-07 5.30251e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 45.144 sec. to 46.144 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.684462 ( -0.0460264 0.0463159 ) Norm@50keV : 0.127101 ( -0.00322189 0.00320638 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.40 using 59 PHA bins. # Reduced chi-squared = 0.7614 for 57 degrees of freedom # Null hypothesis probability = 9.079452e-01 Photon flux (15-150 keV) in 1 sec: 0.964414 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.56257e-06 ( -4.17423e-08 4.17833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.144 sec. to 46.144 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.676081 ( -0.103495 0.0955801 ) Epeak [keV] : 9997.06 ( -9997.25 -9997.25 ) Norm@50keV : 0.128087 ( -0.00304655 0.0165454 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.47 using 59 PHA bins. # Reduced chi-squared = 0.7762 for 56 degrees of freedom # Null hypothesis probability = 8.891009e-01 Photon flux (15-150 keV) in 1 sec: 14.7176 ( -0.4006 0.3728 ) ph/cm2/s Energy fluence (15-150 keV) : 1.56426e-06 ( -4.75938e-08 4.34214e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 75.736 sec. Hardness ratio (energy fluence ratio) = 1.97215018197
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1862198e-05 S(50-150 keV) = 3.312366e-05
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 = -2.460731369944117E-01, IMY = -6.851610378352506E-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: -35.403400 -4.056000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.8050 -40.6144 0.0 39.8 -142.5 -0.1772 -2.1 13.1 Vela X-1 170.4489 -60.8005 3.2 25.3 -93.1 0.2376 3.6 11.3 Cen X-3 186.9068 -62.9431 0.0 26.4 -74.8 0.0144 0.2 12.4 GX 301-2 264.7078 -44.5086 5.4 55.3 -14.9 0.3970 2.1 3.8 4U 1735-44 92.0664 -37.4541 2.0 42.5 165.2 0.5243 5.8 ------ UNKNOWN 291.2513 -53.4222 2.3 47.4 7.9 0.5786 5.1 ------ UNKNOWN 145.2024 -56.2181 1.7 25.5 -125.8 0.4179 6.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.056000 14.796600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4501 -40.6888 25.6 39.7 -142.9 0.0381 0.4 8.8 Vela X-1 170.4342 -60.8155 0.0 25.3 -93.1 -0.1454 -2.0 12.1 Cen X-3 186.9121 -62.6405 14.6 26.7 -75.1 -0.0580 -0.8 10.5 GX 301-2 264.6212 -44.4497 11.4 55.4 -14.9 0.2156 1.0 5.2 4U 1735-44 46.3058 -50.4948 0.3 36.1 109.8 8.4113 35.3 ------ UNKNOWN 289.7856 -44.3441 2.4 56.4 6.7 2.1607 4.9 ------ UNKNOWN 179.4233 -69.0770 3.1 19.6 -74.4 0.2299 3.7 ------ UNKNOWN 135.2909 -25.1401 3.4 55.1 -145.3 1.0194 3.4 ------ UNKNOWN 153.8824 -36.8515 1.8 45.6 -122.7 1.4963 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 69.796600 962.772000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 46.3208 -50.4866 0.6 0.0 113.3 6.9142 18.0 ------ UNKNOWN 54.0792 -70.8733 3.5 20.7 -59.2 1.3857 3.2 ------ UNKNOWN