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 19:02:42 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger176702
======================================================================
Trigger: 00176702 Segment: 000
BAT Trigger Time: 158572878.72 [s; MET]
Trigger Stop: 158572879.232 [s; MET]
UTC: 2006-01-10T08:01:17.773060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 72.740721621106 Dec: 28.3800293891184 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.92
Image Trigger?: NO
Rate S/N Ratio: 18.5202591774521 [ if not an image trigger ]
Image S/N Ratio: 7.92
Analysis Position: [ source = BAT ]
RA: 72.740721621106 Dec: 28.3800293891184 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 72.7386578133127 Dec: 28.4285627643664 [deg; J2000]
{ 04h 50m 57.3s , +28d 25' 42.8" }
+/- 0.737448770678398 [arcmin] (estimated 90% radius based on SNR)
+/- 0.238758501584685 [arcmin] (formal 1-sigma fit error)
SNR: 46.9972960001081
Angular difference between the analysis and refined position is 2.914039 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 21.33599999547 +/- 2.04848920027237
Measured from: 0.272000014781952
to: 21.608000010252 [s; relative to TRIGTIME]
T50: 7.74400001764297 +/- 0.746726173608233
Measured from: 2.71999999880791
to: 10.4640000164509 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.21999999880791
to: 2.21999999880791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.56400001049042
to: 26.5879999995232 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.788194 0.910125 0.676515 0.150426
0.028603 0.029857 0.025933 0.021294 [error]
Peak 0.055383 0.093891 0.079826 0.005713
0.005923 0.006409 0.005916 0.004569 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 28.152 -1.564 26.588
T90 21.336 0.272 21.608
T50 7.744 2.720 10.464
Peak 1.000 1.220 2.220
====== 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 -1.635 -0.074 0.074 - - - 5.72e-03 -2.23e-04 2.22e-04 37.370 57
CPL -1.592 -0.113 0.247 491.385 -491.375 -491.385 6.00e-03 -4.89e-04 1.81e-03 37.430 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.333 -0.125 0.125 - - - 1.62e-02 -1.26e-03 1.26e-03 69.170 57
CPL -0.257 -0.553 0.636 81.998 -14.488 34.696 5.57e-02 -2.57e-02 5.74e-02 56.770 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 2.33e-07 3.95e-07 5.09e-07 1.32e-06 1.50e-06 2.46e-06 erg/cm2
90%_error_low -1.65e-08 -1.62e-08 -2.64e-08 -1.47e-07 -6.20e-08 -1.65e-07 erg/cm2
90%_error_hi 1.69e-08 1.62e-08 2.63e-08 1.60e-07 6.22e-08 1.75e-07 erg/cm2
Peak flux PL 5.66e-01 6.30e-01 5.00e-01 6.57e-01 1.94e+00 2.35e+00 ph/cm2/s
90%_error_low -7.41e-02 -5.35e-02 -4.65e-02 -1.15e-01 -1.52e-01 -1.89e-01 ph/cm2/s
90%_error_hi 7.70e-02 5.32e-02 4.63e-02 1.29e-01 1.53e-01 1.90e-01 ph/cm2/s
Fluence CPL 2.33e-07 3.95e-07 5.09e-07 1.31e-06 1.50e-06 2.41e-06 erg/cm2
90%_error_low -2.09e-08 -1.61e-08 -2.49e-08 -4.45e-07 -7.03e-08 -4.12e-07 erg/cm2
90%_error_hi 1.26e-08 1.82e-08 2.77e-08 9.98e-08 6.17e-08 2.09e-07 erg/cm2
Peak flux CPL 4.64e-01 6.93e-01 5.45e-01 2.39e-01 1.87e+00 1.94e+00 ph/cm2/s
90%_error_low -8.81e-02 -6.49e-02 -5.51e-02 -9.28e-02 -1.57e-01 -1.84e-01 ph/cm2/s
90%_error_hi 9.10e-02 6.64e-02 5.60e-02 1.48e-01 1.57e-01 2.05e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 72.7387 28.4286 0.0041 24.1119 -177.4841 2.7492266 46.997 TRIG_00176702 Foreground time interval of the image: -1.564 26.588 (delta_t = 28.152 [sec]) Background time interval of the image: -299.720 -20.391 (delta_t = 279.329 [sec]) -19.720 -1.564 (delta_t = 18.156 [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 -1.564 sec. to 26.588 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63491 ( -0.0741497 0.0737026 ) Norm@50keV : 5.72016E-03 ( -0.00022302 0.000222264 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.37 using 59 PHA bins. # Reduced chi-squared = 0.6557 for 57 degrees of freedom # Null hypothesis probability = 9.793692e-01 Photon flux (15-150 keV) in 28.15 sec: 0.743267 ( -0.030291 0.030423 ) ph/cm2/s Energy fluence (15-150 keV) : 1.50013e-06 ( -6.19635e-08 6.21867e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.564 sec. to 26.588 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63301 ( -0.109799 0.250168 ) Epeak [keV] : 9996.98 ( -9996.9 -9996.91 ) Norm@50keV : 5.73271E-03 ( -0.000218944 0.00207839 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.37 using 59 PHA bins. # Reduced chi-squared = 0.6674 for 56 degrees of freedom # Null hypothesis probability = 9.738053e-01 Photon flux (15-150 keV) in 28.15 sec: 0.743099 ( -0.033537 0.030201 ) ph/cm2/s Energy fluence (15-150 keV) : 1.49989e-06 ( -7.02728e-08 6.16736e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.220 sec. to 2.220 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33251 ( -0.124822 0.125005 ) Norm@50keV : 1.61510E-02 ( -0.0012591 0.00125779 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.17 using 59 PHA bins. # Reduced chi-squared = 1.214 for 57 degrees of freedom # Null hypothesis probability = 1.294174e-01 Photon flux (15-150 keV) in 1 sec: 1.93891 ( -0.15239 0.15253 ) ph/cm2/s Energy fluence (15-150 keV) : 1.58391e-07 ( -1.36305e-08 1.37364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.220 sec. to 2.220 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.256594 ( -0.553008 0.635662 ) Epeak [keV] : 81.9978 ( -14.4884 34.696 ) Norm@50keV : 5.56859E-02 ( -0.0256913 0.0573806 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.77 using 59 PHA bins. # Reduced chi-squared = 1.014 for 56 degrees of freedom # Null hypothesis probability = 4.461748e-01 Photon flux (15-150 keV) in 1 sec: 1.86555 ( -0.15706 0.15708 ) ph/cm2/s Energy fluence (15-150 keV) : 1.47258e-07 ( -1.47293e-08 1.49081e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 21.336 sec. Hardness ratio (energy fluence ratio) = 1.28798244786
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.28371e-07 S(50-150 keV) = 8.717579e-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 = -4.471397921066536E-01, IMY = 1.964669167818170E-02
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: -299.720000 -20.391000 -19.720000 -1.564000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6286 22.0164 0.2 18.4 153.7 13.0136 58.4 0.3 Crab 110.0523 -4.9716 2.6 39.0 80.4 3.4005 4.5 ------ UNKNOWN 48.7583 8.1977 3.3 53.6 170.4 2.9568 3.5 ------ UNKNOWN 147.4127 32.8567 2.6 39.2 -7.3 1.3145 4.5 ------ UNKNOWN 130.2696 68.3913 3.2 39.3 -67.3 2.1264 3.6 ------ UNKNOWN 167.6182 57.5601 3.1 50.7 -44.4 5.2345 3.7 ------ UNKNOWN 48.3630 62.2864 2.8 43.8 -116.1 4.4785 4.2 ------ UNKNOWN 66.9471 69.8570 2.2 41.3 -100.8 5.8575 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.564000 26.588000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.4930 22.1230 4.1 18.4 154.2 -0.1618 -2.8 10.2 Crab 141.5631 2.6136 1.9 49.0 35.2 1.6786 6.1 ------ UNKNOWN 107.0108 14.7827 2.0 19.1 75.9 0.3680 5.8 ------ UNKNOWN 138.0651 22.5823 2.4 34.7 13.4 0.3613 4.8 ------ UNKNOWN 72.7387 28.4286 0.2 24.1 -177.5 2.7493 47.0 ------ UNKNOWN 107.4211 38.2186 2.3 7.8 -38.8 0.2549 5.0 ------ UNKNOWN 98.0203 41.1371 3.0 8.4 -96.3 0.2021 3.9 ------ UNKNOWN 59.6586 67.5792 2.3 41.8 -106.0 1.1995 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 117.980600 302.362400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 127.9704 1.8201 2.9 35.0 58.4 1.0373 4.0 ------ UNKNOWN 184.9147 -2.4513 2.5 49.7 -29.8 1.5411 4.6 ------ UNKNOWN