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: Tue Jan 14 00:29:18 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger444643
======================================================================
Trigger: 00444643 Segment: 000
BAT Trigger Time: 318564168 [s; MET]
Trigger Stop: 318564232 [s; MET]
UTC: 2011-02-05T02:02:41.367420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.588577929917 Dec: 67.5160714352078 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.04
Analysis Position: [ source = BAT ]
RA: 164.588577929917 Dec: 67.5160714352078 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 164.604035535156 Dec: 67.5319128004809 [deg; J2000]
{ 10h 58m 25.0s , +67d 31' 54.9" }
+/- 2.19279854264686 [arcmin] (estimated 90% radius based on SNR)
+/- 0.9214186084597 [arcmin] (formal 1-sigma fit error)
SNR: 9.90780228776275
Angular difference between the analysis and refined position is 1.014461 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 249.415999948978 +/- 15.0347185018493
Measured from: 35.688000023365
to: 285.103999972343 [s; relative to TRIGTIME]
T50: 103.427999913692 +/- 6.25424652328269
Measured from: 115.276000022888
to: 218.703999936581 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 210.439999997616
to: 211.439999997616 [s; relative to TRIGTIME]
Total Fluence
Measured from: -130.15600001812
to: 377.231999993324 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.410523 10.143950 7.020187 1.572839
0.154099 0.160031 0.141811 0.124900 [error]
Peak 0.102615 0.143083 0.128223 0.038884
0.005912 0.006797 0.006422 0.004809 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 507.388 -130.156 377.232
T90 249.416 35.688 285.104
T50 103.428 115.276 218.704
Peak 1.000 210.440 211.440
====== 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 -1.672 -0.045 0.045 - - - 3.36e-03 -7.48e-05 7.48e-05 42.140 57
CPL -1.588 -0.127 0.178 263.330 -168.101 -263.330 3.68e-03 -3.73e-04 7.47e-04 41.460 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 -1.344 -0.091 0.090 - - - 2.60e-02 -1.34e-03 1.33e-03 70.560 57
CPL -1.226 -0.165 0.344 343.668 -343.668 -343.668 2.97e-02 -4.82e-03 1.34e-02 70.170 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 2.56e-06 4.23e-06 5.32e-06 1.33e-05 1.58e-05 2.54e-05 erg/cm2
90%_error_low -1.16e-07 -1.08e-07 -1.53e-07 -8.68e-07 -3.64e-07 -9.46e-07 erg/cm2
90%_error_hi 1.18e-07 1.08e-07 1.53e-07 9.10e-07 3.65e-07 9.78e-07 erg/cm2
Peak flux PL 9.20e-01 1.02e+00 8.01e-01 1.04e+00 3.12e+00 3.78e+00 ph/cm2/s
90%_error_low -8.45e-02 -5.74e-02 -5.10e-02 -1.33e-01 -1.62e-01 -2.01e-01 ph/cm2/s
90%_error_hi 8.70e-02 5.70e-02 5.07e-02 1.45e-01 1.62e-01 2.02e-01 ph/cm2/s
Fluence CPL 2.51e-06 4.25e-06 5.34e-06 1.18e-05 1.57e-05 2.39e-05 erg/cm2
90%_error_low -1.54e-07 -1.14e-07 -1.63e-07 -2.49e-06 -4.26e-07 -2.53e-06 erg/cm2
90%_error_hi 1.36e-07 1.15e-07 1.65e-07 1.70e-06 4.24e-07 1.84e-06 erg/cm2
Peak flux CPL 8.98e-01 1.03e+00 8.10e-01 9.05e-01 3.11e+00 3.64e+00 ph/cm2/s
90%_error_low -1.03e-01 -6.32e-02 -5.57e-02 -2.85e-01 -1.68e-01 -3.38e-01 ph/cm2/s
90%_error_hi 8.66e-02 6.42e-02 5.78e-02 1.74e-01 1.68e-01 3.16e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 164.6040 67.5319 0.0194 43.2174 160.0189 2.7603191 9.908 TRIG_00444643 Foreground time interval of the image: -70.099 72.101 (delta_t = 142.200 [sec]) Background time interval of the image:
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 -130.156 sec. to 377.232 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.6719 ( -0.0447628 0.0446708 ) Norm@50keV : 3.36028E-03 ( -7.48361e-05 7.48079e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.14 using 59 PHA bins. # Reduced chi-squared = 0.7393 for 57 degrees of freedom # Null hypothesis probability = 9.293805e-01 Photon flux (15-150 keV) in 507.4 sec: 0.442009 ( -0.011309 0.011358 ) ph/cm2/s Energy fluence (15-150 keV) : 1.58264e-05 ( -3.64193e-07 3.64516e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -130.156 sec. to 377.232 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58775 ( -0.126684 0.178412 ) Epeak [keV] : 263.330 ( -168.116 -263.345 ) Norm@50keV : 3.67535E-03 ( -0.000372909 0.000746841 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.46 using 59 PHA bins. # Reduced chi-squared = 0.7403 for 56 degrees of freedom # Null hypothesis probability = 9.265804e-01 Photon flux (15-150 keV) in 507.4 sec: 0.438594 ( -0.01315 0.013177 ) ph/cm2/s Energy fluence (15-150 keV) : 1.5717e-05 ( -4.2621e-07 4.24353e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 210.440 sec. to 211.440 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34395 ( -0.0906578 0.0903612 ) Norm@50keV : 2.59702E-02 ( -0.00133643 0.00133336 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.56 using 59 PHA bins. # Reduced chi-squared = 1.238 for 57 degrees of freedom # Null hypothesis probability = 1.070158e-01 Photon flux (15-150 keV) in 1 sec: 3.12483 ( -0.16157 0.16168 ) ph/cm2/s Energy fluence (15-150 keV) : 2.54021e-07 ( -1.47555e-08 1.48352e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 210.440 sec. to 211.440 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2255 ( -0.164665 0.344064 ) Epeak [keV] : 343.668 ( -343.668 -343.668 ) Norm@50keV : 2.96585E-02 ( -0.0048217 0.013437 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.17 using 59 PHA bins. # Reduced chi-squared = 1.253 for 56 degrees of freedom # Null hypothesis probability = 9.639663e-02 Photon flux (15-150 keV) in 1 sec: 3.10801 ( -0.1678 0.16771 ) ph/cm2/s Energy fluence (15-150 keV) : 2.51971e-07 ( -1.58579e-08 1.57917e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 249.416 sec. Hardness ratio (energy fluence ratio) = 1.25539395205
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.792859e-06 S(50-150 keV) = 9.033465e-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 = -8.830734206158953E-01, IMY = -3.210823008819084E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -70.099400 72.100590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 164.6040 67.5319 1.2 43.2 160.0 2.7606 9.9 ------ UNKNOWN 224.4769 68.4620 2.1 44.2 -168.6 1.0187 5.4 ------ UNKNOWN 208.9218 -17.0861 2.9 47.4 -23.8 0.9375 4.0 ------ UNKNOWN 227.6408 -5.8971 3.1 47.0 -53.1 2.0315 3.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 144.100620 963.064900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 100.3056 64.2813 3.7 25.3 172.2 1.3325 3.1 ------ UNKNOWN 164.6177 67.5279 0.2 0.0 -158.5 19.4882 48.2 ------ UNKNOWN 227.7389 25.3580 3.0 56.5 -16.6 6.3797 3.8 ------ UNKNOWN