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 00:58:20 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger441664
======================================================================
Trigger: 00441664 Segment: 000
BAT Trigger Time: 316020322.752 [s; MET]
Trigger Stop: 316020323.776 [s; MET]
UTC: 2011-01-06T15:25:16.214380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.2851643424613 Dec: 64.1838497908165 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 8.16
Analysis Position: [ source = BAT ]
RA: 79.2851643424613 Dec: 64.1838497908165 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 79.2888078543487 Dec: 64.1912658262473 [deg; J2000]
{ 05h 17m 09.3s , +64d 11' 28.6" }
+/- 2.20624127808641 [arcmin] (estimated 90% radius based on SNR)
+/- 0.841460715950811 [arcmin] (formal 1-sigma fit error)
SNR: 9.82167398914728
Angular difference between the analysis and refined position is 0.455030 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.751999974250793
to: 2.24800002574921 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: 0.248000025749207
to: 1.24800002574921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.248000025749207
to: 1.24800002574921 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.751999974250793
to: 2.24800002574921 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.092123 0.165090 0.086249 0.027852
0.020246 0.021144 0.018782 0.015295 [error]
Peak 0.038560 0.099632 0.049193 0.014236
0.011763 0.012928 0.011516 0.008839 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 3.000 -0.752 2.248
T90 3.000 -0.752 2.248
T50 1.000 0.248 1.248
Peak 1.000 0.248 1.248
====== 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 -1.569 -0.277 0.274 - - - 8.46e-03 -1.42e-03 1.41e-03 64.860 57
CPL -1.236 -1.164 1.267 110.936 -110.936 -110.936 1.27e-02 -5.23e-03 4.70e-02 64.560 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 -1.646 -0.313 0.303 - - - 1.28e-02 -2.59e-03 2.56e-03 70.850 57
CPL -0.636 -1.314 2.253 61.056 -14.318 -61.056 4.64e-02 -4.64e-02 9.69e-01 69.350 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 3.46e-08 6.09e-08 8.21e-08 2.28e-07 2.38e-07 4.05e-07 erg/cm2
90%_error_low -9.10e-09 -1.05e-08 -1.75e-08 -8.71e-08 -4.25e-08 -1.05e-07 erg/cm2
90%_error_hi 9.67e-09 1.04e-08 1.73e-08 1.17e-07 4.29e-08 1.27e-07 erg/cm2
Peak flux PL 6.08e-01 5.61e-01 3.59e-01 3.53e-01 1.67e+00 1.88e+00 ph/cm2/s
90%_error_low -1.75e-01 -1.11e-01 -8.92e-02 -1.45e-01 -3.25e-01 -3.61e-01 ph/cm2/s
90%_error_hi 1.87e-01 1.11e-01 8.83e-02 1.92e-01 3.26e-01 3.62e-01 ph/cm2/s
Fluence CPL 3.31e-08 6.36e-08 8.39e-08 1.35e-07 2.33e-07 3.16e-07 erg/cm2
90%_error_low -1.02e-08 -1.25e-08 -1.86e-08 -1.07e-07 -4.71e-08 -1.19e-07 erg/cm2
90%_error_hi 1.05e-08 1.39e-08 1.92e-08 2.20e-07 4.58e-08 1.34e-07 erg/cm2
Peak flux CPL 5.42e-01 6.36e-01 3.75e-01 1.17e-01 1.64e+00 1.67e+00 ph/cm2/s
90%_error_low -1.96e-01 -1.51e-01 -1.06e-01 -1.17e-01 -3.31e-01 -3.53e-01 ph/cm2/s
90%_error_hi 2.08e-01 1.72e-01 1.05e-01 3.00e-01 3.31e-01 4.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 79.2888 64.1913 0.0196 44.2350 173.5517 0.3888617 9.822 TRIG_00441664 Foreground time interval of the image: -0.752 2.248 (delta_t = 3.000 [sec]) Background time interval of the image: -515.551 -488.687 (delta_t = 26.864 [sec]) -239.752 -0.752 (delta_t = 239.000 [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 -0.752 sec. to 2.248 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56921 ( -0.277141 0.27414 ) Norm@50keV : 8.46202E-03 ( -0.00142392 0.00141301 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.86 using 59 PHA bins. # Reduced chi-squared = 1.138 for 57 degrees of freedom # Null hypothesis probability = 2.215323e-01 Photon flux (15-150 keV) in 3 sec: 1.07733 ( -0.181759 0.18227 ) ph/cm2/s Energy fluence (15-150 keV) : 2.38386e-07 ( -4.24743e-08 4.28694e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.752 sec. to 2.248 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23576 ( -1.1638 1.26694 ) Epeak [keV] : 110.936 ( -110.964 -110.964 ) Norm@50keV : 1.26831E-02 ( -0.00523268 0.0470166 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.56 using 59 PHA bins. # Reduced chi-squared = 1.153 for 56 degrees of freedom # Null hypothesis probability = 2.023061e-01 Photon flux (15-150 keV) in 3 sec: 1.06707 ( -0.184479 0.18488 ) ph/cm2/s Energy fluence (15-150 keV) : 2.32944e-07 ( -4.71417e-08 4.58229e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.248 sec. to 1.248 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64572 ( -0.312895 0.303448 ) Norm@50keV : 1.28451E-02 ( -0.00259323 0.00255811 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.85 using 59 PHA bins. # Reduced chi-squared = 1.243 for 57 degrees of freedom # Null hypothesis probability = 1.027483e-01 Photon flux (15-150 keV) in 1 sec: 1.67496 ( -0.32535 0.32597 ) ph/cm2/s Energy fluence (15-150 keV) : 1.19536e-07 ( -2.5106e-08 2.54046e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.248 sec. to 1.248 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.636088 ( -1.3142 2.25295 ) Epeak [keV] : 61.0558 ( -14.2979 -61.0359 ) Norm@50keV : 4.63920E-02 ( -0.0464481 0.96896 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.35 using 59 PHA bins. # Reduced chi-squared = 1.238 for 56 degrees of freedom # Null hypothesis probability = 1.084300e-01 Photon flux (15-150 keV) in 1 sec: 1.63868 ( -0.33078 0.33078 ) ph/cm2/s Energy fluence (15-150 keV) : 1.10838e-07 ( -2.91741e-08 2.85675e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.0 sec. Hardness ratio (energy fluence ratio) = 1.34803133556
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.552225e-08 S(50-150 keV) = 1.4286297e-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 = -9.674886340401854E-01, IMY = -1.093474487486454E-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: -515.551400 -488.687000 -239.752000 -0.752000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 101.1183 30.2729 2.2 40.4 118.2 3.8992 5.3 ------ UNKNOWN 160.3167 14.1197 2.3 29.9 8.7 1.1662 4.9 ------ UNKNOWN 165.6803 67.3611 2.9 26.2 -136.6 0.9062 4.0 ------ UNKNOWN 194.5105 -0.3249 3.6 58.7 -25.9 4.9541 3.2 ------ UNKNOWN 200.0597 13.6426 3.8 51.9 -42.2 3.6259 3.1 ------ UNKNOWN 205.9678 38.1128 3.0 42.3 -74.0 3.4147 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.752000 2.248000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 108.7013 43.9098 2.3 29.6 136.4 0.1363 4.9 ------ UNKNOWN 79.2888 64.1913 1.2 44.2 173.6 0.3888 9.8 ------ UNKNOWN 199.8807 43.7206 2.4 36.0 -79.8 0.1884 4.8 ------ UNKNOWN 217.8520 73.5540 2.7 43.4 -127.9 0.2160 4.3 ------ UNKNOWN 203.4457 43.2254 2.6 38.6 -80.3 0.2575 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 89.948610 162.348600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6444 22.0207 1.7 42.3 121.7 3.0729 6.9 0.7 Crab 138.6816 34.5345 2.7 46.1 48.1 2.2163 4.2 ------ UNKNOWN 117.5867 56.6089 2.4 20.0 42.0 0.5222 4.8 ------ UNKNOWN 51.0625 49.0457 2.2 21.4 -174.0 0.5239 5.2 ------ UNKNOWN 54.7942 55.7085 2.2 14.8 -166.0 0.4933 5.3 ------ UNKNOWN 38.2370 66.2748 2.1 17.0 -117.1 0.5402 5.5 ------ UNKNOWN 207.0103 52.4134 2.4 56.5 -17.0 1.8488 4.9 ------ UNKNOWN 217.5078 76.6975 2.3 36.7 -37.5 0.7066 4.9 ------ UNKNOWN 241.2071 63.0794 2.9 52.0 -42.1 2.2137 3.9 ------ UNKNOWN 0.6559 41.5585 2.6 48.6 -130.4 2.1207 4.5 ------ UNKNOWN