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 00:24:10 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger444912
======================================================================
Trigger: 00444912 Segment: 000
BAT Trigger Time: 318770246.656 [s; MET]
Trigger Stop: 318770246.72 [s; MET]
UTC: 2011-02-07T11:17:20.015680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 12.5424372427686 Dec: -10.8057018983402 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 15.5884572681199 [ if not an image trigger ]
Image S/N Ratio: 7.39
Analysis Position: [ source = BAT ]
RA: 12.5424372427686 Dec: -10.8057018983402 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 12.5428354271555 Dec: -10.7939290626074 [deg; J2000]
{ 00h 50m 10.3s , -10d 47' 38.1" }
+/- 1.21996156865598 [arcmin] (estimated 90% radius based on SNR)
+/- 0.402178486200574 [arcmin] (formal 1-sigma fit error)
SNR: 22.8963754292715
Angular difference between the analysis and refined position is 0.706760 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 82.5799999833107 +/- 10.8304341416461
Measured from: 0.335999965667725
to: 82.9159999489784 [s; relative to TRIGTIME]
T50: 28.3679999113083 +/- 8.39066149751195
Measured from: 17.972000002861
to: 46.3399999141693 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.110000014305115
to: 0.889999985694885 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0879999995231628
to: 95.7960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.565433 0.941034 0.671875 0.187425
0.046853 0.049742 0.046855 0.047542 [error]
Peak 0.034644 0.053797 0.039254 0.030237
0.005192 0.005783 0.005643 0.005424 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 95.884 -0.088 95.796
T90 82.580 0.336 82.916
T50 28.368 17.972 46.340
Peak 1.000 -0.110 0.890
====== 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: 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 -1.299 -0.117 0.117 - - - 1.62e-03 -1.03e-04 1.03e-04 72.620 57
CPL -1.170 -0.232 0.468 323.340 -323.340 -323.340 1.88e-03 -3.51e-04 1.30e-03 72.360 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 -1.067 -0.229 0.236 - - - 9.45e-03 -1.12e-03 1.12e-03 72.820 57
CPL -1.079 -0.215 0.265 9999.350 -9999.350 -9999.350 9.49e-03 N/A N/A 72.870 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 1.64e-07 3.41e-07 5.54e-07 2.02e-06 1.53e-06 3.08e-06 erg/cm2
90%_error_low -1.88e-08 -2.33e-08 -4.59e-08 -3.52e-07 -1.13e-07 -3.87e-07 erg/cm2
90%_error_hi 1.94e-08 2.32e-08 4.59e-08 4.03e-07 1.14e-07 4.31e-07 erg/cm2
Peak flux PL 2.57e-01 3.35e-01 3.20e-01 5.42e-01 1.09e+00 1.45e+00 ph/cm2/s
90%_error_low -6.15e-02 -4.87e-02 -4.62e-02 -1.57e-01 -1.31e-01 -1.97e-01 ph/cm2/s
90%_error_hi 6.57e-02 4.72e-02 4.53e-02 1.99e-01 1.31e-01 2.10e-01 ph/cm2/s
Fluence CPL 1.60e-07 3.45e-07 5.58e-07 1.63e-06 1.51e-06 2.69e-06 erg/cm2
90%_error_low -2.22e-08 -2.65e-08 -4.77e-08 -8.14e-07 -1.32e-07 -8.20e-07 erg/cm2
90%_error_hi 1.85e-08 2.78e-08 4.86e-08 4.81e-07 1.24e-07 5.14e-07 erg/cm2
Peak flux CPL 2.57e-01 3.35e-01 3.20e-01 5.38e-01 1.09e+00 1.46e+00 ph/cm2/s
90%_error_low -6.17e-02 -4.89e-02 -4.63e-02 N/A -1.30e-01 -2.40e-01 ph/cm2/s
90%_error_hi 6.57e-02 4.69e-02 4.54e-02 N/A 1.31e-01 2.00e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 12.5428 -10.7939 0.0084 14.3877 -34.9708 2.5619690 22.896 TRIG_00444912 Foreground time interval of the image: -0.088 95.796 (delta_t = 95.884 [sec]) Background time interval of the image: -322.155 -315.557 (delta_t = 6.598 [sec]) -239.656 -0.088 (delta_t = 239.568 [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 -0.088 sec. to 95.796 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29885 ( -0.116711 0.116978 ) Norm@50keV : 1.61608E-03 ( -0.000103173 0.000102852 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.62 using 59 PHA bins. # Reduced chi-squared = 1.274 for 57 degrees of freedom # Null hypothesis probability = 7.952301e-02 Photon flux (15-150 keV) in 95.88 sec: 0.192764 ( -0.012287 0.012296 ) ph/cm2/s Energy fluence (15-150 keV) : 1.53179e-06 ( -1.12574e-07 1.13788e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 95.796 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17006 ( -0.23221 0.467696 ) Epeak [keV] : 323.340 ( -323.359 -323.359 ) Norm@50keV : 1.87564E-03 ( -0.000350786 0.00130162 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.36 using 59 PHA bins. # Reduced chi-squared = 1.292 for 56 degrees of freedom # Null hypothesis probability = 6.967059e-02 Photon flux (15-150 keV) in 95.88 sec: 0.191380 ( -0.013121 0.013067 ) ph/cm2/s Energy fluence (15-150 keV) : 1.51161e-06 ( -1.32085e-07 1.2381e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.110 sec. to 0.890 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0667 ( -0.229148 0.236045 ) Norm@50keV : 9.44505E-03 ( -0.0011187 0.00111868 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.82 using 59 PHA bins. # Reduced chi-squared = 1.277 for 57 degrees of freedom # Null hypothesis probability = 7.721667e-02 Photon flux (15-150 keV) in 1 sec: 1.09230 ( -0.130771 0.13092 ) ph/cm2/s Energy fluence (15-150 keV) : 9.98367e-08 ( -1.40045e-08 1.42145e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.110 sec. to 0.890 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06263 ( -0.215859 0.263919 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 9.49666E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.86 using 59 PHA bins. # Reduced chi-squared = 1.301 for 56 degrees of freedom # Null hypothesis probability = 6.450376e-02 Photon flux (15-150 keV) in 1 sec: 1.09204 ( -0.129695 0.13084 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00485e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 2.102093911011948E-01, IMY = 1.470308664916008E-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: -322.155390 -315.557200 -239.656000 -0.088000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 61.8266 -18.7479 2.6 35.7 110.4 2.0197 4.4 ------ UNKNOWN 36.8664 -77.4087 2.8 57.6 -167.3 4.0244 4.1 ------ UNKNOWN 353.5008 -25.8241 2.7 28.5 -91.2 1.1999 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.088000 95.796000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 12.5428 -10.7939 0.5 14.4 -35.0 2.5619 22.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 1049.844600 1059.449900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6751 22.0257 0.9 25.1 139.6 0.4351 12.3 2.4 Crab 55.9853 41.4420 3.4 10.9 -111.4 0.0985 3.4 ------ UNKNOWN 48.5340 15.4907 2.3 34.4 -150.7 0.1915 5.1 ------ UNKNOWN 35.8685 -1.3182 1.9 55.1 -146.3 1.0127 5.9 ------ UNKNOWN