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 18:42:02 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger180151
======================================================================
Trigger: 00180151 Segment: 000
BAT Trigger Time: 160703736 [s; MET]
Trigger Stop: 160703816 [s; MET]
UTC: 2006-02-03T23:55:35.005260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.51409528059 Dec: 71.8235796171824 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.16
Analysis Position: [ source = BAT ]
RA: 103.51409528059 Dec: 71.8235796171824 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 103.444578971282 Dec: 71.8402426505928 [deg; J2000]
{ 06h 53m 46.7s , +71d 50' 24.9" }
+/- 1.93771969723509 [arcmin] (estimated 90% radius based on SNR)
+/- 0.956190567123668 [arcmin] (formal 1-sigma fit error)
SNR: 11.8223205732805
Angular difference between the analysis and refined position is 1.640413 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 69.5240000188351 +/- 11.6385608860808
Measured from: -18.0040000081062
to: 51.5200000107288 [s; relative to TRIGTIME]
T50: 31.772000014782 +/- 11.9828681167701
Measured from: -3.25200000405312
to: 28.5200000107288 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 25.919999986887
to: 26.919999986887 [s; relative to TRIGTIME]
Total Fluence
Measured from: -22.1680000126362
to: 55.7360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.387158 0.468165 0.427117 0.166186
0.061980 0.064218 0.055188 0.046888 [error]
Peak 0.011803 0.030180 0.019191 0.006762
0.007252 0.007455 0.006224 0.005314 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 77.904 -22.168 55.736
T90 69.524 -18.004 51.520
T50 31.772 -3.252 28.520
Peak 1.000 25.920 26.920
====== 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 -1.601 -0.231 0.228 - - - 1.25e-03 -1.68e-04 1.66e-04 58.030 57
CPL -1.468 -0.362 1.102 198.845 -198.845 -198.845 1.46e-03 N/A N/A 57.980 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 -1.398 -0.468 0.500 - - - 4.69e-03 -1.42e-03 1.42e-03 59.570 57
CPL 0.474 -2.061 4.472 62.347 -21.281 -62.347 4.57e-02 -4.57e-02 1.63e+01 57.730 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 1.37e-07 2.37e-07 3.12e-07 8.36e-07 9.12e-07 1.52e-06 erg/cm2
90%_error_low -2.95e-08 -3.23e-08 -5.43e-08 -2.73e-07 -1.29e-07 -3.23e-07 erg/cm2
90%_error_hi 3.12e-08 3.20e-08 5.36e-08 3.48e-07 1.30e-07 3.80e-07 erg/cm2
Peak flux PL 1.75e-01 1.87e-01 1.42e-01 1.75e-01 5.70e-01 6.79e-01 ph/cm2/s
90%_error_low -8.67e-02 -6.66e-02 -4.79e-02 -9.33e-02 -1.83e-01 -2.06e-01 ph/cm2/s
90%_error_hi 1.02e-01 6.51e-02 4.74e-02 1.42e-01 1.86e-01 2.06e-01 ph/cm2/s
Fluence CPL 1.34e-07 2.40e-07 3.15e-07 6.91e-07 9.05e-07 1.38e-06 erg/cm2
90%_error_low -3.68e-08 -3.52e-08 -5.11e-08 -5.04e-07 -1.42e-07 -5.26e-07 erg/cm2
90%_error_hi 2.93e-08 4.13e-08 6.02e-08 2.09e-07 1.36e-07 2.49e-07 erg/cm2
Peak flux CPL 1.33e-01 2.29e-01 1.57e-01 3.24e-02 5.46e-01 5.51e-01 ph/cm2/s
90%_error_low -8.86e-02 -8.73e-02 N/A -3.24e-02 -1.81e-01 -1.85e-01 ph/cm2/s
90%_error_hi 1.12e-01 1.02e-01 N/A 1.99e-01 1.87e-01 2.43e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 103.4446 71.8402 0.0163 43.1515 -167.9841 1.5008103 11.822 TRIG_00180151 Foreground time interval of the image: -22.168 55.736 (delta_t = 77.904 [sec]) Background time interval of the image: -299.000 -22.168 (delta_t = 276.832 [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 -22.168 sec. to 55.736 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60138 ( -0.231438 0.227555 ) Norm@50keV : 1.25153E-03 ( -0.00016753 0.000166127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.03 using 59 PHA bins. # Reduced chi-squared = 1.018 for 57 degrees of freedom # Null hypothesis probability = 4.370189e-01 Photon flux (15-150 keV) in 77.9 sec: 0.160901 ( -0.021601 0.021687 ) ph/cm2/s Energy fluence (15-150 keV) : 9.11757e-07 ( -1.29342e-07 1.30338e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.168 sec. to 55.736 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46799 ( -0.35668 1.10762 ) Epeak [keV] : 198.845 ( -211.005 -211.005 ) Norm@50keV : 1.46101E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.98 using 59 PHA bins. # Reduced chi-squared = 1.035 for 56 degrees of freedom # Null hypothesis probability = 4.020508e-01 Photon flux (15-150 keV) in 77.9 sec: 0.160056 ( -0.022643 0.021888 ) ph/cm2/s Energy fluence (15-150 keV) : 9.04684e-07 ( -1.41889e-07 1.35637e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 25.920 sec. to 26.920 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39822 ( -0.467908 0.500285 ) Norm@50keV : 4.68575E-03 ( -0.00142214 0.00142178 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.57 using 59 PHA bins. # Reduced chi-squared = 1.045 for 57 degrees of freedom # Null hypothesis probability = 3.821454e-01 Photon flux (15-150 keV) in 1 sec: 0.570452 ( -0.183055 0.185963 ) ph/cm2/s Energy fluence (15-150 keV) : 4.52971e-08 ( -1.419e-08 1.4335e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.920 sec. to 26.920 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.473787 ( -2.08562 4.44713 ) Epeak [keV] : 62.3472 ( -20.8534 -61.9194 ) Norm@50keV : 4.57408E-02 ( -0.0481469 16.3326 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.73 using 59 PHA bins. # Reduced chi-squared = 1.031 for 56 degrees of freedom # Null hypothesis probability = 4.112807e-01 Photon flux (15-150 keV) in 1 sec: 0.545938 ( -0.180798 0.187202 ) ph/cm2/s Energy fluence (15-150 keV) : 3.97887e-08 ( -1.48433e-08 1.61845e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 69.524 sec. Hardness ratio (energy fluence ratio) = 1.31828662155
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.734268e-07 S(50-150 keV) = 5.383207e-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 = -9.169292814534188E-01, IMY = 1.951650647949089E-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: -299.000000 -22.168000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 158.5521 9.1502 2.9 40.7 71.5 2.8750 4.0 ------ UNKNOWN 73.9008 73.0586 2.3 51.2 -162.8 2.0403 5.1 ------ UNKNOWN 60.6138 66.0694 3.2 59.1 -166.1 4.2229 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -22.168000 55.736000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 103.8192 64.8346 2.5 44.1 -178.1 0.6644 4.6 ------ UNKNOWN 103.4432 71.8390 0.9 43.2 -168.0 1.6167 12.8 ------ UNKNOWN 230.6096 55.4271 2.4 33.0 -87.9 0.7177 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: