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: Mon Jan 13 16:55:47 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger510649
======================================================================
Trigger: 00510649 Segment: 000
BAT Trigger Time: 346779891.328 [s; MET]
Trigger Stop: 346779895.424 [s; MET]
UTC: 2011-12-28T15:44:43.604140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.079150215553 Dec: 18.2930458291051 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.28
Image Trigger?: NO
Rate S/N Ratio: 16.8226038412607 [ if not an image trigger ]
Image S/N Ratio: 11.28
Analysis Position: [ source = BAT ]
RA: 150.079150215553 Dec: 18.2930458291051 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 150.063406629793 Dec: 18.2839902929703 [deg; J2000]
{ 10h 00m 15.2s , +18d 17' 02.4" }
+/- 1.36453502228945 [arcmin] (estimated 90% radius based on SNR)
+/- 0.498353257920842 [arcmin] (formal 1-sigma fit error)
SNR: 19.5111610243057
Angular difference between the analysis and refined position is 1.048638 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 101.243999898434 +/- 5.44842881534183
Measured from: 0.860000014305115
to: 102.103999912739 [s; relative to TRIGTIME]
T50: 47.1199999451637 +/- 0.621288984982854
Measured from: 47.5479999780655
to: 94.6679999232292 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 54.555999994278
to: 55.555999994278 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.8199999928474
to: 115.427999973297 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.759982 5.890567 2.947174 0.441440
0.106460 0.107641 0.094899 0.083936 [error]
Peak 0.413764 0.527503 0.345156 0.062634
0.016230 0.017633 0.014891 0.010123 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 128.248 -12.820 115.428
T90 101.244 0.860 102.104
T50 47.120 47.548 94.668
Peak 1.000 54.556 55.556
====== 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 -2.221 -0.062 0.061 - - - 6.84e-03 -2.12e-04 2.11e-04 59.680 57
CPL -1.994 1.994 1.994 1.367 -0.318 0.556 8.79e-03 -3.72e-04 5.69e-04 61.600 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 -1.834 -0.076 0.075 - - - 8.76e-02 -3.73e-03 3.72e-03 53.620 57
CPL -1.644 -0.241 0.296 93.714 -34.045 -93.714 1.09e-01 -2.41e-02 4.35e-02 52.280 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 2.21e-06 2.63e-06 2.26e-06 3.30e-06 8.27e-06 1.04e-05 erg/cm2
90%_error_low -1.13e-07 -7.41e-08 -1.01e-07 -3.13e-07 -2.29e-07 -3.88e-07 erg/cm2
90%_error_hi 1.16e-07 7.40e-08 1.01e-07 3.35e-07 2.30e-07 4.01e-07 erg/cm2
Peak flux PL 4.97e+00 4.11e+00 2.31e+00 1.91e+00 1.22e+01 1.33e+01 ph/cm2/s
90%_error_low -3.52e-01 -1.78e-01 -1.26e-01 -2.07e-01 -5.34e-01 -5.42e-01 ph/cm2/s
90%_error_hi 3.61e-01 1.77e-01 1.26e-01 2.21e-01 5.36e-01 5.43e-01 ph/cm2/s
Fluence CPL 2.10e-06 2.61e-06 2.26e-06 2.03e-06 8.06e-06 9.44e-06 erg/cm2
90%_error_low -6.83e-08 -2.79e-08 -8.59e-08 3.12e-08 -1.98e-07 -4.22e-07 erg/cm2
90%_error_hi 8.77e-08 1.25e-07 1.17e-07 7.46e-07 2.81e-07 5.11e-07 erg/cm2
Peak flux CPL 4.79e+00 4.17e+00 2.34e+00 1.54e+00 1.21e+01 1.28e+01 ph/cm2/s
90%_error_low -4.31e-01 -2.00e-01 -1.36e-01 -4.16e-01 -5.71e-01 -7.52e-01 ph/cm2/s
90%_error_hi 4.40e-01 2.03e-01 1.38e-01 4.53e-01 5.72e-01 8.18e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 150.0634 18.2840 0.0099 41.3190 13.0057 3.3234719 19.511 TRIG_00510649 Foreground time interval of the image: -12.820 40.573 (delta_t = 53.393 [sec]) Background time interval of the image: -239.328 -12.820 (delta_t = 226.508 [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 -12.820 sec. to 115.428 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.22061 ( -0.0620512 0.0613036 ) Norm@50keV : 6.84058E-03 ( -0.000212105 0.000210881 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.68 using 59 PHA bins. # Reduced chi-squared = 1.047 for 57 degrees of freedom # Null hypothesis probability = 3.783704e-01 Photon flux (15-150 keV) in 128.2 sec: 1.14501 ( -0.03727 0.03759 ) ph/cm2/s Energy fluence (15-150 keV) : 8.27176e-06 ( -2.29315e-07 2.29593e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.820 sec. to 115.428 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.9939 ( 1.9939 1.9939 ) Epeak [keV] : 1.36704 ( -0.318416 0.555774 ) Norm@50keV : 8.78820E-03 ( -0.000371905 0.000569178 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.60 using 59 PHA bins. # Reduced chi-squared = 1.100 for 56 degrees of freedom # Null hypothesis probability = 2.826166e-01 Photon flux (15-150 keV) in 128.2 sec: 1.11201 ( -0.02867 0.03579 ) ph/cm2/s Energy fluence (15-150 keV) : 8.05858e-06 ( -1.97752e-07 2.80503e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 54.556 sec. to 55.556 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83354 ( -0.0755567 0.0747641 ) Norm@50keV : 8.76024E-02 ( -0.00373315 0.0037189 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.62 using 59 PHA bins. # Reduced chi-squared = 0.9407 for 57 degrees of freedom # Null hypothesis probability = 6.025669e-01 Photon flux (15-150 keV) in 1 sec: 12.2327 ( -0.5344 0.5358 ) ph/cm2/s Energy fluence (15-150 keV) : 8.05842e-07 ( -3.4619e-08 3.47205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 54.556 sec. to 55.556 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64395 ( -0.241192 0.295882 ) Epeak [keV] : 93.7143 ( -34.0449 -93.7145 ) Norm@50keV : 0.109152 ( -0.0241208 0.043464 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.28 using 59 PHA bins. # Reduced chi-squared = 0.9337 for 56 degrees of freedom # Null hypothesis probability = 6.162964e-01 Photon flux (15-150 keV) in 1 sec: 12.0910 ( -0.5708 0.5724 ) ph/cm2/s Energy fluence (15-150 keV) : 7.95152e-07 ( -3.81448e-08 3.79919e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 101.244 sec. Hardness ratio (energy fluence ratio) = 0.858242471651
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.844414e-06 S(50-150 keV) = 3.427248e-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 = 8.565586181937285E-01, IMY = -1.978418512008792E-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: -239.328000 -12.820000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6410 22.0135 0.3 26.7 145.6 9.2785 34.0 0.4 Crab 127.8268 78.3131 2.8 40.8 -88.1 4.8447 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -12.820000 40.572590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.5589 22.1247 12.5 26.7 145.9 0.1111 0.9 7.8 Crab 63.4992 8.2395 2.1 50.3 151.2 2.5296 5.6 ------ UNKNOWN 150.0634 18.2840 0.6 41.3 13.0 3.3234 19.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 132.972600 962.732800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 131.7109 -30.4594 3.0 51.8 5.0 5.5424 3.9 ------ UNKNOWN