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 22:11:42 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger454473
======================================================================
Trigger: 00454473 Segment: 000
BAT Trigger Time: 328462269.696 [s; MET]
Trigger Stop: 328462277.888 [s; MET]
UTC: 2011-05-30T15:31:02.689700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.044970301811 Dec: 61.9318358067532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.75
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 9.75
Analysis Position: [ source = BAT ]
RA: 282.044970301811 Dec: 61.9318358067532 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 282.031262557192 Dec: 61.9277373575728 [deg; J2000]
{ 18h 48m 07.5s , +61d 55' 39.9" }
+/- 1.9741407963206 [arcmin] (estimated 90% radius based on SNR)
+/- 0.794552005179749 [arcmin] (formal 1-sigma fit error)
SNR: 11.5119695502124
Angular difference between the analysis and refined position is 0.458530 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 55.7280000448227 +/- 12.5300432424269
Measured from: -40.6719999909401
to: 15.0560000538826 [s; relative to TRIGTIME]
T50: 26.5440000295639 +/- 12.2332320748672
Measured from: -19.7439999580383
to: 6.80000007152557 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.02799999713898
to: 2.02799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -48.8639999628067
to: 17.37600004673 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.325218 0.369513 0.194481 0.067504
0.043281 0.044643 0.039845 0.035811 [error]
Peak 0.015274 0.017289 0.019892 0.002273
0.005710 0.005579 0.005013 0.004416 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 66.240 -48.864 17.376
T90 55.728 -40.672 15.056
T50 26.544 -19.744 6.800
Peak 1.000 1.028 2.028
====== 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 -1.869 -0.287 0.269 - - - 7.97e-04 -1.46e-04 1.41e-04 60.710 57
CPL -1.876 N/A N/A 9998.970 N/A N/A 7.93e-04 N/A N/A 60.720 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 -1.252 -0.574 0.585 - - - 3.65e-03 -1.05e-03 1.05e-03 50.350 57
CPL -1.247 -0.579 0.589 9999.360 -9999.360 -9999.360 3.67e-03 -1.06e-03 1.49e-02 50.350 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 9.54e-08 1.40e-07 1.53e-07 3.15e-07 4.85e-07 7.04e-07 erg/cm2
90%_error_low -1.89e-08 -1.97e-08 -3.80e-08 -1.33e-07 -8.60e-08 -1.78e-07 erg/cm2
90%_error_hi 1.94e-08 1.96e-08 3.91e-08 1.88e-07 8.92e-08 2.23e-07 erg/cm2
Peak flux PL 1.19e-01 1.38e-01 1.16e-01 1.65e-01 4.32e-01 5.38e-01 ph/cm2/s
90%_error_low -6.17e-02 -4.83e-02 -4.23e-02 -9.99e-02 -1.27e-01 -1.61e-01 ph/cm2/s
90%_error_hi 7.42e-02 4.54e-02 4.02e-02 1.71e-01 1.28e-01 1.72e-01 ph/cm2/s
Fluence CPL 9.59e-08 1.25e-07 1.40e-07 3.81e-07 4.14e-07 7.04e-07 erg/cm2
90%_error_low -2.08e-08 -3.02e-08 -2.64e-08 -1.84e-07 -1.00e-07 -2.79e-07 erg/cm2
90%_error_hi 2.00e-08 2.91e-08 2.33e-08 1.22e-07 1.00e-07 1.01e-07 erg/cm2
Peak flux CPL 1.19e-01 1.38e-01 1.16e-01 1.64e-01 4.32e-01 5.62e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A -2.08e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A 1.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 282.0313 61.9277 0.0166 15.9611 -38.3848 1.0502762 11.512 TRIG_00454473 Foreground time interval of the image: -48.864 17.376 (delta_t = 66.240 [sec]) Background time interval of the image: -234.795 -48.864 (delta_t = 185.931 [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 -48.864 sec. to 17.376 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.86893 ( -0.287469 0.268998 ) Norm@50keV : 7.96516E-04 ( -0.00014629 0.000140808 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.71 using 59 PHA bins. # Reduced chi-squared = 1.065 for 57 degrees of freedom # Null hypothesis probability = 3.435935e-01 Photon flux (15-150 keV) in 66.24 sec: 0.112837 ( -0.0156726 0.015672 ) ph/cm2/s Energy fluence (15-150 keV) : 4.85121e-07 ( -8.59948e-08 8.91941e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -48.864 sec. to 17.376 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.25716 ( ) Epeak [keV] : 98.5114 ( ) Norm@50keV : 5.02775E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.58 using 59 PHA bins. # Reduced chi-squared = 1.082 for 56 degrees of freedom # Null hypothesis probability = 3.142092e-01 Photon flux (15-150 keV) in 66.24 sec: 0.105476 ( -0.0252752 0.021322 ) ph/cm2/s Energy fluence (15-150 keV) : 4.13561e-07 ( -9.99509e-08 1.00352e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.028 sec. to 2.028 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25195 ( -0.574446 0.584744 ) Norm@50keV : 3.65199E-03 ( -0.00105236 0.00104891 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.35 using 59 PHA bins. # Reduced chi-squared = 0.8832 for 57 degrees of freedom # Null hypothesis probability = 7.211345e-01 Photon flux (15-150 keV) in 1 sec: 0.432069 ( -0.127057 0.12757 ) ph/cm2/s Energy fluence (15-150 keV) : 3.65351e-08 ( -1.19258e-08 1.22323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.028 sec. to 2.028 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.24704 ( -0.578667 0.588774 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.66811E-03 ( -0.001059 0.0148689 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.35 using 59 PHA bins. # Reduced chi-squared = 0.8991 for 56 degrees of freedom # Null hypothesis probability = 6.877700e-01 Photon flux (15-150 keV) in 1 sec: 0.432008 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.67046e-08 ( -1.35664e-08 1.38732e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 55.728 sec. Hardness ratio (energy fluence ratio) = 1.09514046296
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.3539069e-07 S(50-150 keV) = 2.4972859e-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 = 2.241918560127483E-01, IMY = 1.775956978590825E-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: -234.795400 -48.864000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4688 35.4925 9.3 22.2 73.3 0.2514 1.2 9.0 Her X-1 299.5766 35.1908 0.7 39.0 4.1 4.2328 16.6 0.9 Cyg X-1 308.0822 40.9489 3.1 39.2 -9.9 0.8910 3.7 1.3 Cyg X-3 326.2625 38.5218 0.0 50.7 -21.8 -0.2783 -0.7 12.7 Cyg X-2 229.4101 21.3184 3.0 39.6 113.3 2.5035 3.8 ------ UNKNOWN 186.5151 49.1619 2.4 38.0 -173.6 1.1739 4.8 ------ UNKNOWN 307.9839 37.5681 2.5 41.6 -6.2 1.2557 4.7 ------ UNKNOWN 159.2817 46.5741 4.2 53.1 -158.8 1.2844 2.8 ------ UNKNOWN 344.3127 50.6594 3.1 50.6 -44.7 3.1240 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -48.864000 17.376000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4343 35.3444 69.7 22.3 73.5 0.0202 0.2 1.1 Her X-1 299.6110 35.0193 7.6 39.1 4.2 -0.2309 -1.5 11.0 Cyg X-1 308.1278 41.1507 0.0 39.1 -10.2 -0.3043 -2.2 11.9 Cyg X-3 326.3078 38.3148 5.5 50.8 -21.7 -0.4846 -2.1 6.4 Cyg X-2 260.5288 24.8397 2.3 33.4 64.9 1.0474 5.1 ------ UNKNOWN 297.3678 18.3983 2.4 51.8 19.8 1.9218 4.8 ------ UNKNOWN 282.0312 61.9277 1.0 16.0 -38.4 1.0504 11.5 ------ UNKNOWN 316.5259 38.4889 2.6 45.5 -14.3 0.7585 4.5 ------ UNKNOWN 146.8463 64.5937 2.1 45.2 -135.5 1.2421 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 417.904620 962.437300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4696 35.3290 18.8 31.7 104.0 0.4588 0.6 1.0 Her X-1 299.5756 35.1851 0.5 28.9 27.5 10.8137 24.2 1.2 Cyg X-1 308.0802 40.9418 1.4 26.2 9.3 3.1863 8.0 1.5 Cyg X-3 326.2086 38.3033 10.9 35.7 -11.3 0.5115 1.0 2.1 Cyg X-2 195.0475 39.8459 2.5 54.3 167.3 8.7778 4.7 ------ UNKNOWN 249.8494 55.3593 3.4 17.8 141.1 1.4152 3.4 ------ UNKNOWN 326.9327 40.7509 2.9 34.0 -14.6 1.8236 3.9 ------ UNKNOWN 141.4894 59.0790 3.5 55.2 -145.3 12.3317 3.4 ------ UNKNOWN 140.7748 59.2445 7.2 55.2 -144.8 5.6084 1.7 ------ UNKNOWN