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: Sun Jan 19 17:09:08 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger350853
======================================================================
Trigger: 00350853 Segment: 000
BAT Trigger Time: 262673624.576 [s; MET]
Trigger Stop: 262673625.6 [s; MET]
UTC: 2009-04-29T04:53:39.877600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 90.5593470267977 Dec: -52.3860905103926 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.64
Image Trigger?: NO
Rate S/N Ratio: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 5.64
Analysis Position: [ source = BAT ]
RA: 90.5593470267977 Dec: -52.3860905103926 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 90.5683045252455 Dec: -52.3930623624934 [deg; J2000]
{ 06h 02m 16.4s , -52d 23' 35.0" }
+/- 1.69923262039163 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672444583905834 [arcmin] (formal 1-sigma fit error)
SNR: 14.2621748394728
Angular difference between the analysis and refined position is 0.531571 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 184 +/- 48.5077313425396
Measured from: -8.57600000500679
to: 175.423999994993 [s; relative to TRIGTIME]
T50: 78 +/- 38.2099463490856
Measured from: 2.42399999499321
to: 80.4239999949932 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.57600000500679
to: 0.42399999499321 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.5760000050068
to: 203.423999994993 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.500451 0.725773 0.438136 0.245794
0.071867 0.074460 0.066249 0.059881 [error]
Peak 0.017834 0.028302 0.023782 0.007752
0.005080 0.005362 0.004775 0.004158 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 217.000 -13.576 203.424
T90 184.000 -8.576 175.424
T50 78.000 2.424 80.424
Peak 1.000 -0.576 0.424
====== 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 -1.519 -0.221 0.218 - - - 5.29e-04 -6.72e-05 6.61e-05 51.620 57
CPL -1.513 -1.147 0.655 9998.890 -9998.890 -9998.890 5.30e-04 -3.74e-04 6.36e-04 51.620 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 -1.160 -0.369 0.390 - - - 4.82e-03 -9.85e-04 9.85e-04 65.220 57
CPL -1.155 -0.372 0.392 9999.300 -9999.300 -9999.300 4.85e-03 -9.90e-04 1.22e-03 65.230 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 1.49e-07 2.71e-07 3.78e-07 1.10e-06 1.09e-06 1.90e-06 erg/cm2
90%_error_low -2.88e-08 -3.27e-08 -6.48e-08 -3.55e-07 -1.52e-07 -4.16e-07 erg/cm2
90%_error_hi 3.00e-08 3.25e-08 6.47e-08 4.59e-07 1.55e-07 5.04e-07 erg/cm2
Peak flux PL 1.43e-01 1.77e-01 1.58e-01 2.45e-01 5.63e-01 7.24e-01 ph/cm2/s
90%_error_low -5.48e-02 -4.38e-02 -3.85e-02 -1.07e-01 -1.18e-01 -1.57e-01 ph/cm2/s
90%_error_hi 6.11e-02 4.21e-02 3.76e-02 1.56e-01 1.18e-01 1.67e-01 ph/cm2/s
Fluence CPL 1.49e-07 2.66e-07 3.77e-07 1.29e-06 1.10e-06 1.92e-06 erg/cm2
90%_error_low N/A -3.63e-08 N/A -9.31e-07 -2.35e-07 -7.86e-07 erg/cm2
90%_error_hi N/A 5.10e-08 N/A 5.50e-08 1.96e-07 2.19e-07 erg/cm2
Peak flux CPL 1.47e-01 1.75e-01 1.57e-01 2.44e-01 5.66e-01 7.44e-01 ph/cm2/s
90%_error_low -5.90e-02 -4.49e-02 -3.92e-02 N/A -1.27e-01 -2.49e-01 ph/cm2/s
90%_error_hi 5.76e-02 4.87e-02 4.29e-02 N/A 1.22e-01 1.54e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 90.5683 -52.3931 0.0135 14.5184 -26.6512 0.8360454 14.262 TRIG_00350853 Foreground time interval of the image: -13.576 11.725 (delta_t = 25.301 [sec]) Background time interval of the image: -60.576 -13.576 (delta_t = 47.000 [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 -13.576 sec. to 203.424 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51854 ( -0.22083 0.217542 ) Norm@50keV : 5.28784E-04 ( -6.71779e-05 6.61476e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.62 using 59 PHA bins. # Reduced chi-squared = 0.9056 for 57 degrees of freedom # Null hypothesis probability = 6.764533e-01 Photon flux (15-150 keV) in 217 sec: 6.63492E-02 ( -0.0078521 0.007858 ) ph/cm2/s Energy fluence (15-150 keV) : 1.08545e-06 ( -1.52217e-07 1.55145e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.576 sec. to 203.424 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51268 ( -1.14467 0.6572 ) Epeak [keV] : 9998.89 ( -9999.33 -9999.33 ) Norm@50keV : 5.30475E-04 ( -0.000373547 0.000636203 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.62 using 59 PHA bins. # Reduced chi-squared = 0.9219 for 56 degrees of freedom # Null hypothesis probability = 6.410718e-01 Photon flux (15-150 keV) in 217 sec: 6.67502E-02 ( -0.0101279 0.0091949 ) ph/cm2/s Energy fluence (15-150 keV) : 1.09883e-06 ( -2.34796e-07 1.96203e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.576 sec. to 0.424 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16008 ( -0.368567 0.389992 ) Norm@50keV : 4.82460E-03 ( -0.000984853 0.000984839 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.22 using 59 PHA bins. # Reduced chi-squared = 1.144 for 57 degrees of freedom # Null hypothesis probability = 2.125832e-01 Photon flux (15-150 keV) in 1 sec: 0.563334 ( -0.117538 0.117906 ) ph/cm2/s Energy fluence (15-150 keV) : 4.95222e-08 ( -1.13805e-08 1.15987e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.576 sec. to 0.424 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.155 ( -0.371567 0.392481 ) Epeak [keV] : 9999.30 ( -9999.36 -9999.36 ) Norm@50keV : 4.84854E-03 ( -0.00098971 0.00121799 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.23 using 59 PHA bins. # Reduced chi-squared = 1.165 for 56 degrees of freedom # Null hypothesis probability = 1.866682e-01 Photon flux (15-150 keV) in 1 sec: 0.565830 ( -0.126597 0.121609 ) ph/cm2/s Energy fluence (15-150 keV) : 4.98196e-08 ( -1.26943e-08 8.1593e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 184.0 sec. Hardness ratio (energy fluence ratio) = 1.39620820677
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.199596e-07 S(50-150 keV) = 6.654991e-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 = 2.314468653689279E-01, IMY = 1.161585947926813E-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: -60.576000 -13.576000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5029 -40.5086 3.9 37.9 32.3 0.3647 2.9 3.0 Vela X-1 170.3083 -60.7810 5.6 35.1 82.5 -0.3812 -2.1 9.5 Cen X-3 186.5397 -62.6940 3.0 38.7 94.2 1.0347 3.8 5.6 GX 301-2
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -13.576000 11.724590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6705 -40.4188 0.0 38.1 32.4 0.0345 0.3 10.4 Vela X-1 170.6040 -60.6442 8.3 35.3 82.5 -0.2326 -1.4 8.6 Cen X-3 186.4336 -62.7123 3.4 38.7 94.2 -0.8468 -3.4 7.0 GX 301-2 158.3788 -47.2253 1.9 41.2 59.8 1.5023 6.1 ------ UNKNOWN 133.9169 -23.6856 2.5 52.5 20.3 1.5081 4.7 ------ UNKNOWN 90.5683 -52.3931 0.8 14.5 -26.7 0.8360 14.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 47.124590 257.324600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5295 -40.5433 2.8 32.5 49.4 1.1570 4.1 0.7 Vela X-1 8.6907 -65.7903 2.6 40.7 -179.0 1.0602 4.4 ------ UNKNOWN 7.7601 -43.8407 2.1 52.9 -153.6 2.8539 5.5 ------ UNKNOWN 79.2698 -6.1963 4.4 47.1 -52.9 2.0758 2.7 ------ UNKNOWN