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 23:49:40 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger449074
======================================================================
Trigger: 00449074 Segment: 000
BAT Trigger Time: 321645344 [s; MET]
Trigger Stop: 321645408 [s; MET]
UTC: 2011-03-12T17:55:37.252060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 157.478927330622 Dec: -5.25539715048247 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.46
Analysis Position: [ source = BAT ]
RA: 157.478927330622 Dec: -5.25539715048247 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 157.501452086839 Dec: -5.24851311355309 [deg; J2000]
{ 10h 30m 00.3s , -05d 14' 54.6" }
+/- 2.17469144269274 [arcmin] (estimated 90% radius based on SNR)
+/- 0.942252018649503 [arcmin] (formal 1-sigma fit error)
SNR: 10.0258624842532
Angular difference between the analysis and refined position is 1.407769 arcmin
Partial Coding Fraction: 0.265625 [ including projection effects ]
Duration
T90: 35.1360000371933 +/- 7.78107652907125
Measured from: 26.7760000228882
to: 61.9120000600815 [s; relative to TRIGTIME]
T50: 14.6720000505447 +/- 4.83978840572785
Measured from: 35.9599999785423
to: 50.6320000290871 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 44.2039999961853
to: 45.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: 24.727999985218
to: 64.7760000228882 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.736212 0.633860 0.215651 0.070906
0.068068 0.070712 0.065264 0.067413 [error]
Peak 0.058484 0.036804 0.040830 0.016228
0.011313 0.011064 0.009979 0.010671 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 40.048 24.728 64.776
T90 35.136 26.776 61.912
T50 14.672 35.960 50.632
Peak 1.000 44.204 45.204
====== 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 -2.333 -0.271 0.248 - - - 2.11e-03 -4.11e-04 4.07e-04 47.950 57
CPL -1.526 -0.767 1.457 20.593 N/A N/A 6.94e-03 N/A N/A 46.450 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 -1.849 -0.527 0.468 - - - 8.34e-03 -2.53e-03 2.33e-03 59.860 57
CPL -1.855 -1.047 1.082 9999.320 N/A N/A 8.33e-03 N/A N/A 59.860 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 2.37e-07 2.64e-07 2.09e-07 2.75e-07 8.12e-07 9.85e-07 erg/cm2
90%_error_low -3.59e-08 -3.58e-08 -5.36e-08 -1.14e-07 -1.25e-07 -1.95e-07 erg/cm2
90%_error_hi 3.63e-08 3.51e-08 5.77e-08 1.62e-07 1.30e-07 2.32e-07 erg/cm2
Peak flux PL 4.81e-01 3.94e-01 2.19e-01 1.79e-01 1.17e+00 1.27e+00 ph/cm2/s
90%_error_low -1.73e-01 -9.21e-02 -8.58e-02 -1.09e-01 -2.75e-01 -3.01e-01 ph/cm2/s
90%_error_hi 1.86e-01 9.20e-02 8.55e-02 1.79e-01 2.75e-01 3.03e-01 ph/cm2/s
Fluence CPL 2.31e-07 2.86e-07 1.77e-07 5.70e-08 7.36e-07 7.52e-07 erg/cm2
90%_error_low -3.85e-08 N/A -7.78e-08 N/A N/A -1.47e-07 erg/cm2
90%_error_hi 3.81e-08 N/A 7.41e-08 N/A N/A 3.35e-07 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -1.73e-01 -9.21e-02 -8.58e-02 -1.09e-01 -2.75e-01 -3.01e-01 ph/cm2/s
90%_error_hi 1.86e-01 9.20e-02 8.55e-02 1.79e-01 2.75e-01 3.03e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 157.5015 -5.2485 0.0191 33.0788 81.3812 1.6105041 10.026 TRIG_00449074 Foreground time interval of the image: 24.728 64.776 (delta_t = 40.048 [sec]) Background time interval of the image: -133.499 24.728 (delta_t = 158.227 [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 24.728 sec. to 64.776 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.33265 ( -0.271473 0.248326 ) Norm@50keV : 2.10710E-03 ( -0.00041114 0.000406723 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.95 using 59 PHA bins. # Reduced chi-squared = 0.8413 for 57 degrees of freedom # Null hypothesis probability = 7.977318e-01 Photon flux (15-150 keV) in 40.05 sec: 0.375086 ( -0.045199 0.045207 ) ph/cm2/s Energy fluence (15-150 keV) : 8.11657e-07 ( -1.24949e-07 1.30498e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.728 sec. to 64.776 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5258 ( -0.767225 1.45718 ) Epeak [keV] : 20.5928 ( ) Norm@50keV : 6.93979E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.45 using 59 PHA bins. # Reduced chi-squared = 0.8295 for 56 degrees of freedom # Null hypothesis probability = 8.146238e-01 Photon flux (15-150 keV) in 40.05 sec: 0.375599 ( -0.04559 0.044936 ) ph/cm2/s Energy fluence (15-150 keV) : 7.36467e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 44.204 sec. to 45.204 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84912 ( -0.52711 0.468376 ) Norm@50keV : 8.34142E-03 ( -0.00253136 0.00232784 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.86 using 59 PHA bins. # Reduced chi-squared = 1.050 for 57 degrees of freedom # Null hypothesis probability = 3.724263e-01 Photon flux (15-150 keV) in 1 sec: 1.17212 ( -0.275033 0.27534 ) ph/cm2/s Energy fluence (15-150 keV) : 7.67096e-08 ( -2.1887e-08 2.27645e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 44.204 sec. to 45.204 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.68935 ( -0.212669 1.91627 ) Epeak [keV] : 227.047 ( ) Norm@50keV : 3.26588E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.43 using 59 PHA bins. # Reduced chi-squared = 1.061 for 56 degrees of freedom # Null hypothesis probability = 3.518850e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 5.77364e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 35.136 sec. Hardness ratio (energy fluence ratio) = 0.794127245419
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.005823e-07 S(50-150 keV) = 3.110949e-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 = 9.761395287750096E-02, IMY = -6.440098545552502E-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: -133.499410 24.728000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5276 -40.5328 1.3 17.0 -23.1 1.4418 8.7 1.3 Vela X-1 170.1533 -60.6159 5.2 23.7 -114.4 0.4225 2.2 4.8 Cen X-3 186.4957 -62.7335 5.1 30.1 -125.2 0.5056 2.3 4.9 GX 301-2 189.9443 -7.6090 2.6 42.5 133.4 2.3863 4.4 ------ UNKNOWN 132.1855 -18.8571 2.4 29.3 25.7 0.9258 4.9 ------ UNKNOWN 209.2856 -31.3967 2.4 42.6 178.2 1.3703 4.8 ------ UNKNOWN 165.2340 -41.9674 2.4 7.0 -155.0 0.7211 4.8 ------ UNKNOWN 116.8714 -28.4762 2.7 34.9 -4.8 0.8645 4.2 ------ UNKNOWN 105.9640 -26.0590 2.6 44.6 -8.6 1.1784 4.5 ------ UNKNOWN 138.6884 -61.7681 2.8 26.1 -78.6 0.8748 4.2 ------ UNKNOWN 234.4169 -40.6506 2.9 57.5 -160.1 3.3889 3.9 ------ UNKNOWN 87.9354 -26.6532 2.6 58.4 -19.5 4.0303 4.5 ------ UNKNOWN 85.0375 -30.0422 2.9 58.9 -24.4 4.9576 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 24.728000 64.776000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4650 -40.4428 3.2 17.0 -22.8 -0.2734 -3.6 7.3 Vela X-1 170.1703 -60.6978 8.7 23.8 -114.4 -0.1149 -1.3 6.2 Cen X-3 186.3478 -62.7582 10.7 30.0 -125.1 -0.1101 -1.1 8.5 GX 301-2 157.5015 -5.2485 1.1 33.1 81.4 1.6101 10.0 ------ UNKNOWN 174.8128 -20.7926 2.0 23.1 126.7 0.5455 5.8 ------ UNKNOWN 158.8245 -63.2338 2.1 24.9 -100.3 0.5138 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 146.700650 963.160000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5021 -40.5318 1.1 40.4 -124.5 9.3784 10.1 1.8 Vela X-1 170.2574 -60.6358 17.7 56.2 -158.0 -1.4477 -0.6 1.9 Cen X-3 155.5829 -35.6594 2.5 30.5 -147.5 2.3892 4.7 ------ UNKNOWN 148.6460 -60.0888 4.0 55.3 -145.2 9.2846 2.9 ------ UNKNOWN