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 13:05:58 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger374598
======================================================================
Trigger: 00374598 Segment: 000
BAT Trigger Time: 278865283.584 [s; MET]
Trigger Stop: 278865284.608 [s; MET]
UTC: 2009-11-02T14:34:38.358760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 72.6742345146145 Dec: -72.5096722528519 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.01
Image Trigger?: NO
Rate S/N Ratio: 29.8496231131986 [ if not an image trigger ]
Image S/N Ratio: 13.01
Analysis Position: [ source = BAT ]
RA: 72.6742345146145 Dec: -72.5096722528519 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 72.6217139100931 Dec: -72.5272957296157 [deg; J2000]
{ 04h 50m 29.2s , -72d 31' 38.3" }
+/- 1.188577421284 [arcmin] (estimated 90% radius based on SNR)
+/- 0.444833580463779 [arcmin] (formal 1-sigma fit error)
SNR: 23.7649153381865
Angular difference between the analysis and refined position is 1.419229 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 6.6479999423027 +/- 0.466699022673212
Measured from: -0.412000000476837
to: 6.23599994182587 [s; relative to TRIGTIME]
T50: 3.37999993562698 +/- 0.856861668927801
Measured from: 0.544000029563904
to: 3.92399996519089 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.255999982357025
to: 0.744000017642975 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.779999971389771
to: 6.63200002908707 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.146619 0.270290 0.238510 0.104995
0.015270 0.017028 0.016113 0.014644 [error]
Peak 0.040105 0.065762 0.062156 0.023138
0.005827 0.006666 0.006542 0.005973 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.412 -0.780 6.632
T90 6.648 -0.412 6.236
T50 3.380 0.544 3.924
Peak 1.000 -0.256 0.744
====== 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 -1.079 -0.120 0.122 - - - 6.72e-03 -4.55e-04 4.55e-04 40.550 57
CPL -0.926 -0.213 0.507 375.349 -375.349 -375.349 7.96e-03 -1.62e-03 5.75e-03 40.240 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 -1.058 -0.183 0.187 - - - 1.24e-02 -1.32e-03 1.32e-03 70.540 57
CPL -0.721 -0.429 0.803 197.373 -197.373 -197.373 1.81e-02 -7.22e-03 2.57e-02 69.850 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 4.30e-08 1.02e-07 1.94e-07 8.90e-07 5.24e-07 1.23e-06 erg/cm2
90%_error_low -5.62e-09 -8.10e-09 -1.55e-08 -1.52e-07 -3.99e-08 -1.63e-07 erg/cm2
90%_error_hi 5.85e-09 8.03e-09 1.54e-08 1.74e-07 4.02e-08 1.82e-07 erg/cm2
Peak flux PL 3.33e-01 4.37e-01 4.20e-01 7.17e-01 1.43e+00 1.91e+00 ph/cm2/s
90%_error_low -6.58e-02 -5.45e-02 -5.26e-02 -1.74e-01 -1.53e-01 -2.29e-01 ph/cm2/s
90%_error_hi 6.96e-02 5.37e-02 5.21e-02 2.09e-01 1.53e-01 2.40e-01 ph/cm2/s
Fluence CPL 4.17e-08 1.04e-07 1.96e-07 7.02e-07 5.18e-07 1.04e-06 erg/cm2
90%_error_low -6.41e-09 -8.67e-09 -1.72e-08 -3.47e-07 -4.47e-08 -3.46e-07 erg/cm2
90%_error_hi 5.91e-09 9.43e-09 1.76e-08 2.47e-07 4.37e-08 3.76e-07 erg/cm2
Peak flux CPL 3.13e-01 4.51e-01 4.33e-01 4.77e-01 1.41e+00 1.67e+00 ph/cm2/s
90%_error_low -7.77e-02 -6.14e-02 -5.88e-02 -2.61e-01 -1.59e-01 -3.10e-01 ph/cm2/s
90%_error_hi 8.06e-02 6.38e-02 6.07e-02 3.00e-01 1.58e-01 3.60e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 72.6217 -72.5273 0.0080 17.3622 -81.3692 0.7818382 23.765 TRIG_00374598 Foreground time interval of the image: -0.780 6.632 (delta_t = 7.412 [sec]) Background time interval of the image: -239.584 -0.780 (delta_t = 238.804 [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 -0.780 sec. to 6.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07922 ( -0.119947 0.121793 ) Norm@50keV : 6.72200E-03 ( -0.000454734 0.000454571 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.55 using 59 PHA bins. # Reduced chi-squared = 0.7114 for 57 degrees of freedom # Null hypothesis probability = 9.511406e-01 Photon flux (15-150 keV) in 7.412 sec: 0.778213 ( -0.053659 0.053709 ) ph/cm2/s Energy fluence (15-150 keV) : 5.24476e-07 ( -3.99408e-08 4.02469e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.780 sec. to 6.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.926333 ( -0.212869 0.50696 ) Epeak [keV] : 375.349 ( -375.408 -375.408 ) Norm@50keV : 7.95773E-03 ( -0.00161933 0.00574543 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.24 using 59 PHA bins. # Reduced chi-squared = 0.7185 for 56 degrees of freedom # Null hypothesis probability = 9.444286e-01 Photon flux (15-150 keV) in 7.412 sec: 0.773106 ( -0.055914 0.055672 ) ph/cm2/s Energy fluence (15-150 keV) : 5.18377e-07 ( -4.46855e-08 4.37386e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.256 sec. to 0.744 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05757 ( -0.183376 0.187243 ) Norm@50keV : 1.23515E-02 ( -0.00131697 0.00131692 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.54 using 59 PHA bins. # Reduced chi-squared = 1.237 for 57 degrees of freedom # Null hypothesis probability = 1.073420e-01 Photon flux (15-150 keV) in 1 sec: 1.42738 ( -0.15325 0.15333 ) ph/cm2/s Energy fluence (15-150 keV) : 1.30954e-07 ( -1.61096e-08 1.63112e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.256 sec. to 0.744 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.721453 ( -0.428862 0.802624 ) Epeak [keV] : 197.373 ( -197.381 -197.381 ) Norm@50keV : 1.80899E-02 ( -0.007216 0.0256802 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.85 using 59 PHA bins. # Reduced chi-squared = 1.247 for 56 degrees of freedom # Null hypothesis probability = 1.010006e-01 Photon flux (15-150 keV) in 1 sec: 1.40837 ( -0.15881 0.15818 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2721e-07 ( -1.8312e-08 1.79811e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 6.648 sec. Hardness ratio (energy fluence ratio) = 1.89317118254
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.4520962e-07 S(50-150 keV) = 3.792707e-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 = 4.691906941692836E-02, IMY = 3.091151598307949E-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: -239.584000 -0.780000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6842 -40.5432 5.0 49.8 -143.1 1.3426 2.3 7.1 Vela X-1 336.4722 -44.3801 2.3 51.4 -3.5 2.2221 5.1 ------ UNKNOWN 320.8355 -54.9312 2.3 51.2 -22.2 2.3076 5.0 ------ UNKNOWN 270.4519 -78.2937 3.8 44.5 -60.4 2.8168 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.780000 6.632000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4026 -40.6125 1293.1 49.6 -143.3 -0.0009 -0.0 6.7 Vela X-1 72.6217 -72.5273 0.5 17.4 -81.4 0.7817 23.7 ------ UNKNOWN 95.2771 -65.5434 2.5 19.3 -114.9 0.1401 4.5 ------ UNKNOWN 323.7758 -78.3246 2.4 37.0 -49.3 0.2449 4.8 ------ UNKNOWN 302.7155 -57.6242 2.4 55.8 -33.8 0.7918 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 276.716600 832.916600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 144.6345 14.6371 2.3 44.1 7.7 2.7346 5.1 ------ UNKNOWN