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 12:52:28 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger375409
======================================================================
Trigger: 00375409 Segment: 000
BAT Trigger Time: 279496148.404 [s; MET]
Trigger Stop: 279496148.468 [s; MET]
UTC: 2009-11-09T21:49:03.157720 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 112.716715657691 Dec: -54.0804743571872 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 27.7848879788996 [ if not an image trigger ]
Image S/N Ratio: 7.05
Analysis Position: [ source = BAT ]
RA: 112.716715657691 Dec: -54.0804743571872 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 112.74942082414 Dec: -54.091435916856 [deg; J2000]
{ 07h 30m 59.9s , -54d 05' 29.2" }
+/- 1.19029952048663 [arcmin] (estimated 90% radius based on SNR)
+/- 0.510577794860176 [arcmin] (formal 1-sigma fit error)
SNR: 23.7158126307739
Angular difference between the analysis and refined position is 1.325685 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 0.271999955177307 +/- 0.0468187824917992
Measured from: 0.0120000243186951
to: 0.283999979496002 [s; relative to TRIGTIME]
T50: 0.0919999480247498 +/- 0.0282842442734789
Measured from: 0.100000023841858
to: 0.191999971866608 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.333999991416931
to: 0.666000008583069 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.332000017166138 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.032500 0.076578 0.096758 0.038768
0.004394 0.005715 0.006226 0.005627 [error]
Peak 0.039689 0.071589 0.098012 0.035561
0.006512 0.007582 0.007662 0.006861 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.336 -0.004 0.332
T90 0.272 0.012 0.284
T50 0.092 0.100 0.192
Peak 1.000 -0.334 0.666
====== 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 -0.710 -0.128 0.132 - - - 4.77e-02 -3.68e-03 3.65e-03 54.200 57
CPL -0.400 -0.437 0.589 310.465 -310.465 -310.465 6.47e-02 -1.95e-02 4.82e-02 53.200 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 -0.768 -0.167 0.175 - - - 1.65e-02 -1.63e-03 1.60e-03 64.590 57
CPL -0.761 -0.168 0.177 9999.310 -9999.310 -9999.310 1.66e-02 -1.53e-03 1.63e-02 64.590 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 9.82e-09 2.94e-08 7.19e-08 4.91e-07 1.95e-07 6.02e-07 erg/cm2
90%_error_low -1.54e-09 -2.85e-09 -5.56e-09 -8.33e-08 -1.55e-08 -8.62e-08 erg/cm2
90%_error_hi 1.63e-09 2.82e-09 5.54e-09 9.55e-08 1.55e-08 9.72e-08 erg/cm2
Peak flux PL 3.38e-01 5.28e-01 6.20e-01 1.41e+00 1.90e+00 2.89e+00 ph/cm2/s
90%_error_low -7.04e-02 -6.96e-02 -5.82e-02 -2.78e-01 -1.80e-01 -3.04e-01 ph/cm2/s
90%_error_hi 7.65e-02 6.86e-02 5.79e-02 3.24e-01 1.81e-01 3.21e-01 ph/cm2/s
Fluence CPL 9.03e-09 3.00e-08 7.47e-08 3.30e-07 1.93e-07 4.44e-07 erg/cm2
90%_error_low -1.98e-09 -3.04e-09 -7.17e-09 -1.54e-07 -1.63e-08 -1.52e-07 erg/cm2
90%_error_hi 1.98e-09 3.10e-09 7.29e-09 2.02e-07 1.61e-08 2.03e-07 erg/cm2
Peak flux CPL 3.38e-01 5.28e-01 6.20e-01 1.40e+00 1.90e+00 2.89e+00 ph/cm2/s
90%_error_low -4.87e-02 -6.24e-02 -5.82e-02 -6.75e-01 -1.86e-01 -7.08e-01 ph/cm2/s
90%_error_hi 7.63e-02 6.90e-02 6.07e-02 3.19e-01 1.80e-01 2.98e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 112.7494 -54.0914 0.0081 31.9575 -174.8748 0.2720716 23.716 TRIG_00375409 Foreground time interval of the image: -0.004 0.332 (delta_t = 0.336 [sec]) Background time interval of the image: -239.404 -0.004 (delta_t = 239.400 [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 -0.004 sec. to 0.332 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.710257 ( -0.127783 0.131777 ) Norm@50keV : 4.76927E-02 ( -0.00367889 0.00364937 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.20 using 59 PHA bins. # Reduced chi-squared = 0.9509 for 57 degrees of freedom # Null hypothesis probability = 5.806898e-01 Photon flux (15-150 keV) in 0.336 sec: 5.50843 ( -0.40852 0.40888 ) ph/cm2/s Energy fluence (15-150 keV) : 1.94724e-07 ( -1.54613e-08 1.55278e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.332 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.399877 ( -0.436714 0.589152 ) Epeak [keV] : 310.465 ( -310.473 -310.473 ) Norm@50keV : 6.47158E-02 ( -0.0194969 0.0482301 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.20 using 59 PHA bins. # Reduced chi-squared = 0.9500 for 56 degrees of freedom # Null hypothesis probability = 5.816291e-01 Photon flux (15-150 keV) in 0.336 sec: 5.46140 ( -0.4174 0.41654 ) ph/cm2/s Energy fluence (15-150 keV) : 1.92601e-07 ( -1.62984e-08 1.60924e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.334 sec. to 0.666 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.768475 ( -0.16731 0.174528 ) Norm@50keV : 1.64925E-02 ( -0.00162752 0.00160429 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.59 using 59 PHA bins. # Reduced chi-squared = 1.133 for 57 degrees of freedom # Null hypothesis probability = 2.286291e-01 Photon flux (15-150 keV) in 1 sec: 1.89803 ( -0.18011 0.18077 ) ph/cm2/s Energy fluence (15-150 keV) : 1.95348e-07 ( -1.89962e-08 1.90941e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.334 sec. to 0.666 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.761229 ( -0.168464 0.176466 ) Epeak [keV] : 9999.31 ( -9999.32 -9999.32 ) Norm@50keV : 1.66112E-02 ( -0.00153656 0.0162812 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.59 using 59 PHA bins. # Reduced chi-squared = 1.153 for 56 degrees of freedom # Null hypothesis probability = 2.016350e-01 Photon flux (15-150 keV) in 1 sec: 1.89767 ( -0.1858 0.17986 ) ph/cm2/s Energy fluence (15-150 keV) : 6.47814e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.272 sec. Hardness ratio (energy fluence ratio) = 2.44489394698
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.9233179e-08 S(50-150 keV) = 1.5549021e-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 = -6.213440742491267E-01, IMY = 5.572910654887778E-02
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: -239.404000 -0.004000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5532 -40.5544 1.4 51.8 -168.0 4.0370 8.0 1.1 Vela X-1 170.5960 -60.5919 8.4 45.7 -129.5 0.8915 1.4 8.5 Cen X-3 116.0482 -47.9734 3.0 38.0 -178.8 0.9571 3.9 ------ UNKNOWN 139.7758 -43.2276 2.4 51.1 -162.8 2.2457 4.9 ------ UNKNOWN 320.7932 -40.5525 2.5 52.9 -21.3 2.2270 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.004000 0.332000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6189 -40.5281 53.3 51.9 -168.0 0.0052 0.2 4.4 Vela X-1 170.2537 -60.7571 5.2 45.5 -129.6 -0.0682 -2.2 8.3 Cen X-3 112.7494 -54.0914 0.5 32.0 -174.9 0.2721 23.7 ------ UNKNOWN 187.1926 -69.7116 2.5 40.6 -114.5 0.1242 4.6 ------ UNKNOWN 292.4982 -60.7538 2.2 44.6 -55.2 0.1841 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.096640 962.663700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5125 -40.5611 0.4 20.4 -150.0 14.6829 28.2 0.8 Vela X-1 170.3465 -60.5676 2.5 30.7 -82.1 3.4539 4.6 3.4 Cen X-3 186.6416 -62.7633 3.0 37.4 -74.1 5.9443 3.8 0.6 GX 301-2 42.9070 -41.5904 3.8 46.4 47.9 6.9562 3.1 ------ UNKNOWN 22.9112 -61.0408 3.1 44.8 15.7 3.3699 3.8 ------ UNKNOWN 353.5617 -58.9912 3.4 56.8 4.8 10.2064 3.4 ------ UNKNOWN 355.9480 -60.1459 3.7 55.2 5.1 7.3370 3.1 ------ UNKNOWN 74.9433 -74.9525 3.0 25.5 -6.1 1.9494 3.9 ------ UNKNOWN 140.4742 -1.7463 2.8 57.1 -174.0 10.2911 4.1 ------ UNKNOWN 331.1273 -64.8917 5.3 57.4 -9.5 5.0496 2.2 ------ UNKNOWN 151.7463 -22.7179 2.7 42.9 -149.1 3.7722 4.3 ------ UNKNOWN