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 12:28:05 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger378554
======================================================================
Trigger: 00378554 Segment: 000
BAT Trigger Time: 281954765.888 [s; MET]
Trigger Stop: 281954766.912 [s; MET]
UTC: 2009-12-08T08:46:00.559040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.274140327777107 Dec: 65.6736677782883 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.41
Image Trigger?: NO
Rate S/N Ratio: 55.4707129934347 [ if not an image trigger ]
Image S/N Ratio: 14.41
Analysis Position: [ source = BAT ]
RA: 0.274140327777107 Dec: 65.6736677782883 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 0.274380074759634 Dec: 65.6700083731657 [deg; J2000]
{ 00h 01m 05.9s , +65d 40' 12.0" }
+/- 1.23989208867154 [arcmin] (estimated 90% radius based on SNR)
+/- 0.555667893092608 [arcmin] (formal 1-sigma fit error)
SNR: 22.372412818193
Angular difference between the analysis and refined position is 0.219644 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 80 +/- 16
Measured from: -0.888000011444092
to: 79.1119999885559 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -0.888000011444092
to: 31.1119999885559 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.61199998855591
to: 7.61199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.888000011444092
to: 95.1119999885559 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.516962 0.718366 0.872866 0.384345
0.052889 0.055521 0.050568 0.044644 [error]
Peak 0.011883 0.028186 0.024974 0.008258
0.005615 0.006118 0.005631 0.004745 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 96.000 -0.888 95.112
T90 80.000 -0.888 79.112
T50 32.000 -0.888 31.112
Peak 1.000 6.612 7.612
====== 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 -0.943 -0.129 0.134 - - - 1.70e-03 -1.19e-04 1.18e-04 59.300 57
CPL -0.949 -0.118 0.229 9999.360 -9999.360 -9999.360 1.72e-03 -1.23e-04 1.08e-04 59.430 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 -1.072 -0.388 0.414 - - - 5.01e-03 -1.18e-03 1.18e-03 52.470 57
CPL -0.286 -1.114 2.314 115.833 -115.833 -115.833 1.19e-02 -1.19e-02 1.33e-01 51.750 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 1.24e-07 3.21e-07 6.69e-07 3.55e-06 1.80e-06 4.67e-06 erg/cm2
90%_error_low -1.91e-08 -2.96e-08 -4.76e-08 -5.95e-07 -1.26e-07 -6.12e-07 erg/cm2
90%_error_hi 2.03e-08 2.91e-08 4.73e-08 6.85e-07 1.27e-07 6.92e-07 erg/cm2
Peak flux PL 1.37e-01 1.78e-01 1.69e-01 2.85e-01 5.80e-01 7.70e-01 ph/cm2/s
90%_error_low -5.79e-02 -5.14e-02 -4.42e-02 -1.29e-01 -1.40e-01 -1.90e-01 ph/cm2/s
90%_error_hi 6.69e-02 5.00e-02 4.35e-02 1.86e-01 1.40e-01 2.02e-01 ph/cm2/s
Fluence CPL 1.24e-07 3.22e-07 6.53e-07 3.60e-06 1.81e-06 4.32e-06 erg/cm2
90%_error_low -1.92e-08 -3.13e-08 -3.12e-08 -1.08e-06 -1.34e-07 -4.34e-07 erg/cm2
90%_error_hi 2.03e-08 2.99e-08 6.38e-08 1.95e-07 1.19e-07 1.01e-06 erg/cm2
Peak flux CPL 1.16e-01 1.90e-01 1.83e-01 1.31e-01 5.64e-01 6.20e-01 ph/cm2/s
90%_error_low -6.69e-02 -5.79e-02 -5.13e-02 -1.31e-01 -1.44e-01 -1.87e-01 ph/cm2/s
90%_error_hi 7.75e-02 6.22e-02 5.43e-02 1.89e-01 1.44e-01 2.63e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.2744 65.6700 0.0086 25.7513 -177.7297 2.6061020 22.372 TRIG_00378554
Foreground time interval of the image:
-0.888 95.112 (delta_t = 96.000 [sec])
Background time interval of the image:
-703.487 -648.857 (delta_t = 54.630 [sec])
-239.888 -0.888 (delta_t = 239.000 [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 -0.888 sec. to 95.112 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.942703 ( -0.129423 0.133573 ) Norm@50keV : 1.70095E-03 ( -0.000119138 0.000117909 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.30 using 59 PHA bins. # Reduced chi-squared = 1.040 for 57 degrees of freedom # Null hypothesis probability = 3.918116e-01 Photon flux (15-150 keV) in 96 sec: 0.195379 ( -0.013811 0.0139 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80319e-06 ( -1.26348e-07 1.26741e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.888 sec. to 95.112 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.936776 ( -0.119146 0.22858 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.71164E-03 ( -0.000119466 0.000112087 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.41 using 59 PHA bins. # Reduced chi-squared = 1.061 for 56 degrees of freedom # Null hypothesis probability = 3.524994e-01 Photon flux (15-150 keV) in 96 sec: 0.195327 ( -0.013847 0.013869 ) ph/cm2/s Energy fluence (15-150 keV) : 1.8106e-06 ( -1.34493e-07 1.1853e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.612 sec. to 7.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07206 ( -0.387892 0.413913 ) Norm@50keV : 5.01076E-03 ( -0.00118325 0.00118023 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.47 using 59 PHA bins. # Reduced chi-squared = 0.9206 for 57 degrees of freedom # Null hypothesis probability = 6.453133e-01 Photon flux (15-150 keV) in 1 sec: 0.579744 ( -0.139535 0.140229 ) ph/cm2/s Energy fluence (15-150 keV) : 5.28701e-08 ( -1.34325e-08 1.36251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.612 sec. to 7.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.286223 ( -1.11414 2.31392 ) Epeak [keV] : 115.833 ( -115.834 -115.834 ) Norm@50keV : 1.19483E-02 ( -0.011948 0.133346 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.75 using 59 PHA bins. # Reduced chi-squared = 0.9241 for 56 degrees of freedom # Null hypothesis probability = 6.363265e-01 Photon flux (15-150 keV) in 1 sec: 0.563586 ( -0.143891 0.143999 ) ph/cm2/s Energy fluence (15-150 keV) : 5.00991e-08 ( -1.50997e-08 1.48346e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 80.0 sec. Hardness ratio (energy fluence ratio) = 2.08103821224
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.453989e-07 S(50-150 keV) = 1.3577814e-06
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 = -4.819923381330219E-01, IMY = 1.910860112550748E-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: -703.487400 -648.857200 -239.888000 -0.888000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1059 38.2206 7.9 55.0 -150.1 1.5729 1.5 6.8 Cyg X-2 342.3551 33.3035 3.3 59.1 -166.1 5.1305 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.888000 95.112000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0612 38.2905 15.5 55.0 -150.0 -0.3688 -0.7 5.5 Cyg X-2 0.2744 65.6700 0.5 25.8 -177.7 2.6057 22.4 ------ UNKNOWN 177.6187 30.4527 2.3 58.3 -6.0 3.4612 5.1 ------ UNKNOWN 205.9857 35.8590 2.3 55.0 -34.9 2.9242 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 325.012600 782.231400 840.112000 962.224800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6046 35.5200 0.0 41.8 -152.4 -0.3782 -0.7 12.8 Her X-1 156.5861 8.2700 2.9 49.9 24.7 4.8999 3.9 ------ UNKNOWN 265.5263 54.5030 2.4 47.2 179.3 3.0122 4.9 ------ UNKNOWN 172.4380 -15.3376 3.1 57.4 -9.5 5.8333 3.7 ------ UNKNOWN 268.4392 40.4504 2.2 51.2 -162.7 4.2103 5.3 ------ UNKNOWN 276.4399 35.3101 5.3 58.8 -159.2 5.9542 2.2 ------ UNKNOWN