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: Wed Jan 22 16:53:07 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger208050
======================================================================
Trigger: 00208050 Segment: 000
BAT Trigger Time: 168164100.032 [s; MET]
Trigger Stop: 168164101.056 [s; MET]
UTC: 2006-05-01T08:14:58.865920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.367202913993 Dec: 43.9831881862281 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.15
Image Trigger?: NO
Rate S/N Ratio: 23.3023603954621 [ if not an image trigger ]
Image S/N Ratio: 11.15
Analysis Position: [ source = BAT ]
RA: 328.367202913993 Dec: 43.9831881862281 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 328.368779028254 Dec: 43.9999259906866 [deg; J2000]
{ 21h 53m 28.5s , +43d 59' 59.7" }
+/- 1.4668303481302 [arcmin] (estimated 90% radius based on SNR)
+/- 0.504397776771621 [arcmin] (formal 1-sigma fit error)
SNR: 17.5967647278263
Angular difference between the analysis and refined position is 1.006570 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 25.6280000209808 +/- 10.379552205759
Measured from: -3.27200001478195
to: 22.3560000061989 [s; relative to TRIGTIME]
T50: 7.30000001192093 +/- 1.40534408393302
Measured from: 0.219999998807907
to: 7.52000001072884 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.375999987125397
to: 1.3759999871254 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.1159999966621
to: 30.1519999802113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.487431 0.730767 0.622639 0.209619
0.054911 0.058040 0.052049 0.046318 [error]
Peak 0.042891 0.076873 0.095633 0.030810
0.009115 0.010391 0.010059 0.008087 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 40.268 -10.116 30.152
T90 25.628 -3.272 22.356
T50 7.300 0.220 7.520
Peak 1.000 0.376 1.376
====== 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 -1.499 -0.150 0.149 - - - 3.65e-03 -3.05e-04 3.04e-04 51.260 57
CPL -1.421 -0.217 0.588 375.400 -375.400 -375.400 3.97e-03 -3.97e-03 -2.04e-03 51.220 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -0.961 -0.210 0.220 - - - 1.75e-02 -2.28e-03 2.25e-03 76.010 57
CPL -0.620 -0.442 0.948 260.563 -260.563 -260.563 2.39e-02 -8.25e-03 2.93e-02 75.480 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 1.88e-07 3.45e-07 4.88e-07 1.45e-06 1.40e-06 2.47e-06 erg/cm2
90%_error_low -2.82e-08 -3.17e-08 -5.14e-08 -3.10e-07 -1.24e-07 -3.49e-07 erg/cm2
90%_error_hi 2.95e-08 3.14e-08 5.08e-08 3.62e-07 1.25e-07 3.90e-07 erg/cm2
Peak flux PL 4.31e-01 5.99e-01 6.15e-01 1.16e+00 2.01e+00 2.80e+00 ph/cm2/s
90%_error_low -1.13e-01 -1.03e-01 -7.63e-02 -2.81e-01 -2.65e-01 -3.52e-01 ph/cm2/s
90%_error_hi 1.25e-01 1.01e-01 7.59e-02 3.34e-01 2.67e-01 3.59e-01 ph/cm2/s
Fluence CPL 1.84e-07 3.47e-07 4.92e-07 1.30e-06 1.39e-06 2.32e-06 erg/cm2
90%_error_low -3.50e-08 -3.34e-08 -5.46e-08 -6.67e-07 -1.31e-07 -6.75e-07 erg/cm2
90%_error_hi 2.68e-08 3.55e-08 5.82e-08 2.21e-07 1.26e-07 3.51e-07 erg/cm2
Peak flux CPL 3.84e-01 6.00e-01 6.45e-01 8.83e-01 1.98e+00 2.51e+00 ph/cm2/s
90%_error_low -1.48e-01 -1.08e-01 -9.73e-02 -3.99e-01 -2.73e-01 -5.13e-01 ph/cm2/s
90%_error_hi 1.58e-01 1.06e-01 1.04e-01 3.77e-01 2.75e-01 4.83e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 328.3688 43.9999 0.0110 47.7285 -170.2495 2.0550801 17.597 TRIG_00208050 Foreground time interval of the image: -10.116 30.152 (delta_t = 40.268 [sec]) Background time interval of the image: -204.531 -10.116 (delta_t = 194.415 [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 -10.116 sec. to 30.152 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49938 ( -0.149719 0.148855 ) Norm@50keV : 3.65147E-03 ( -0.000304542 0.000303812 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.26 using 59 PHA bins. # Reduced chi-squared = 0.8993 for 57 degrees of freedom # Null hypothesis probability = 6.892166e-01 Photon flux (15-150 keV) in 40.27 sec: 0.455781 ( -0.04005 0.040251 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39525e-06 ( -1.24317e-07 1.24991e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.116 sec. to 30.152 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.28209 ( -0.216804 0.588526 ) Epeak [keV] : 103.255 ( -400.262 -400.262 ) Norm@50keV : 1.27031E-03 ( -0.00127008 0.000660853 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.95 using 59 PHA bins. # Reduced chi-squared = 0.8919 for 56 degrees of freedom # Null hypothesis probability = 7.020735e-01 Photon flux (15-150 keV) in 40.27 sec: 0.453874 ( -0.041982 0.041492 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38977e-06 ( -1.30575e-07 1.26207e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.376 sec. to 1.376 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.960651 ( -0.209985 0.219809 ) Norm@50keV : 1.75182E-02 ( -0.00228435 0.00224853 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.01 using 59 PHA bins. # Reduced chi-squared = 1.333 for 57 degrees of freedom # Null hypothesis probability = 4.700213e-02 Photon flux (15-150 keV) in 1 sec: 2.01336 ( -0.26496 0.26676 ) ph/cm2/s Energy fluence (15-150 keV) : 1.92163e-07 ( -2.3915e-08 2.39446e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.376 sec. to 1.376 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.619933 ( -0.441938 0.948322 ) Epeak [keV] : 260.563 ( -260.536 -260.536 ) Norm@50keV : 2.39079E-02 ( -0.00824636 0.0292633 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.48 using 59 PHA bins. # Reduced chi-squared = 1.348 for 56 degrees of freedom # Null hypothesis probability = 4.235876e-02 Photon flux (15-150 keV) in 1 sec: 1.98440 ( -0.27331 0.27489 ) ph/cm2/s Energy fluence (15-150 keV) : 1.91448e-07 ( -2.42081e-08 2.41328e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 25.628 sec. Hardness ratio (energy fluence ratio) = 1.4148487997
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.325977e-07 S(50-150 keV) = 8.626503e-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 = -1.084193585495419E+00, IMY = 1.863087079026394E-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: -204.531410 -10.116000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0740 40.9763 3.7 55.5 173.0 -2.2912 -3.2 2.2 Cyg X-3 326.1933 38.4692 4.5 43.9 -176.3 0.6152 2.6 8.9 Cyg X-2 330.4134 0.2673 3.0 19.4 120.7 0.6096 3.8 ------ UNKNOWN 7.0632 44.8275 3.4 47.1 -132.8 1.7126 3.3 ------ UNKNOWN 40.3599 -13.3735 4.2 51.9 -42.2 2.1821 2.7 ------ UNKNOWN 39.4000 -11.2282 3.7 50.6 -44.7 2.4745 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -10.116000 30.152000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1063 40.8830 8.5 55.4 172.9 -0.4333 -1.4 4.2 Cyg X-3 326.3366 38.3368 7.6 43.8 -176.3 -0.1539 -1.5 7.8 Cyg X-2 7.4713 -27.0725 2.3 32.2 -0.0 0.3697 4.9 ------ UNKNOWN 12.2701 -28.2507 2.8 35.7 -4.7 0.3336 4.1 ------ UNKNOWN 26.6375 -41.3927 2.3 53.3 -3.6 0.9066 5.0 ------ UNKNOWN 328.3688 43.9999 0.7 47.7 -170.2 2.0547 17.6 ------ UNKNOWN 36.3362 -35.4559 2.7 56.1 -14.9 1.0296 4.3 ------ UNKNOWN 34.6312 -25.8687 2.1 50.5 -24.8 0.7965 5.4 ------ UNKNOWN 347.7961 53.4649 2.0 53.3 -150.9 1.2558 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 296.868600 963.088700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5314 -40.5438 0.3 9.9 93.6 11.5521 36.5 0.7 Vela X-1 170.0642 -60.6731 11.4 37.3 124.1 -0.8936 -1.0 8.0 Cen X-3 145.4657 -30.7092 2.3 19.2 56.8 1.7826 5.0 ------ UNKNOWN 144.2321 8.7224 3.0 49.8 7.2 3.3732 3.9 ------ UNKNOWN 128.3977 -15.8792 3.5 21.7 -7.3 1.1476 3.3 ------ UNKNOWN 126.6501 19.1022 5.2 56.3 -16.5 3.3894 2.2 ------ UNKNOWN