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 15:22:50 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger214805
======================================================================
Trigger: 00214805 Segment: 000
BAT Trigger Time: 171981829.76 [s; MET]
Trigger Stop: 171981830.784 [s; MET]
UTC: 2006-06-14T12:43:48.504600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 320.86249529876 Dec: -53.034119723373 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.45
Image Trigger?: NO
Rate S/N Ratio: 68.3885955404847 [ if not an image trigger ]
Image S/N Ratio: 18.45
Analysis Position: [ source = BAT ]
RA: 320.86249529876 Dec: -53.034119723373 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 320.875176367126 Dec: -53.0260861931081 [deg; J2000]
{ 21h 23m 30.0s , -53d 01' 33.9" }
+/- 0.903491612900429 [arcmin] (estimated 90% radius based on SNR)
+/- 0.382501394688967 [arcmin] (formal 1-sigma fit error)
SNR: 35.1628376245641
Angular difference between the analysis and refined position is 0.664616 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 109.104000002146 +/- 3.37283737294577
Measured from: 0.332000017166138
to: 109.436000019312 [s; relative to TRIGTIME]
T50: 43.2360000312328 +/- 0.772155427209394
Measured from: 21.1159999966621
to: 64.352000027895 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.32400000095367
to: -0.324000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.49599999189377
to: 179.080000013113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.977030 14.255113 7.805486 1.689761
0.120756 0.124966 0.107231 0.081957 [error]
Peak 0.309654 0.492137 0.363293 0.109238
0.021436 0.025371 0.023206 0.016656 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 180.576 -1.496 179.080
T90 109.104 0.332 109.436
T50 43.236 21.116 64.352
Peak 1.000 -1.324 -0.324
====== 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: CPL)
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 -2.037 -0.037 0.037 - - - 1.24e-02 -2.09e-04 2.09e-04 48.380 57
CPL -2.225 -0.229 0.025 98.520 -3.531 59.765 1.03e-02 -1.68e-03 2.56e-04 35.780 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 -1.598 -0.104 0.102 - - - 8.95e-02 -5.44e-03 5.42e-03 52.440 57
CPL -1.382 -0.269 0.430 147.910 -67.123 -147.910 1.15e-01 -2.93e-02 7.06e-02 51.600 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 4.76e-06 6.31e-06 6.16e-06 1.07e-05 2.08e-05 2.80e-05 erg/cm2
90%_error_low -1.79e-07 -1.30e-07 -1.32e-07 -5.45e-07 -3.51e-07 -5.93e-07 erg/cm2
90%_error_hi 1.82e-07 1.30e-07 1.32e-07 5.65e-07 3.51e-07 6.03e-07 erg/cm2
Peak flux PL 4.05e+00 3.84e+00 2.54e+00 2.61e+00 1.15e+01 1.30e+01 ph/cm2/s
90%_error_low -4.08e-01 -2.44e-01 -1.93e-01 -3.84e-01 -7.04e-01 -7.70e-01 ph/cm2/s
90%_error_hi 4.21e-01 2.43e-01 1.92e-01 4.20e-01 7.05e-01 7.71e-01 ph/cm2/s
Fluence CPL 5.04e-06 5.85e-06 5.09e-06 9.72e-06 1.88e-05 2.73e-05 erg/cm2
90%_error_low -2.11e-07 -3.10e-07 -6.12e-07 -2.48e-06 -1.33e-06 -4.93e-06 erg/cm2
90%_error_hi 2.18e-07 3.28e-07 6.89e-07 1.77e-06 1.46e-06 1.05e-06 erg/cm2
Peak flux CPL 3.88e+00 3.92e+00 2.60e+00 2.06e+00 1.14e+01 1.25e+01 ph/cm2/s
90%_error_low -5.00e-01 -2.80e-01 -2.19e-01 -7.20e-01 -7.26e-01 -1.07e+00 ph/cm2/s
90%_error_hi 5.11e-01 2.86e-01 2.23e-01 6.83e-01 7.29e-01 1.09e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 320.8752 -53.0261 0.0055 44.1310 34.1709 7.4414648 35.163 TRIG_00214805 Foreground time interval of the image: -1.496 14.941 (delta_t = 16.437 [sec]) Background time interval of the image: -239.760 -1.496 (delta_t = 238.264 [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 -1.496 sec. to 179.080 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.03655 ( -0.0367046 0.0365574 ) Norm@50keV : 1.24314E-02 ( -0.000209102 0.000209085 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.38 using 59 PHA bins. # Reduced chi-squared = 0.8488 for 57 degrees of freedom # Null hypothesis probability = 7.848226e-01 Photon flux (15-150 keV) in 180.6 sec: 1.89689 ( -0.04454 0.04494 ) ph/cm2/s Energy fluence (15-150 keV) : 2.07538e-05 ( -3.50655e-07 3.50801e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.496 sec. to 179.080 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.33242 ( -0.105842 0.148298 ) Epeak [keV] : 134.112 ( -39.0985 24.1974 ) Norm@50keV : 9.47830E-03 ( -0.000861786 0.00107307 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 33.99 using 59 PHA bins. # Reduced chi-squared = 0.6069 for 56 degrees of freedom # Null hypothesis probability = 9.912074e-01 Photon flux (15-150 keV) in 180.6 sec: 1.83976 ( -0.07162 0.07295 ) ph/cm2/s Energy fluence (15-150 keV) : 1.88286e-05 ( -1.33147e-06 1.45556e-06 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -1.324 sec. to -0.324 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.59796 ( -0.10353 0.10219 ) Norm@50keV : 8.94811E-02 ( -0.00544234 0.00542329 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.44 using 59 PHA bins. # Reduced chi-squared = 0.9201 for 57 degrees of freedom # Null hypothesis probability = 6.464515e-01 Photon flux (15-150 keV) in 1 sec: 11.4918 ( -0.7037 0.7048 ) ph/cm2/s Energy fluence (15-150 keV) : 8.37163e-07 ( -5.42022e-08 5.44163e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.324 sec. to -0.324 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38245 ( -0.269338 0.429706 ) Epeak [keV] : 147.910 ( -67.1274 -147.914 ) Norm@50keV : 0.114506 ( -0.0292836 0.0705796 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.60 using 59 PHA bins. # Reduced chi-squared = 0.9214 for 56 degrees of freedom # Null hypothesis probability = 6.420733e-01 Photon flux (15-150 keV) in 1 sec: 11.3880 ( -0.7259 0.7292 ) ph/cm2/s Energy fluence (15-150 keV) : 8.27504e-07 ( -5.76648e-08 5.73263e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 109.104 sec. Hardness ratio (energy fluence ratio) = 0.870542377426
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0886427e-05 S(50-150 keV) = 7.912057e-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 = 8.026413408118448E-01, IMY = -5.448789100544709E-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: -239.760000 -1.496000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.2800 38.3693 9.4 50.3 -171.2 0.4745 1.2 5.8 Cyg X-2 300.0699 -29.6653 2.8 39.4 76.0 2.4648 4.2 ------ UNKNOWN 28.8172 -50.6670 2.8 57.8 -15.9 3.1134 4.1 ------ UNKNOWN 29.8613 -28.4624 3.4 52.1 -42.2 3.0662 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.496000 14.940590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.2619 38.3674 8.9 50.3 -171.2 -0.1299 -1.3 5.1 Cyg X-2 297.0859 21.6184 3.6 51.1 149.6 0.7025 3.2 ------ UNKNOWN 320.8752 -53.0261 0.3 44.1 34.2 7.4416 35.2 ------ UNKNOWN 303.5568 4.8176 2.8 37.1 133.4 0.4816 4.1 ------ UNKNOWN 349.8328 32.6791 2.5 45.2 -145.0 0.3397 4.6 ------ UNKNOWN 6.8129 23.4731 2.2 44.9 -120.1 0.8123 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 80.340590 482.320000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.7984 -44.4279 13.8 36.9 69.3 1.9539 0.8 2.7 4U 1735-44 276.1027 -30.4229 15.0 39.4 96.1 -2.4561 -0.8 9.8 H1820-303 285.0043 -25.0440 10.3 38.7 111.2 -2.9865 -1.1 7.6 HT1900.1-2455 264.4403 -59.0110 2.6 31.1 45.3 5.4591 4.3 ------ UNKNOWN 217.8149 -71.2094 2.3 44.5 15.7 8.3265 5.0 ------ UNKNOWN 320.9232 -53.0304 1.6 0.1 -122.1 5.1790 7.2 ------ UNKNOWN 250.2160 -85.8225 4.1 35.7 -4.2 2.7881 2.9 ------ UNKNOWN 47.5577 -83.2779 2.3 37.1 -22.1 4.9517 5.1 ------ UNKNOWN 11.7357 -30.1810 2.2 43.2 -112.1 14.3766 5.2 ------ UNKNOWN