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 21:05:27 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger333320
======================================================================
Trigger: 00333320 Segment: 000
BAT Trigger Time: 247232795.2 [s; MET]
Trigger Stop: 247232795.456 [s; MET]
UTC: 2008-11-01T11:46:31.979160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 95.8265748344563 Dec: -0.0822079532699427 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.53
Image Trigger?: NO
Rate S/N Ratio: 28.1780056072107 [ if not an image trigger ]
Image S/N Ratio: 11.53
Analysis Position: [ source = BAT ]
RA: 95.8265748344563 Dec: -0.0822079532699427 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 95.8345010494422 Dec: -0.104849436558215 [deg; J2000]
{ 06h 23m 20.3s , -00d 06' 17.5" }
+/- 1.7319386987136 [arcmin] (estimated 90% radius based on SNR)
+/- 0.69879226567323 [arcmin] (formal 1-sigma fit error)
SNR: 13.8789829567745
Angular difference between the analysis and refined position is 1.439327 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 0.180000007152557 +/- 0.042520585314364
Measured from: 0.0160000026226044
to: 0.196000009775162 [s; relative to TRIGTIME]
T50: 0.0879999995231628 +/- 0.0200000166893085
Measured from: 0.0720000267028809
to: 0.160000026226044 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.387999981641769
to: 0.612000018358231 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.219999998807907 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018346 0.038698 0.041203 0.010372
0.003746 0.004787 0.004665 0.003443 [error]
Peak 0.021107 0.047949 0.050620 0.010743
0.006979 0.007627 0.006903 0.005900 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.220 0.000 0.220
T90 0.180 0.016 0.196
T50 0.088 0.072 0.160
Peak 1.000 -0.388 0.612
====== 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: 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 -1.070 -0.200 0.204 - - - 3.09e-02 -4.12e-03 4.12e-03 66.830 57
CPL 0.254 -0.936 1.189 91.241 -21.100 88.374 1.34e-01 -8.53e-02 3.24e-01 60.600 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 -1.142 -0.270 0.276 - - - 8.65e-03 -1.46e-03 1.46e-03 69.350 57
CPL 0.535 -1.317 1.938 82.798 -19.298 95.948 5.10e-02 -5.10e-02 2.82e-01 64.250 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 5.82e-09 1.39e-08 2.65e-08 1.23e-07 7.19e-08 1.70e-07 erg/cm2
90%_error_low -1.30e-09 -2.07e-09 -4.06e-09 -3.51e-08 -1.06e-08 -3.86e-08 erg/cm2
90%_error_hi 1.37e-09 2.05e-09 4.03e-09 4.30e-08 1.06e-08 4.53e-08 erg/cm2
Peak flux PL 2.53e-01 3.15e-01 2.86e-01 4.50e-01 1.01e+00 1.30e+00 ph/cm2/s
90%_error_low -7.47e-02 -6.24e-02 -5.44e-02 -1.53e-01 -1.74e-01 -2.31e-01 ph/cm2/s
90%_error_hi 8.24e-02 6.15e-02 5.39e-02 1.96e-01 1.74e-01 2.39e-01 ph/cm2/s
Fluence CPL 4.54e-09 1.60e-08 3.03e-08 2.97e-08 6.80e-08 8.05e-08 erg/cm2
90%_error_low -1.56e-09 -2.62e-09 -5.07e-09 -1.69e-08 -1.11e-08 -1.95e-08 erg/cm2
90%_error_hi 1.63e-09 2.72e-09 5.25e-09 4.49e-08 1.12e-08 4.36e-08 erg/cm2
Peak flux CPL 1.68e-01 3.45e-01 3.34e-01 1.30e-01 9.44e-01 9.78e-01 ph/cm2/s
90%_error_low -8.93e-02 -7.68e-02 -6.87e-02 -8.15e-02 -1.82e-01 -2.04e-01 ph/cm2/s
90%_error_hi 1.02e-01 7.69e-02 7.17e-02 1.97e-01 1.82e-01 2.49e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 95.8345 -0.1048 0.0139 26.1701 66.0786 0.1144589 13.879 TRIG_00333320 Foreground time interval of the image: 0.000 0.220 (delta_t = 0.220 [sec]) Background time interval of the image: -239.200 0.000 (delta_t = 239.200 [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 0.000 sec. to 0.220 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06982 ( -0.200171 0.203647 ) Norm@50keV : 3.09313E-02 ( -0.00411603 0.00411582 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.83 using 59 PHA bins. # Reduced chi-squared = 1.173 for 57 degrees of freedom # Null hypothesis probability = 1.750087e-01 Photon flux (15-150 keV) in 0.22 sec: 3.57806 ( -0.48076 0.48109 ) ph/cm2/s Energy fluence (15-150 keV) : 7.1856e-08 ( -1.05528e-08 1.06267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.220 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.253556 ( -0.935963 1.1892 ) Epeak [keV] : 91.2407 ( -21.0997 88.3744 ) Norm@50keV : 0.134134 ( -0.0852731 0.32405 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.60 using 59 PHA bins. # Reduced chi-squared = 1.082 for 56 degrees of freedom # Null hypothesis probability = 3.135248e-01 Photon flux (15-150 keV) in 0.22 sec: 3.50760 ( -0.48614 0.48581 ) ph/cm2/s Energy fluence (15-150 keV) : 6.80225e-08 ( -1.10503e-08 1.11844e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.388 sec. to 0.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14223 ( -0.269689 0.276382 ) Norm@50keV : 8.65152E-03 ( -0.00146113 0.00146083 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.35 using 59 PHA bins. # Reduced chi-squared = 1.217 for 57 degrees of freedom # Null hypothesis probability = 1.263718e-01 Photon flux (15-150 keV) in 1 sec: 1.00802 ( -0.173787 0.17432 ) ph/cm2/s Energy fluence (15-150 keV) : 8.92833e-08 ( -1.64282e-08 1.66201e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 0.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.535234 ( -1.31741 1.93754 ) Epeak [keV] : 82.7978 ( -19.2982 95.9479 ) Norm@50keV : 5.10026E-02 ( -0.0510023 0.281892 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.25 using 59 PHA bins. # Reduced chi-squared = 1.147 for 56 degrees of freedom # Null hypothesis probability = 2.098547e-01 Photon flux (15-150 keV) in 1 sec: 0.944265 ( -0.182404 0.182275 ) ph/cm2/s Energy fluence (15-150 keV) : 8.18333e-08 ( -1.70519e-08 1.76706e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.18 sec. Hardness ratio (energy fluence ratio) = 1.89535327809
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.051376e-08 S(50-150 keV) = 4.750866e-08
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 = 1.992596715391991E-01, IMY = -4.492014886940798E-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: -239.200000 0.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5256 -40.5548 0.4 44.6 -33.8 10.9291 29.9 0.1 Vela X-1 100.2705 35.9513 2.1 39.2 132.8 2.1536 5.3 ------ UNKNOWN 127.8902 -51.2528 2.4 53.8 -23.7 2.5189 4.7 ------ UNKNOWN 148.9791 -41.6236 2.6 50.3 -45.3 3.7996 4.4 ------ UNKNOWN 153.3337 -32.8253 2.5 46.0 -56.6 3.6229 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 0.220000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.2844 -40.6743 0.0 44.7 -33.5 -0.0199 -2.0 13.2 Vela X-1 81.5817 -29.8362 2.5 50.1 28.0 0.1220 4.6 ------ UNKNOWN 95.8345 -0.1049 0.8 26.2 66.1 0.1144 13.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 980.900600 1055.682400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4955 -40.5505 1.2 34.3 138.4 3.7998 10.0 1.5 Vela X-1 170.4640 -60.7438 15.5 8.8 88.0 0.1742 0.7 8.5 Cen X-3 186.6516 -62.8090 2.8 8.0 32.0 0.9377 4.1 2.3 GX 301-2 255.9792 -37.8676 252.0 50.5 -34.3 0.0373 0.0 1.4 4U 1700-377 256.4460 -36.4503 77.0 51.7 -35.2 -0.1336 -0.1 1.7 GX 349+2 264.7040 -44.4312 8.3 50.7 -22.2 -0.8024 -1.4 2.0 4U 1735-44 281.1253 -61.8242 2.3 46.8 3.8 2.2399 4.9 ------ UNKNOWN 262.9143 -61.3925 2.8 39.8 -3.7 1.3110 4.1 ------ UNKNOWN 163.3376 -25.8402 2.8 32.6 -170.8 0.9817 4.1 ------ UNKNOWN 151.3213 -5.5852 2.6 55.6 -175.8 4.7632 4.5 ------ UNKNOWN 247.9761 -52.6281 2.5 37.0 -22.3 1.3422 4.6 ------ UNKNOWN 230.9992 -27.9788 3.0 43.6 -64.6 4.0927 3.9 ------ UNKNOWN