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 18:43:56 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger344582
======================================================================
Trigger: 00344582 Segment: 000
BAT Trigger Time: 257583359.68 [s; MET]
Trigger Stop: 257583360.704 [s; MET]
UTC: 2009-03-01T06:55:55.141940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 338.14040286168 Dec: 26.6421673055728 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.68
Image Trigger?: NO
Rate S/N Ratio: 95.3362470417207 [ if not an image trigger ]
Image S/N Ratio: 21.68
Analysis Position: [ source = BAT ]
RA: 338.14040286168 Dec: 26.6421673055728 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 338.142401385022 Dec: 26.6387709636245 [deg; J2000]
{ 22h 32m 34.2s , +26d 38' 19.6" }
+/- 0.587742640300044 [arcmin] (estimated 90% radius based on SNR)
+/- 0.201897216184284 [arcmin] (formal 1-sigma fit error)
SNR: 64.9906606878297
Angular difference between the analysis and refined position is 0.230248 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 41.3720000088215 +/- 2.13565542319992
Measured from: -1.80400002002716
to: 39.5679999887943 [s; relative to TRIGTIME]
T50: 19.9240000247955 +/- 0.21203773941758
Measured from: 5.16799998283386
to: 25.0920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 23.0679999887943
to: 24.0679999887943 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.9120000004768
to: 72.2240000069141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.481978 11.189694 11.226112 4.094841
0.095828 0.109864 0.108158 0.090299 [error]
Peak 0.445632 0.761654 0.782279 0.320955
0.016758 0.021562 0.022652 0.018806 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 90.136 -17.912 72.224
T90 41.372 -1.804 39.568
T50 19.924 5.168 25.092
Peak 1.000 23.068 24.068
====== 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 -1.160 -0.028 0.028 - - - 2.60e-02 -4.11e-04 4.09e-04 28.940 57
CPL -1.103 -0.066 0.068 999.619 -999.619 -999.619 2.74e-02 -1.65e-03 1.20e-03 29.820 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 -1.090 -0.060 0.060 - - - 1.61e-01 -5.09e-03 5.08e-03 53.150 57
CPL -1.090 -0.055 0.066 9999.360 -9999.360 -9999.360 1.62e-01 -5.12e-03 5.01e-03 53.410 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 2.18e-06 4.94e-06 8.84e-06 3.73e-05 2.41e-05 5.33e-05 erg/cm2
90%_error_low -7.68e-08 -1.03e-07 -1.35e-07 -1.37e-06 -3.53e-07 -1.39e-06 erg/cm2
90%_error_hi 7.81e-08 1.03e-07 1.34e-07 1.40e-06 3.54e-07 1.42e-06 erg/cm2
Peak flux PL 1.47e-03 1.82e-02 1.80e-01 1.81e+01 9.46e-01 1.83e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 2.18e-06 4.94e-06 8.83e-06 3.74e-05 2.41e-05 5.31e-05 erg/cm2
90%_error_low N/A -9.47e-08 -1.32e-07 -4.58e-06 -3.75e-07 -4.00e-06 erg/cm2
90%_error_hi N/A 1.12e-07 1.47e-07 5.66e-07 3.60e-07 7.42e-07 erg/cm2
Peak flux CPL 4.47e+00 5.75e+00 5.41e+00 8.90e+00 1.86e+01 2.46e+01 ph/cm2/s
90%_error_low -3.05e-01 -2.33e-01 -1.91e-01 N/A -6.11e-01 -9.59e-01 ph/cm2/s
90%_error_hi 3.13e-01 2.32e-01 1.90e-01 N/A 6.14e-01 7.66e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 338.1424 26.6388 0.0030 35.3095 -61.9225 33.7913383 64.991 TRIG_00344582 Foreground time interval of the image: -17.912 62.021 (delta_t = 79.933 [sec]) Background time interval of the image: -852.379 -751.626 (delta_t = 100.753 [sec]) -239.680 -32.240 (delta_t = 207.440 [sec]) -30.680 -17.912 (delta_t = 12.768 [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 -17.912 sec. to 72.224 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16042 ( -0.0281885 0.0282893 ) Norm@50keV : 2.60302E-02 ( -0.000410704 0.000409392 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 28.94 using 59 PHA bins. # Reduced chi-squared = 0.5077 for 57 degrees of freedom # Null hypothesis probability = 9.992812e-01 Photon flux (15-150 keV) in 90.14 sec: 3.03950 ( -0.0528 0.05303 ) ph/cm2/s Energy fluence (15-150 keV) : 2.40817e-05 ( -3.53361e-07 3.5358e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.912 sec. to 72.224 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.155 ( -0.0127992 0.12095 ) Epeak [keV] : 9999.20 ( -9999.2 -9999.2 ) Norm@50keV : 2.61587E-02 ( -0.000387876 0.00247062 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 28.95 using 59 PHA bins. # Reduced chi-squared = 0.5171 for 56 degrees of freedom # Null hypothesis probability = 9.989625e-01 Photon flux (15-150 keV) in 90.14 sec: 1.05524 ( -0.098628 0.137 ) ph/cm2/s Energy fluence (15-150 keV) : 2.4084e-05 ( -3.7473e-07 3.60331e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 23.068 sec. to 24.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.0896 ( -0.0599131 0.0601893 ) Norm@50keV : 0.160880 ( -0.00508904 0.00508092 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.15 using 59 PHA bins. # Reduced chi-squared = 0.9325 for 57 degrees of freedom # Null hypothesis probability = 6.200923e-01 Photon flux (15-150 keV) in 1 sec: 0.945847 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.68784e-06 ( -5.83939e-08 5.8545e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.068 sec. to 24.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.08449 ( -0.0555535 0.0659423 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 0.161751 ( -0.0050674 0.00506023 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.38 using 59 PHA bins. # Reduced chi-squared = 0.9533 for 56 degrees of freedom # Null hypothesis probability = 5.745257e-01 Photon flux (15-150 keV) in 1 sec: 18.6374 ( -0.6112 0.6135 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 41.372 sec. Hardness ratio (energy fluence ratio) = 1.7895753529
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.120355e-06 S(50-150 keV) = 1.6961654e-05
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 = 3.333670761331051E-01, IMY = 6.249313085092625E-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: -852.379410 -751.626300 -239.680000 -32.240000 -30.680000 -17.912000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0974 40.9564 2.6 52.0 -27.5 2.7134 4.5 0.6 Cyg X-3 326.1696 38.3304 147.3 39.8 -37.6 -0.0270 -0.1 0.5 Cyg X-2 284.2822 74.4954 2.6 53.5 17.2 5.1513 4.4 ------ UNKNOWN 46.3315 -8.0134 3.0 54.0 -179.0 2.8132 3.9 ------ UNKNOWN 47.7178 -10.7624 2.6 57.1 -179.0 5.7548 4.5 ------ UNKNOWN 10.9445 -1.3094 2.5 40.9 -132.7 2.0616 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -17.912000 62.020620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.1104 40.9523 25.2 52.0 -27.5 0.4398 0.5 0.0 Cyg X-3 326.1752 38.3281 9.3 39.8 -37.6 0.5710 1.2 0.4 Cyg X-2 55.7002 49.7321 3.3 28.6 92.4 0.9878 3.5 ------ UNKNOWN 48.3945 -8.8128 4.2 55.7 179.2 2.9351 2.7 ------ UNKNOWN 22.9349 8.8580 2.8 30.6 -153.2 1.1660 4.1 ------ UNKNOWN 19.6921 -2.1126 3.1 41.3 -146.1 1.7476 3.7 ------ UNKNOWN 338.1424 26.6388 0.2 35.3 -61.9 33.7862 65.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 151.220600 961.920600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6348 22.0106 0.2 40.9 -179.4 33.9935 47.2 0.2 Crab 126.5255 59.3439 2.5 9.6 46.3 2.1301 4.6 ------ UNKNOWN 80.7427 16.2908 2.4 47.2 -178.3 4.3366 4.8 ------ UNKNOWN 301.8168 78.5655 3.2 42.0 -38.7 3.0955 3.6 ------ UNKNOWN 52.6174 19.7904 5.2 55.4 -145.2 5.9193 2.3 ------ UNKNOWN