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 17:26:56 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger349931
======================================================================
Trigger: 00349931 Segment: 000
BAT Trigger Time: 262064121.444 [s; MET]
Trigger Stop: 262064121.508 [s; MET]
UTC: 2009-04-22T03:35:16.764880 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 294.756100929833 Dec: 40.3842290518036 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 7
Analysis Position: [ source = BAT ]
RA: 294.756100929833 Dec: 40.3842290518036 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 294.743911193011 Dec: 40.3965434901325 [deg; J2000]
{ 19h 38m 58.5s , +40d 23' 47.6" }
+/- 1.8815490267443 [arcmin] (estimated 90% radius based on SNR)
+/- 0.811997662561176 [arcmin] (formal 1-sigma fit error)
SNR: 12.3297231247078
Angular difference between the analysis and refined position is 0.925330 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 8.47600001096725 +/- 0.381764329779977
Measured from: -0.26800000667572
to: 8.20800000429153 [s; relative to TRIGTIME]
T50: 7.47600001096725 +/- 5.53747958421237
Measured from: 0.0839999914169312
to: 7.56000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.372000008821487
to: 0.627999991178513 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.392000019550323
to: 8.49599999189377 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.143956 0.127819 0.103164 0.044286
0.019264 0.019752 0.017516 0.015413 [error]
Peak 0.055026 0.073015 0.070125 0.017513
0.007169 0.007515 0.007033 0.005472 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 8.888 -0.392 8.496
T90 8.476 -0.268 8.208
T50 7.476 0.084 7.560
Peak 1.000 -0.372 0.628
====== 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 -1.679 -0.295 0.283 - - - 2.88e-03 -4.74e-04 4.54e-04 51.680 57
CPL -1.710 -0.267 0.405 9999.360 -9999.350 -9999.360 2.82e-03 N/A N/A 51.740 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 -1.301 -0.172 0.173 - - - 1.43e-02 -1.46e-03 1.46e-03 57.760 57
CPL -0.981 -0.303 0.766 160.432 -160.432 -160.432 2.08e-02 -7.70e-03 2.88e-02 57.090 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 3.86e-08 6.36e-08 7.95e-08 1.97e-07 2.37e-07 3.79e-07 erg/cm2
90%_error_low -8.82e-09 -8.90e-09 -1.83e-08 -8.14e-08 -4.09e-08 -9.97e-08 erg/cm2
90%_error_hi 9.17e-09 8.88e-09 1.82e-08 1.15e-07 4.18e-08 1.27e-07 erg/cm2
Peak flux PL 4.86e-01 5.50e-01 4.47e-01 6.05e-01 1.70e+00 2.09e+00 ph/cm2/s
90%_error_low -8.63e-02 -6.25e-02 -5.53e-02 -1.41e-01 -1.76e-01 -2.22e-01 ph/cm2/s
90%_error_hi 9.06e-02 6.17e-02 5.47e-02 1.66e-01 1.76e-01 2.25e-01 ph/cm2/s
Fluence CPL 3.51e-08 4.60e-08 4.62e-08 1.06e-07 1.59e-07 2.36e-07 erg/cm2
90%_error_low -1.20e-08 -1.36e-08 -1.64e-08 N/A -4.48e-08 -9.00e-08 erg/cm2
90%_error_hi 1.04e-08 1.24e-08 1.10e-08 N/A 3.58e-08 4.03e-08 erg/cm2
Peak flux CPL 4.60e-01 5.69e-01 4.60e-01 4.11e-01 1.68e+00 1.90e+00 ph/cm2/s
90%_error_low -1.02e-01 -7.24e-02 -6.12e-02 -2.20e-01 -1.81e-01 -2.92e-01 ph/cm2/s
90%_error_hi 1.03e-01 7.57e-02 6.33e-02 2.45e-01 1.80e-01 3.21e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 294.7439 40.3965 0.0157 21.3905 -79.6823 0.4333063 12.330 TRIG_00349931 Foreground time interval of the image: -0.392 8.496 (delta_t = 8.888 [sec]) Background time interval of the image: -239.444 -0.392 (delta_t = 239.052 [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 -0.392 sec. to 8.496 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.67905 ( -0.294626 0.282721 ) Norm@50keV : 2.87645E-03 ( -0.000474163 0.000453746 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.68 using 59 PHA bins. # Reduced chi-squared = 0.9067 for 57 degrees of freedom # Null hypothesis probability = 6.742088e-01 Photon flux (15-150 keV) in 8.888 sec: 0.379287 ( -0.053041 0.053065 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37156e-07 ( -4.08767e-08 4.18376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 8.496 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.67925 ( -0.268924 0.403676 ) Epeak [keV] : 1.00000E+04 ( -9999.99 -10000 ) Norm@50keV : 2.88046E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.69 using 59 PHA bins. # Reduced chi-squared = 0.9231 for 56 degrees of freedom # Null hypothesis probability = 6.384815e-01 Photon flux (15-150 keV) in 8.888 sec: 0.379312 ( -0.05277 0.053011 ) ph/cm2/s Energy fluence (15-150 keV) : 1.58717e-07 ( -4.48095e-08 3.57979e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.372 sec. to 0.628 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30087 ( -0.172083 0.173281 ) Norm@50keV : 1.42748E-02 ( -0.00146283 0.00145866 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.76 using 59 PHA bins. # Reduced chi-squared = 1.013 for 57 degrees of freedom # Null hypothesis probability = 4.470572e-01 Photon flux (15-150 keV) in 1 sec: 1.70331 ( -0.17593 0.1761 ) ph/cm2/s Energy fluence (15-150 keV) : 1.41049e-07 ( -1.61497e-08 1.62877e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 0.628 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.980722 ( -0.302657 0.76596 ) Epeak [keV] : 160.432 ( -160.455 -160.455 ) Norm@50keV : 2.07574E-02 ( -0.00769513 0.0288224 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.09 using 59 PHA bins. # Reduced chi-squared = 1.019 for 56 degrees of freedom # Null hypothesis probability = 4.344870e-01 Photon flux (15-150 keV) in 1 sec: 1.68450 ( -0.18085 0.1804 ) ph/cm2/s Energy fluence (15-150 keV) : 1.37585e-07 ( -1.80486e-08 1.77717e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.476 sec. Hardness ratio (energy fluence ratio) = 1.24916543017
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0226784e-07 S(50-150 keV) = 1.3488539e-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 = 7.015688471606696E-02, IMY = 3.853698884002041E-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: -239.444000 -0.392000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5309 35.3511 7.9 12.4 139.9 0.2730 1.5 3.6 Her X-1 268.3829 -1.4396 6.8 34.9 38.4 0.5054 1.7 1.2 SW J1753.5-0127 274.0040 -14.0360 8.7 47.7 30.6 0.9861 1.3 0.1 GX 17+2 288.7641 10.9564 0.8 28.7 -6.2 2.8908 14.2 2.1 GRS 1915+105 299.5872 35.2053 0.3 25.0 -66.0 8.5609 36.2 0.3 Cyg X-1 308.1765 41.0625 4.4 31.6 -78.7 0.8168 2.6 7.2 Cyg X-3 231.2929 20.5267 3.3 36.0 115.6 1.5512 3.5 ------ UNKNOWN 255.4201 7.5872 3.0 28.9 66.3 1.2001 3.9 ------ UNKNOWN 270.4597 3.3046 2.5 30.1 34.5 1.1389 4.5 ------ UNKNOWN 217.6351 52.9853 2.6 41.3 171.0 1.4114 4.4 ------ UNKNOWN 319.9033 62.9160 3.0 43.0 -112.2 3.2976 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.392000 8.496000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3488 35.4643 6.3 12.5 140.4 -0.0584 -1.8 9.0 Her X-1 268.4125 -1.5502 3.6 35.0 38.3 0.1770 3.2 6.4 SW J1753.5-0127 274.1412 -14.1256 6.7 47.8 30.4 0.2162 1.7 9.5 GX 17+2 288.7671 10.9460 26.6 28.7 -6.2 0.0155 0.4 1.8 GRS 1915+105 299.8094 35.1235 0.0 25.1 -65.8 0.0556 1.4 11.7 Cyg X-1 308.1292 40.9170 8.5 31.5 -78.4 0.0725 1.4 2.3 Cyg X-3 209.6112 45.9004 2.5 46.5 160.8 0.3238 4.6 ------ UNKNOWN 266.8997 9.1547 2.1 24.4 42.6 0.2157 5.5 ------ UNKNOWN 204.3335 67.8298 2.3 50.0 -169.8 0.3308 5.0 ------ UNKNOWN 294.7439 40.3966 0.9 21.4 -79.7 0.4334 12.3 ------ UNKNOWN 258.5004 72.8842 2.1 39.9 -148.2 0.2608 5.4 ------ UNKNOWN 296.7044 67.0470 2.6 37.2 -126.0 0.2308 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.256590 962.632500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5191 35.3671 12.8 31.9 107.0 -0.8887 -0.9 3.4 Her X-1 288.8000 10.9366 0.7 29.9 24.6 10.2510 15.8 0.5 GRS 1915+105 299.5861 35.2015 0.2 6.4 -25.2 32.5421 66.6 0.2 Cyg X-1 308.1078 40.9896 1.5 10.2 -84.9 3.8908 7.6 2.2 Cyg X-3 326.1938 38.2926 7.7 24.3 -82.5 1.1022 1.5 2.0 Cyg X-2 275.5612 33.3766 3.0 16.8 84.4 2.1593 3.9 ------ UNKNOWN 277.5287 55.5176 2.7 18.9 161.8 2.2072 4.3 ------ UNKNOWN 199.8665 78.6819 2.9 51.5 178.4 5.8691 4.0 ------ UNKNOWN 135.8655 80.4408 2.9 58.6 -171.1 15.9320 4.0 ------ UNKNOWN 116.1237 87.0853 3.0 52.5 -167.2 6.1130 3.9 ------ UNKNOWN 51.3122 83.1585 3.9 53.0 -159.4 4.5827 2.9 ------ UNKNOWN 336.9942 59.6214 3.3 32.4 -127.8 2.6084 3.5 ------ UNKNOWN