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 Sep 10 16:58:41 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger576562
======================================================================
Trigger: 00576562 Segment: 000
BAT Trigger Time: 405209257.024 [s; MET]
Trigger Stop: 405209258.048 [s; MET]
UTC: 2013-11-03T22:07:25.793680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.954137003544 Dec: -44.6701123249379 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 7.39
Analysis Position: [ source = BAT ]
RA: 348.954137003544 Dec: -44.6701123249379 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 348.94368992268 Dec: -44.6526322497927 [deg; J2000]
{ 23h 15m 46.5s , -44d 39' 09.5" }
+/- 1.5543736740579 [arcmin] (estimated 90% radius based on SNR)
+/- 0.750907600317949 [arcmin] (formal 1-sigma fit error)
SNR: 16.1982375110888
Angular difference between the analysis and refined position is 1.139635 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 15.2079999446869 +/- 3.03467429277549
Measured from: -7.40399998426437
to: 7.80399996042252 [s; relative to TRIGTIME]
T50: 6.2399999499321 +/- 2.16173632827323
Measured from: -2.56000000238419
to: 3.67999994754791 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.611999988555908
to: 1.61199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.283999979496
to: 10.2520000338554 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.485401 0.519039 0.315917 0.020397
0.045308 0.046776 0.040822 0.036269 [error]
Peak 0.044850 0.073469 0.065530 0.004766
0.011047 0.012105 0.010866 0.008232 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 18.536 -8.284 10.252
T90 15.208 -7.404 7.804
T50 6.240 -2.560 3.680
Peak 1.000 0.612 1.612
====== 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: 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 -1.793 -0.178 0.173 - - - 4.76e-03 -5.41e-04 5.32e-04 62.450 57
CPL -1.342 -0.548 0.766 63.408 -20.269 -63.408 8.56e-03 -4.14e-03 1.46e-02 61.020 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 -1.370 -0.278 0.280 - - - 1.29e-02 -2.35e-03 2.34e-03 58.250 57
CPL -0.209 -1.155 1.620 74.815 -22.620 678.063 5.22e-02 -5.22e-02 3.19e-01 55.290 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 1.48e-07 2.28e-07 2.63e-07 5.83e-07 8.12e-07 1.22e-06 erg/cm2
90%_error_low -2.16e-08 -2.25e-08 -4.00e-08 -1.61e-07 -9.35e-08 -2.05e-07 erg/cm2
90%_error_hi 2.21e-08 2.25e-08 4.04e-08 1.98e-07 9.50e-08 2.34e-07 erg/cm2
Peak flux PL 4.69e-01 5.10e-01 3.94e-01 5.00e-01 1.56e+00 1.87e+00 ph/cm2/s
90%_error_low -1.35e-01 -1.01e-01 -8.44e-02 -1.82e-01 -2.87e-01 -3.45e-01 ph/cm2/s
90%_error_hi 1.46e-01 9.94e-02 8.36e-02 2.35e-01 2.87e-01 3.49e-01 ph/cm2/s
Fluence CPL 1.42e-07 2.42e-07 2.62e-07 2.68e-07 7.75e-07 9.13e-07 erg/cm2
90%_error_low -2.38e-08 -2.91e-08 -4.49e-08 -1.76e-07 -1.06e-07 -2.10e-07 erg/cm2
90%_error_hi 2.39e-08 3.04e-08 4.34e-08 3.78e-07 1.08e-07 4.04e-07 erg/cm2
Peak flux CPL 3.95e-01 5.80e-01 4.31e-01 1.61e-01 1.52e+00 1.57e+00 ph/cm2/s
90%_error_low -1.52e-01 -1.26e-01 -1.02e-01 -1.61e-01 -2.90e-01 -3.17e-01 ph/cm2/s
90%_error_hi 1.63e-01 1.36e-01 1.03e-01 3.46e-01 2.90e-01 3.88e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 348.9437 -44.6526 0.0119 32.9996 118.9281 1.4749042 16.198 TRIG_00576562 Foreground time interval of the image: -8.284 10.252 (delta_t = 18.536 [sec]) Background time interval of the image: -400.923 -384.995 (delta_t = 15.928 [sec]) -239.024 -8.284 (delta_t = 230.740 [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 -8.284 sec. to 10.252 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7934 ( -0.178148 0.172926 ) Norm@50keV : 4.75783E-03 ( -0.000540978 0.000532156 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.45 using 59 PHA bins. # Reduced chi-squared = 1.096 for 57 degrees of freedom # Null hypothesis probability = 2.887210e-01 Photon flux (15-150 keV) in 18.54 sec: 0.653983 ( -0.064793 0.064823 ) ph/cm2/s Energy fluence (15-150 keV) : 8.1238e-07 ( -9.35278e-08 9.498e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.284 sec. to 10.252 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34182 ( -0.548498 0.766291 ) Epeak [keV] : 63.4080 ( -20.2686 -63.4081 ) Norm@50keV : 8.55921E-03 ( -0.00413538 0.0145769 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.02 using 59 PHA bins. # Reduced chi-squared = 1.090 for 56 degrees of freedom # Null hypothesis probability = 3.002184e-01 Photon flux (15-150 keV) in 18.54 sec: 0.643217 ( -0.066618 0.066578 ) ph/cm2/s Energy fluence (15-150 keV) : 7.75174e-07 ( -1.06323e-07 1.08149e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.612 sec. to 1.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37038 ( -0.278361 0.280304 ) Norm@50keV : 1.29038E-02 ( -0.00234617 0.00234094 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.25 using 59 PHA bins. # Reduced chi-squared = 1.022 for 57 degrees of freedom # Null hypothesis probability = 4.292044e-01 Photon flux (15-150 keV) in 1 sec: 1.56125 ( -0.28664 0.28728 ) ph/cm2/s Energy fluence (15-150 keV) : 1.25476e-07 ( -2.46645e-08 2.49455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.612 sec. to 1.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.209332 ( -1.1545 1.62026 ) Epeak [keV] : 74.8150 ( -22.6205 678.063 ) Norm@50keV : 5.22049E-02 ( -0.0522047 0.319281 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.29 using 59 PHA bins. # Reduced chi-squared = 0.9873 for 56 degrees of freedom # Null hypothesis probability = 5.017364e-01 Photon flux (15-150 keV) in 1 sec: 1.52141 ( -0.28964 0.29044 ) ph/cm2/s Energy fluence (15-150 keV) : 1.16129e-07 ( -2.68128e-08 2.71789e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 15.208 sec. Hardness ratio (energy fluence ratio) = 1.15401194666
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.766308e-07 S(50-150 keV) = 4.357643e-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 = -3.141206988733403E-01, IMY = -5.683696015884775E-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: -400.923400 -384.995200 -239.024000 -8.284000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.8371 -37.8317 6.8 34.9 -83.5 0.6852 1.7 7.1 4U 1700-377 256.3281 -36.2681 6.3 35.2 -80.8 0.7810 1.9 10.6 GX 349+2 262.9832 -24.7486 5.5 37.2 -59.2 0.8026 2.1 1.4 GX 1+4 264.9453 -44.3490 5.2 26.2 -91.0 0.5857 2.2 10.6 4U 1735-44 268.3785 -1.4069 7.0 52.3 -32.5 -1.1102 -1.6 2.8 SW J1753.5-0127 270.3256 -25.0202 3.5 32.1 -51.4 0.9258 3.4 4.2 GX 5-1 270.3798 -25.7094 4.6 31.6 -52.3 0.6750 2.5 4.6 GRS 1758-258 274.0242 -14.0020 2.2 38.7 -34.8 1.5590 5.1 2.3 GX 17+2 275.9140 -30.4881 6.2 24.8 -52.5 0.4145 1.9 7.3 H1820-303 285.1133 -24.7680 9.1 24.0 -28.4 0.2621 1.3 10.1 HT1900.1-2455 288.8696 10.9543 2.7 56.8 -3.6 4.4481 4.3 4.2 GRS 1915+105 262.9710 -33.8212 2.8 31.7 -72.0 1.2440 4.2 1.2 GX 354-0 277.5613 -21.2556 2.8 30.8 -37.0 1.0061 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.284000 10.252000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.1369 -37.9541 29.8 34.6 -83.5 -0.0390 -0.4 9.7 4U 1700-377 256.4259 -36.3274 4.8 35.1 -80.8 0.2507 2.4 5.8 GX 349+2 262.8910 -24.6069 0.0 37.3 -59.1 -0.1376 -1.4 10.5 GX 1+4 264.6854 -44.5074 5.9 26.3 -91.4 -0.1231 -1.9 4.2 4U 1735-44 268.3747 -1.5241 11.3 52.2 -32.6 0.1670 1.0 4.3 SW J1753.5-0127 270.2376 -25.1649 9.9 32.1 -51.7 -0.0777 -1.2 5.7 GX 5-1 270.4334 -25.8695 4.3 31.5 -52.4 -0.1774 -2.7 10.4 GRS 1758-258 273.8696 -14.0453 7.1 38.7 -35.1 -0.1197 -1.6 7.9 GX 17+2 275.8326 -30.2613 5.1 25.0 -52.3 -0.1300 -2.3 7.9 H1820-303 285.0192 -24.7800 44.2 24.1 -28.6 -0.0126 -0.3 8.5 HT1900.1-2455 288.8477 10.9529 10.0 56.8 -3.6 0.2900 1.2 2.9 GRS 1915+105 262.9494 -33.6964 13.8 31.8 -71.9 0.0624 0.8 8.5 GX 354-0 5.4289 -51.8855 2.3 41.6 135.4 0.6437 5.0 ------ UNKNOWN 348.9437 -44.6526 0.7 33.0 118.9 1.4754 16.2 ------ UNKNOWN 270.4531 -85.0188 1.7 41.3 -164.3 0.4947 6.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.676600 398.278700 398.976000 783.028000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 53.3126 -54.7472 2.6 41.3 168.1 2.2498 4.5 ------ UNKNOWN 319.1877 5.0619 2.4 56.4 3.8 7.3511 4.7 ------ UNKNOWN 314.6398 1.4730 2.3 55.3 -3.0 5.3051 4.9 ------ UNKNOWN 19.2017 -73.2867 2.6 31.8 -155.8 1.4599 4.4 ------ UNKNOWN 297.9804 -5.7961 3.4 58.9 -24.3 6.8862 3.4 ------ UNKNOWN